• Title/Summary/Keyword: 초음파 검사시스템

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Development of Mobile Robot Systems for Automatic Diagnosis of Boiler Tubes in Fossil Power Plants and Large Size Pipelines (화력발전소 보일러 튜브 및 대형 유체수송관 자동 진단을 위한 이동로봇 시스템 개발)

  • Park, Sang-Deok;Jeong, Hee-Don;Lim, Zhong-Soo
    • Journal of the Korean Society for Nondestructive Testing
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    • v.22 no.3
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    • pp.254-260
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    • 2002
  • In this study, two types of mobile robotic systems using NDT (Non-destructive testing) method are developed for automatic diagnosis of the boiler tubes and large size pipelines. The developed mobile robots crawl the outer surface of the tubes or pipelines and detect in-pipe defects such as pinholes, cracks and thickness reduction by corrosion and/or erosion using EMAT (Electro-magnetic Acoustic Transducer). Automation of fault detection by means of mobile robotic systems for these large-scale structures helps to prevent significant troubles without danger of human beings under harmful environment.

A Study on Compressive Strength Estimation of Underwater Concrete Structures According to Water Depths (수중 콘크리트 구조물의 수심별 강도 추정에 관한 연구)

  • Lee, Jisung;Han, Sanghun;Park, Seunghee
    • KSCE Journal of Civil and Environmental Engineering Research
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    • v.36 no.3
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    • pp.341-348
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    • 2016
  • Harbor facilities require long-term durability and safety, and also maintain the performance requirement until the durability life. However, existing harbor facilities are becoming superannuated with durable years and durability is declined by erosion of the sea and damage from sea. In addition, harbor facilities will be in demand for the expansion of harbor and offshore structures with rising economic power by enhancement of domestic industry and increase of import and export. Therefore, in this study, two kinds of nondestructive test (NDT) techniques (schmidt rebound hammer and ultrasonic sensor) are verified for the effective maintenance of underwater concrete structures including harbor facilities. Sea field applicability of Schmidt hammer and ultrasonic sensor was verified by comparing field test result with sea field test result and also deduced the compressive strength estimation equation by depth of the water. On the basis of the sea field test result, compressive strength estimation equation which was deduced by multiple regression analysis indicated highest accuracy compared to other equations, especially it will be more likely to be used in underwater because of the depth of water correction. In the future, if schmidt hammer and ultrasonic sensor which were invented as waterproofing are used with ROV (Remotely Operated Vehicle), it will be possible to make a diagnosis of high reliability for underwater concrete structures and set up a ubiquitous concept of NDT system.

A Study on Measurement of Internal Defects of Pressure Vessel by Digital Shearography(I) (전자 전단 간섭법을 이용한 압력용기의 내부결함 측정에 관한 연구(I))

  • Kang, Young-June;Park, Nak-Kyu;Ryu, Won-Jae;Kim, Kyung-Suk
    • Journal of the Korean Society for Nondestructive Testing
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    • v.22 no.4
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    • pp.393-401
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    • 2002
  • Pipelines in power plants, nuclear facilities and chemical industries are often affected by corrosion effects. It is important to inspect the internal defects in pipelines in oder to guarantee safe operational condition. We have taken relatively much time, cost and manpower to use conventional NDT methods because these methods are contact measuring methods. In this paper, we used digital shearography, a laser-based optical method which allows full-field measurement of surface displacement derivatives. This method has many advantages in practical use, such as low sensitivity to environmental noise, simple optical configuration and real time measurement. The experiment was performed with pressure vessels which has different internal cracks and detected internal cracks in the pressure vessels at a real time using phase shifting method.

A development of remote controlled mobile robot working in a hazard environment (위해환경에서 구동가능한 원격제어 이동 로봇 개발)

  • 박제용;최현석;현웅근
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2002.11a
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    • pp.457-461
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    • 2002
  • This paper describes a development of a robot working in hazard environment. The developed robot consists of robot controller with vision system and host PC program. The robot and camera can move with 2 degree of freedom by independent remote controlling a user friendly designed joystick. An environment is recognized by the vision system and ultra sonic sensors. The visual image and command data translated through 900MHz and 447MHz RF controller, respectively. To show the validity of the developed system, operations of the robot in the field area were illustrated.

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Effects of Rubber Loading on the Ultrasonic Backward Radiation Profile of Leaky Lamb Wave (고무 접합이 후방복사된 리키 램파 프로파일에 미치는 영향)

  • Song, Sung-Jin;Kwon, Sung-Duk;Jung, Min-Ho;Kim, Young-H.
    • Journal of the Korean Society for Nondestructive Testing
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    • v.22 no.5
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    • pp.508-515
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    • 2002
  • The characterization of adhesive property in multi-layer materials has been hot issue for a long time. In order to evaluate adhesive properties, we constructed fully automated system for the backward radiation of leaky Lamb wave. The backward radiation profiles were obtained for the bare steel plate and plates with rubber-loading. The rf waveforms and frequency spectra of backward radiation show the characteristics of involved leaky Lamb wave modes. As the thickness of rubber-loading increased, the amplitude of profile at the incident angle of $13.4^{\circ}$ exponentially decreased. Scanning the incident position over the partially rubber-loaded specimen shows good agreement with the actual rubber-loading. The backward radiation of leaky Lamb wave has great potential to evaluate the adhesive condition as well as material properties of plates.

A Study on the Design of Intelligent Classifier for Decision of Quality of Barrier Material (차단물질 특성 판정을 위한 지능형 분류기 설계에 관한 연구)

  • Kim, Sung-Ho;Yun, Seong-Ung
    • Journal of the Korean Institute of Intelligent Systems
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    • v.18 no.2
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    • pp.230-235
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    • 2008
  • Recently, LG chemical corporation developed new material called HYPERIER, which has an excellent barrier characteristic. It has many layers which are made of nano-composite within LDPE(Low-Density Poly Ethylene). In order to guarantee the quality of the final product from the production line, a certain test equipment is required to investigate the existence of layers inside the HYPERIER. In this work, ultrasonic sensor based test equipment for investigating the existence of inner layers is proposed. However, it is a tedious job for human operators to check the existence by just looking at the resounding waveform from ultrasonic sensor. Therefore, to enhance the performance of the ultrasonic test equipment, Fast Fourier Transform(FFT) and Principle Components Analysis(PCA) and Back-Propagation Neural Network(BPNN) are utilized which is used for classification of Quality. To verily the feasibility of the proposed scheme, some experiments are executed.

Recent Research Trend in Lateral Flow Immunoassay Strip (LFIA) with Colorimetric Method for Detection of Cancer Biomarkers (암 바이오마커 검출용 비색법 기반 측면 흐름 면역 크로마토그래피 분석법(LFIA) 스트립의 최신 연구 동향)

  • Lee, Sooyoung;Lee, Hye Jin
    • Applied Chemistry for Engineering
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    • v.31 no.6
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    • pp.585-590
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    • 2020
  • Successful early diagnosis of cancer diseases such as lung, prostate, liver and adrenocortical carcinoma is a key step in determining the cost of treatment, survival rate, and cure rate. Most of current cancer diagnosis systems including biopsy, computed tomography (CT), positron emission tomography (PET)-CT, magnetic resonance imaging (MRI), ultrasonography, etc., require expensive and complicated equipment with highly trained human resources. Global medical and scientific communities have thus made numerous efforts on developing effective but rapid disease management system via introducing a wide spectrum of point-of-care medical diagnosis devices. Among them, a lateral flow immunoassay strip technique has gained a great attention due to many advantages such as cost-effectiveness, short inspection time, and user friendly accessibility. In this mini-review, we will highlight recent research trend on the development of colorimetry based LFIA strips for cancer diagnosis and discuss the future research direction and potential applications.

Extraction of Tongue Region for Heart Disease Diagnosis Using (심장질환진단을 위한 혀 영역 추출)

  • Cho, Dong-Uk;Kim, Bong-Hyun;Lee, Se-Hwan
    • Annual Conference of KIPS
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    • 2005.11a
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    • pp.655-658
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    • 2005
  • 질병과 관련된 인간의 노력은 병의 치료보다는 몸의 이상 유무를 빠르게 진단하는 것과 이를 통한 예방에 초점을 맞춰져 있다. 이를 위해 혈액과 소변 검사등과 같은 검사부터 시작해서 초음파와 CT등 다양한 진단 기기가 발전되어 왔다. 그러나 인체는 스스로 자신의 질병 유무에 대한 인체의 생체 신호를 몸밖에 나타내게 되어 있다. 이를 해독하여 질병을 진단하는 것이 한방에서 주로 사용하는 방법이다. 따라서 본 논문에서는 한의학에 있어서 생체 신호를 해석하는 4대 질환 진단 방법 중 가장 중요한 망진(望診)에 대해 기술하고자 한다. 특히, 인체의 중심 기관인 심장에 대해 망진을 IT기술로 구현하고자 한다. 심장은 오관중 혀와 관계가 되어 있으며 따라서 심장에 대한 인간 생체 신호 해석시 혀는 중요한 분석 기관이 된다. 이를 위해 혀를 통해 인간의 생체 신호에 대한 결과를 반영하여 심장의 질환 여부에 대한 정보를 제공하여 주는 설진 시스템을 구축하고자 하며 우선적으로 본 논문은 얼굴 영상에서 혀 영역을 추출하는 방법에 대해 제안하고자 하며 실험에 의해 제안한 방법의 유용성을 입증하고자 한다.

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GMR Sensor Applicability to Remote Field Eddy Current Defect Signal Detection in a Ferromagnetic Pipe (강자성 배관의 원격장 와전류 결함 신호 검출에 GMR Sensor의 적용성 연구)

  • Park, Jeong Won;Park, Jae Ha;Song, Sung Jin;Kim, Hak Joon;Kwon, Se Gon
    • Journal of the Korean Society for Nondestructive Testing
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    • v.36 no.6
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    • pp.483-489
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    • 2016
  • The typical methods used for inspecting ferromagnetic pipes include the ultrasonic testing (UT) contact method and the following non-contact methods: magnetic flux leakage (MFL), electromagnetic acoustic transducers (EMAT), and remote field eddy current testing (RFECT). Among these methods, the RFECT method has the advantage of being able to establish a system smaller than the diameter of a pipe. However, the method has several disadvantages as well, including different sensitivities and difficult-to-repair coil sensors which comprise its array system. Therefore, a giant magneto-resistance (GMR) sensor was applied to address these issues. The GMR sensor is small, easy to replace, and has uniform sensitivity. In this experiment, the GMR sensor was used to measure remote field and defect signal characteristics (in the axial and radial directions) in a ferromagnetic pipe. These characteristics were measured in an effort to investigate standard defects at changing depths within a pipe. The results show that the experiment successfully demonstrated the applicability of the GMR sensor to RFECT signal detection in ferromagnetic pipe.

National Health Insurance System of Korea: Resource-Based Relative Value Scale and a New Healthcare Policy (우리나라의 건강보험 수가 시스템: 상대가치 그리고 새로운 건강보험 보장성 강화 대책)

  • Joon-Il Choi
    • Journal of the Korean Society of Radiology
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    • v.81 no.5
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    • pp.1024-1037
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    • 2020
  • The resource-based relative value scale (RBRVS) compares the value of a medical practice to the consumption of resources, which consist of the work of the physician, practice expenses, and professional liability insurance. At the time of the 2nd revision of RBRVS, the fee for radiological examinations had been reduced due to the high preservation rate. In RBRVS, practice expenses account for most of the compensation of radiological examinations, and physicians' work is relatively undervalued. A new healthcare policy (Moon Jae-In care) consists of the expansion of the National Health Insurance (NHI) coverage, reduction of patient charges for the vulnerable class, and support for catastrophic medical expenses. However, Moon Jae-In care is expected to negatively affect the NHI in Korea financially. The expansion of the insurance coverage for ultrasonography and MRI examinations is a significant part of the Moon Jae-In care, and radiological societies should establish fair compensations for physicians' work within the field of radiology while implementing the Moon Jae-In care.