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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Nondestructive Testing
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Journal DOI :
The Korean Society for Nondestructive Testing
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Volume & Issues
Volume 31, Issue 6 - Dec 2011
Volume 31, Issue 5 - Oct 2011
Volume 31, Issue 4 - Aug 2011
Volume 31, Issue 3 - Jun 2011
Volume 31, Issue 2 - Apr 2011
Volume 31, Issue 1 - Feb 2011
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Analysis on Femoral Neck Fractures Using Morphological Variations
Lee, Ho-Sang ; Park, Byoung-Keon ; Chae, Je-Wook ; Kim, Jay-Jung ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 459~465
It has been reported that the femoral morphology has a major correlation to femoral neck fractures(FNF). Previous studies to analyze these correlations have relied on mechanical testing and finite element methods. However, these methods have not been widely applied to various femur samples and models. It is because of the availability of the samples from both patients and cadavers, and also of the geometric limitations in changing the shape of the models. In this study we analyzed femoral neck fractures using a parameterized femoral model that could provide flexibility in changing the geometry of the model for the wide applications of FNF analysis. With the parameterization a variety of models could be generated by changing four major dimensions: femoral head diameter(FHD), femoral neck diameter(FND), femoral neck length(FNL), and neck-shaft angle(NSA). We have performed FEA on the models to compute the stress distributions and reaction forces, and compare them with the data previously generated from mechanical testing. The analysis results indicate that the FND is significantly related with the FNF and the FHD is not significantly related with the FNF.
Endoscopic Bio-Imaging Using Optical Coherence Tomography
Ahn, Yeh-Chan ; Brenner, Matthew ; Chen, Zhongping ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 466~471
Optical coherence tomography(OCT) is an emerging medical diagnostic tool that draws great attention in medical and biological fields. It has a 10-100 times higher spatial resolution than that of the clinical ultrasound but lower imaging depth such as 1-2 mm. In order to image internal organs, OCT needs an endoscopic probe. In this paper, the principle of Fourier-domain optical coherence tomography with high-speed imaging capability was introduced. An OCT endoscope based on MEMS technology was developed. It was attached to the Fourier-domain OCT system to acquire three-dimensional tomographic images of gastrointestinal tract of New Zealand white rabbit. The endoscope had a two-axis scanning mirror that was driven by electrostatic force. The mirror stirred an incident light to sweep two-dimensional plane by scanning. The outer diameter of the endoscope was 6 mm and the mirror diameter was 1.2 mm. A three-dimensional image rendered by 200 two-dimensional tomographs with
pixels was displayed within 3.5 seconds. The spatial resolution of the OCT system was 8
Analysis of Golf Swing Motion and Applied Loads on the Human Body Using Soft-
Kwak, Ki-Young ; So, Ha-Ju ; Kim, Sung-Hyeon ; Kim, Nam-Gyun ; Kim, Dong-Wook ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 472~478
The purpose of this study was to analyze the kinetic effect of Soft-
instrument on the human body structure. To analyze the kinetic effect of Soft-
instrument, Golf swing using Soft-
instrument and regular golf instrument was captured. And then Upper limbs and lumbar joint torques was calculated via computer simulation. Five man participated this study. Subjects performed golf swing using a regular golf and Soft-
instrument. Golf swing motion was captured using three position sensor, active infrared LED maker and force plate. Golf swing model was generated and simulated using ADAMS/LifeMOD program. As a results, joint torque during Soft-golf swing were lower than regular golf swing. Thus soft-golf swing have joint load lower than regular golf swing and contribute to reduce joint injury.
Influence of Inlet Secondary Curvature on Hemodynamics in Subject-Specific Model of Carotid Bifurcations
Lee, Sang-Wook ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 479~486
In image-based CFD modeling of carotid bifurcation hemodynamics, it is often not possible (or at least not convenient) to impose measured velocity profiles at the common carotid artery inlet. Instead, fully-developed velocity profiles are usually imposed based on measured flow rates. However, some studies reported a pronounced influence of inflow boundary conditions that were based on actual velocity profiles measured by magnetic resonance imaging which showing the unusual presence of a high velocity band in the middle of the vessel during early diastole inconsistent with a Dean-type velocity profile. We demonstrated that those velocity profiles were induced by the presence of modest secondary curvature of the inlet and set about to test whether such more "realistic" velocity profiles might indeed have a more pronounced influence on the carotid bifurcation hemodynamics. We found that inlet boundary condition with axisymmetric fully-developed velocity profile(Womersley flow) is reasonable as long as sufficient CCA inlet length of realistic geometry is applied.
Quantitative Alpha Fetoprotein Detection with a Piezoelectric Microcantilever Mass Sensor
Lee, Sangk-Yu ; Cho, Jong-Yun ; Lee, Yeol-Ho ; Jeon, Sang-Min ; Cha, Hyung-Joon ; Moon, Wonk-Yu ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 487~493
Alpha fetoprotein(AFP), which is serological marker for hepatocellular carcinoma, was quantitatively measured by its normal concentration, 10 ng/ml, with a label-free piezoelectric microcantilever mass sensor. The principle of detection is based on changes in the resonant frequency of the piezoelectric microcantilever before and after target molecules are attached to it, and its resonant frequency is measured electrically using a conductance spectrum. The resonant frequency of the developed sensor is approximately 1.34 MHz and the mass sensitivity is approximately 175 Hz/pg. The sensor has high reliability as mass sensor by reducing the effect of surface stress on resonant frequency due to attached proteins. 'Dip and dry' technique was used to react the sensor with reagents for immobilizing AFP antibody on the sensor and detecting AFP antigen. The measured mass of the detected AFP antigen was 6.02 pg at the concentration of 10 ng/ml, and 10.67 pg at 50 ng/ml when the immunoreaction time was 10 min.
Biomechanical Analysis and Evaluation Technology Using Human Multi-Body Dynamic Model
Kim, Yoon-Hyuk ; Shin, June-Ho ; Khurelbaatar, Tsolmonbaatar ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 494~499
This paper presents the biomechanical analysis and evaluation technology of musculoskeletal system by multi-body human dynamic model and 3-D motion capture data. First, medical image based geometric model and material properties of tissue were used to develop the human dynamic model and 3-D motion capture data based motion analysis techniques were develop to quantify the in-vivo joint kinematics, joint moment, joint force, and muscle force. Walking and push-up motion was investigated using the developed model. The present model and technologies would be useful to apply the biomechanical analysis and evaluation of human activities.
Analysis of Fracture Signals from Tooth/Composite Restoration According to AE Sensor Attachment
Gu, Ja-Uk ; Choi, Nak-Sam ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 500~507
Acoustic emission(AE) signals during the polymerization shrinkage of composite resin subjected to the LED light exposure were detected through a wave guide method and a direct sensor attachment method. For PMMA, human tooth, stainless steel substrate, data of AE hits and amplitudes were compared. For the test using the wave guide, AE amplitudes decreased because of the attenuant wave. However, AE hits and 1st peak frequency distribution were not different according to the sensor attachments. Through the experiments, wave guide could be used for a nondestructive evaluation of the marginal disintegrative fracture of dental restoration.
Feasibility Study on Detection of Crack in Bovine Incisor Using Active Thermography
Kim, Woo-Jae ; Yang, Seung-Yong ; Kim, No-Hyu ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 508~515
Bovine incisor was investigated using active infrared thermography(IRT) to visualize crack on bovine teeth. An artificial crack was carefully created in bovine incisor sample by compression load of universal tensile machine. While applying a sinusoidal heat wave to the cracked bovine incisor through halogen lamp, consecutive digital infrared images was captured from the sample surface at a frequency synchronized with heat excitation. Phase information of thermal image was calculated by four-point correlation method and processed to produce the phase image of bovine incisor. This phase image showed clearly the crack on the incisor, which was hardly detected in traditional passive thermography.
Characterization of Frequency Separation in Polymer Membranes Mimicking a Human Auditory System
Song, Won-Joon ; Bae, Sung-Jae ; Kim, Wan-Doo ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 516~521
The basilar membrane, an important functional part of the cochlea, is responsible for spectral separation of vibration signals transmitted from the stapes. In current study, scaled-up polymer membranes designed by mimicking the human basilar membrane were used for investigation of the frequency-separation characteristic. Displacement field formed on each polymer membrane was acquired by Laser Doppler scanning vibrometer and post-processed frequency-wise. The locations of the maximum displacement along the centerline were identified and collected for individual frequency range to produce the frequency-position map of individual polymer membrane. The influences of the membrane thickness and material properties on the variation of the frequency separability were discussed.
Fabrication of Biomimetic MEMS Acoustic Sensor and Analysis of Its Frequency Characteristics
Hur, Shin ; Jung, Young-Do ; Lee, Young-Hwa ; Song, Won-Joon ; Kim, Wan-Doo ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 522~528
Artificial basilar membranes made of PVDF(polyvinylidene fluoride) are manufactured using microfabrication processes. The mechanical behavior of PVDF artificial basilar membrane was measured to evaluate its performance as a mechanical frequency analyzer using scanning LDV(laser Doppler vibrometer). The experimental setup consists of the microfabricated artificial basilar membrane, a loud speaker connected to an amplifier for generating acoustic pressure of specific spectral pattern, and a scanning LDV with controlling unit for measuring the displacement of the membrane on the incoming acoustic stimulation. The microfabricated artificial basilar membrane was attached tightly upon a package containing a chamber which can be filled with silicone oil before placed on the experimental setup stage. The experiment results showed that the microfabricated artificial basilar membrane has a property as a mechanical frequency analyzer.
Evaluation of Acoustic Emission Signals Characteristics of Post Weld Heat Treated Multi-Pass Weld Block for SA-516 Pressure Vesssel Steel
Na, Eui-Gyun ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 529~535
In this study, evaluation of acoustic emission signals characteristics for the post weld heat treated (PWHT) multi-pass weldment and weldment was dealt. Charpy standard specimens were taken from the lowest, middle and highest regions of the weld block. Pre-crack was made using the repeated load. Four point bend and AE tests were conducted simultaneously. Regardless of the specimens, AE signals were absent within elastic region and produced in the process of plastic deformation. AE signals for all specimens were not emitted after the maximum load. Value of signal strength for the all PWHT specimens was lower than that of the weldment. Besides, relations of plastic deformation zone size and accumulated AE counts for the PWHT specimens were more simple compared with the weldment. In case of the PWHT specimen, particles on the fractured surface decreased prominently compared with the weldment due.to PWHT. From these results, it can be concluded that PWHT was effective in reducing the AE sources for the weldment.
Ultrasonic Transducer Design for the Axial Flaw Detection of Dissimilar Metal Weld
Yoon, Byung-Sik ; Kim, Yong-Sik ; Yang, Seung-Han ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 536~542
Dissimilar metal welds in nuclear power plant are known as very susceptible to PWSCC flaws, and periodically inspected by the qualified inspector and qualified procedure during in-service inspection period. According to field survey data, the majority of their DMWs are located on tapered nozzle or adjacent to a tapered component. These types of configurations restrict examination access and also limit examination volume coverage. Additionally, circumferential scan for axially oriented flaw is very difficult to detect located on tapered surface because the transducer can't receive flaw response from reflector for miss-orientation. To overcome this miss-orientation, it is necessary adapt skewed ultrasonic transducer accomodate tapered surface. The skewed refracted longitudinal ultrasonic transducer designed by modeling and manufactured from the modelling result for axial flaw detection. Experimental results showed that the skewed refracted longitudinal ultrasonic transducer get higher flaw response than non-skewed refracted longitudinal ultrasonic transducer.
A Study on the Profile Change Measurement of Steam Generator Tubes with Tube Expansion Methods
Kim, Young-Kyu ; Song, Myung-Ho ; Choi, Myung-Sik ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 543~551
Steam generator tubes for nuclear power plants contain the local shape transitions on their inner or outer surface such as dent, bulge, over-expansion, eccentricity, deflection, and so on by the application of physical force during the tube manufacturing and steam generator assembling and by the sludge (that is, corrosion products) produced during the plant operation. The structural integrity of tubes will be degraded by generating the corrosive crack at that location. The profilometry using the traditional bobbin probes which are currently applied for measuring the profile change of tubes gives us basic information such as axial locations and average magnitudes of deformations. However, the three-dimensional quantitative evaluation on circumferential locations, distributional angle, and size of deformations will have to be conducted to understand the effects of residual stresses increased by local deformations on corrosive cracking of tubes. Steam generator tubes of Korean standard nuclear power plants expanded within their tube-sheets by the explosive expansion method and suffered from corrosive cracks in the early stage of power operation. Thus, local deformations of steam generator tubes at the top of tube-sheet were measured with an advanced rotating probe and a laser profiling system for the two cases where the tubes expanded by the explosive expansion method and hydraulic expansion. Also, the trends of eccentricity, deflection, and over-expansion of tubes were evaluated. The advanced eddy current profilometry was confirmed to provide accurate information of local deformations compared with laser profilometry.
Development of a Multichannel Eddy Current Testing Instrument(II)
Lee, Hee-Jong ; Nam, Min-Woo ; Cho, Chan-Hee ; Yoo, Hyun-Joo ; Kim, In-Chel ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 552~559
Recently, the eddy current testing(ECT), alternating current field testing, magnetic flux leakage testing and remote field testing have been used as a nondestructive evaluation method based on the electromagnetic induction phenomenon. The eddy current testing is now widely accepted as a NDE method for the heat exchanger tube in the electric power industry, chemical, shipbuilding, and military. The ECT system mainly consists of the synthesizer module, analog module, analog-to-digital converter, power supplier, and data acquisition and analysis program. In the previous study, the synthesizer module and the analog module which is essential to the ECT system were primarily developed, and in this study the data acquisition and analysis program were developed. The operation system for this program is based on the Windows 7, and optimized for the Korean users, and the specific feature of this program using setup wizard enables inspector to make a setup easily for acquisition and analysis of ECT data. In this paper, the configuration and functions of eddy current data acquisition and analysis program will be introduced.
Nondestructive Testing Using Lock-in Shearography
Kim, Kyeong-Suk ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 560~566
Research Trend on Acoustic Emission Technology
Yoon, Dong-Jin ; Han, Byeong-Hee ;
Journal of the Korean Society for Nondestructive Testing, volume 31, issue 5, 2011, Pages 567~571