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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Nondestructive Testing
Journal Basic Information
Journal DOI :
The Korean Society for Nondestructive Testing
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Volume & Issues
Volume 25, Issue 6 - Dec 2005
Volume 25, Issue 5 - Oct 2005
Volume 25, Issue 4 - Aug 2005
Volume 25, Issue 3 - Jun 2005
Volume 25, Issue 2 - Apr 2005
Volume 25, Issue 1 - Feb 2005
Selecting the target year
Estimation of Natural frequencies in Osteoporotic Mouse Femur: A finite Element Analysis and a Vibration Test
Kim, Yoon-Hyuk ; Byun, Chang-Hwan ; Oh, Taek-Yul ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 239~246
In this study, a finite element analysis and a vibration test were performed to estimate the natural frequencies of mouse femurs with osteoporosis. Three groups of the femurs include the osteoporotic group, the treated group and the normal group. For the finite element analysis, the micro finite element model of the femur was reconstructed using the Micro-CT images and the Voxel mesh generation algorithm. In the vibration test, the natural frequencies were measured by the mobility test. from the results, the averaged natural frequencies in the osteoporotic group were the highest, followed by those in the treated group. The finite element models were validated within 15% errors by comparing the natural frequencies in the finite element analysis with those in the vibration test. The developed Micro-CT system, the Yokel mesh generation algorithm, the presented finite element analysis, and vibration test could be useful for the investigation of the structural change of the bone tissue, and the diagnosis and the treatment in the osteoporosis.
Foot/Ankle Roll-Over Characteristics According to Different Heel Heights of Shoe during Walking
Kim, Young-Ho ; Choi, Hue-Seok ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 247~253
This study investigated the effects on foot and ankle roll-over characteristics according to different heel heights during walking. Fifteen female volunteers who have neither musculoskeletal nor foot problems were participated in gait analyses, wearing four different pairs of shoes in different heel heights. To obtain roll-over shape of foot/ankle complex, we used trajectories of knee and ankle joints as well as the renter of pressure between initial contact and opposite initial contact. Results revealed that the entire roll-over shape moved distally as the heel height increased but roll-over characteristics showed uniformly with different heel heights. In addition, we found that nondisablea persons automatically adapted to their foot/ankle complex to varying heel heights within 6cm, by moving the origin of roll-over shape distally to maintain roll-over characteristics. However, since the balance of the gait only by the ankle joint could not be achieved beyond the heel height of 6cm, compensations at the knee and the hip joints occurred simultaneously. Roll-over characteristics in human walking would provide simpler and wider understanding of human walking, and furthermore could be applied to the wide understanding of prosthetics and orthotics of the lower extremity as well as orthopaedic shoes.
A Study of the Internal and External Morphology in the Mandibular first Premolar of the Middle-Aged Korean Using a Microcomputed Tomography
Chun, K.J. ; Lee, H.J. ; Lee, Jong-Yeop ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 254~261
Dental statistics for Koreans are far from complete and the majority of previous researches have adopted techniques such as radiological analysis and sectioning of teeth for morphological information, which are time-consuming, less accurate and destructive. Thus, a new nondestructive method is necessary to get precise dental standardization data for Koreans. For the above purpose, each of the first premolars was scanned by a micro-CT (SkyScan, Belgium) with a resolution of
at an interval of 0.022mm along the plane horizontally parallel to an occlusion plane. Internal and external morphological sections were measured and compared to the values in the average tooth size table for permanent teeth presented by G. V Black.
Effect of Epidural Block under General Anesthesia on Pulse Transit Time
Choi, Byeong-Cheol ; Kim, Seong-Min ; Jung, Dong-Keun ; Kim, Gi-Ryon ; Lee, He-Jeong ; Jeon, Gey-Rock ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 262~267
Epidural block under general anesthesia has been widely used to control postoperative pain. In this anesthetic state many hemodynamic parameters are changed. Moreover pulse transit time is influenced by this memodynamic change. m change in the finger and the toe due to relaxation of arterial wall muscle after general anesthesia and epidural block under general anesthesia. This study, in the both general anesthesia and epidural block under general anesthesia,
of the toe and of the finger are measured. In addition,
(toe-finger) of the epidural block under general anesthesia and of the general anesthesia were compared.
An Implementation of ARM 920T Processor-based Ultrasonic Spirometer and Improvement of Its Sensitivity
Lee, Cheul-Won ; Kim, Young-Kil ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 268~273
The spirometer is a medical device that measures the instantaneous velocity of the respiratory gas flow capacity. It is used for testing the condition of the lung and patient monitoring. It measures the absolute capacity difference that includes the flow capacity signal. In this paper, by using an ultrasound sensor that reduce+ the error caused by the inertia and pressure it has improved the transmission and receiving signal. This has enabled patients with weak respiratory to use the spirometer. Also, by using the ARM 920T Processor, a precise and prompt detection system was implemented.
Acoustic Emission Characteristics during fracture Process of Glass Fiber/Aluminum Hybrid Laminates
Woo, Sung-Choong ; Choi, Nak-Sam ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 274~286
Fracture behaviors and acoustic emission (AE) characteristics of single-edge-notched monolithic aluminum plates and glass fiber/aluminum hybrid laminate plates have been investigated under tensile loads. AE signals from monolithic aluminum could be classified into two different types: signals with low frequency band and high frequency band. High frequency signals were detected in the post stage of loading beyond displacement of 0.45mm. For glass fiber/aluminum laminates, AE signals with high amplitude and long duration were additionally confirmed on FFT frequency analysis, which corresponded to macro-crack propagation and/or delamination between A1 and fiber layers. On the basis of the above AE analysis and fracture observation with optical microscopy and ultrasonic T scan, characteristic features of AE associated with fracture processes of single-edge-notched glass fiber/aluminum laminates were elucidated according to different fiber ply orientations.
Non-contact Ultrasonic Technique for the Evaluation Wall Thinning of the Plate
Park, Ik-Keun ; Kim, Hyun-Mook ; Kim, Tae-Hyung ; Kim, Yong-Kwon ; Cho, Yong-Sang ; Song, Won-Joon ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 287~293
Ultrasonic guided waves are gaining increasing attention for the inspection of platelike and rodlike structures. At the same time, inspection methods that do not require contact with the test piece are being developed for advanced applications. This paper capitalizes on recent advances in the areas of guided wave ultrasonics and noncontact ultrasonics to demonstrate a superior method for the nondestructive detection of defects thinning simulating hidden corrosion in thin aluminum plates. The proposed approach uses EMAT(electro-magnetic acoustic transducer) for the noncontact generation and detection of guided waves. Interesting features in the dispersive behavior of selected guided modes are used for the detection of plate thinning. It is shown that mode cutoff measurements provide a qualitative detection of defects thinning. Measurement of the mode group velocity can be also used to quantify depth thinning.
Intercomparisonn of Techniques for Pressure Tube Inspection of Pressurized heavy Water Reactor
Lee, Hee-Jong ; Kim, Yong-Si ; Yoon, Byung-Sik ; Lee, Young-Ho ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 294~303
This paper describes the analysis results of a series f Round-Robin test that was performed to intercompare inspection and diagnosis techniques for characterization of pressure tube f a pressurized heavy water reactor under the Coordinated Research Project(CRP) of IAEA's nuclear Power Programme. For this test, six nations, Korea, Canada, India, Argentina, Rumania, and China that currently have pressurized heavy water reactors under operation involved, and the "KOR-1" pressure tube sample prepared by Korea was used. Two kinds of NDE technique, ultrasonic and eddy current test, were applied for these tests. The "KOR-1" pressure tube sample contains total 12 artificial flaws such as crack-like EDM notches, wear that is similar to the real flaws and can be produced on the pressure tubes during plant operation. Test results showed that seven laboratories from six nations detected all twelve flaws in "KOR-1" specimen by using ultrasonic and eddy current test methods, and ultrasonic test method was more accurate than eddy current test method in flaw detectin and sizing. ID flaws in pressure tube sample were more easily detected and accurately sized than OD flaws.
A Study on TOFD Inspection Using Phased Array Ultrasonic Technique
Yoon, Byung-Sik ; Kim, Yong-Si ; Lee, Hee-Jong ; Lee, Young-Ho ;
Journal of the Korean Society for Nondestructive Testing, volume 25, issue 4, 2005, Pages 304~310
The techniques in order to measure the depth of defect in weldment and structure accurately have been developed. Many researches have made efforts to develop the methods for the accurate depth sizing of defect. TOFD is known as the most accurate method of various methods for measuring depth sizing. However, there is a possibility to miss defects because of the limitation of beam coverage for the ultrasound incident angle. In this study, the results for detectability and depth sizing using phased array ultrasonic technique for thick body were compared with those of conventional TOFD technique. It was experimentally confirmed that the phased array ultrasonic TOFD technique gives good detectability and accurate depth measurement for the various types of defects. The phased array ultrasonic TOFD technique developed in this study will contribute to increase the inspection reliability in thick component such as the pressure vessel of power generation industry.