• The Journal of the Korea Contents Association
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• v.11 no.8
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• pp.198-203
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• 2011

The BMD difference depending on QCT and QUS, whose usages are recently being increased for the test of BMD, was accessed for 106 subjects of a general health examination who were aged between 24~69 year-old and results were derived as follows. The measured value of BMD by QCT and QUS showed significant correlation in general (p>0.05). In terms of the difference generated between the measurement methods depending on sexes, the female subjects showed significantly low T-score in the test made through QUS (p<0.05). Depending on ages, there was T-score difference among the subjects aged more than 40 year-old within significant range (p<0.05). When it came to the effect depending on heights and on weights, no group showed significant difference and in a group with less than 22.9 of BMI value, the T-score was measured significantly low when testing it through QCT while other groups were not affected by any testing methods. Likewise, it may require a different measurement method when it comes to the measurement of bone mineral density depending on sex, age, height, and BMI among patients. Thus, it suggests obtaining accurate data by conducting various testing methods in case of a special occasion.

• 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.