• Korean Journal of Optics and Photonics
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• v.15 no.1
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• pp.68-73
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• 2004

Flexure measurement of ring laser gyro was investigated by using an interferometer. A two-beam interferometer of Fiezo-fringe pattern obtained the flexure angle in 1-gravity acceleration and the higher acceleration environments. These environments were made with the addition of dummy mass to the ring laser gyro axis. The flexure angle change for 1-gravity acceleration change was measured as 2.37 arcsec/g with low repeatability error of 0.01 arcsec/g. The laser navigation system consisting of 3 flexure-reduced ring laser gyros showed the improvement of flexure error.

• The Research Journal of the Costume Culture
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• v.12 no.2
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• pp.249-261
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• 2004

This research proves the ROM method (Range Of Motion), which has already been used in other countries, that measures the capacity of exercise and the adaptation of movement of functional garments for special purpose due to change of the height of basic sleeve sloper. Basically, the ultimate goal of the research is to improve the functional pattern design. Firstly, this research proves the proper application of ROM that is used for the evaluation of fitting test. Therefore, according to this research, the company is able to produce the sample that is appropriate to the various purpose for women garments and betters the evaluation of function of garments. Moreover, it suggests that the evaluation of fitting test satisfies the consumers who desire to try better garments and contributes to the competitions among the companies that bring more improvements to the fashion design.

• Journal of KSNVE
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• v.9 no.3
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• pp.621-628
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• 1999

The fundamental dynamic properties of the planar electric charged particle are investigated experimentally. The experiment is conducted using electric charged spheres(4 table tennis balls with conductive surfaces) suspended by insulating strings to cancel the gravitational force. The measurements of the equilibrium angles and the natural frequencies of oscillation agree well with the analytical predictions with some error, respectively.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.19 no.1
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• pp.63-70
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• 1983

Recently, many studies for developing the underwater welding techniques have been carried out in the advanced countries as a manufacturing process and a repairing method according as a great deal of interest in development for various marine industrial fields has been gradually increased. But no study on such underwater welding is available at present in our country. In this study, underwater welding was carried out for welding of domestic structural steel plates (SM41A) of 10 mm thickness, using six types of domestic coated arc welding electrodes on a self-made gravity type underwater welding device, resulting in investigation for the underwater weldability of the domestic structural steel plates as well as for the underwater welding properties and practicability of the domestic welding electrodes.

• Journal of Korea Entertainment Industry Association
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• v.13 no.5
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• pp.239-246
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• 2019

This study aims to examine the correlation between pectoralis minor, shoulder mobility, and neck range of motion on rounded shoulder posture for Life-care increase in Women university student. The 80 female adults with rounded shoulder posture were selected for this study. Measurements of shoulder height were obtained by measuring the rounded shoulder posture using a caliper. To measure the length of pectoralis minor, a tape measure was used to measure from the point where the 4th rib and sternum meets to the inferior medial side of coracoid process. Shoulder mobility was measured by holding fists in both hands, then raising one side of the elbow until the palm on that side can be placed on the back, while lowering the other side of the elbow until the back of the hand on that side can be placed on the back. Neck range of motion was used to measure the neck movement including the flexion and the extension, lateral flexion to the right or to the left, and rotation to the right or to the left. The results of this study showed that there are significant negative correlations between pectoralis minor index, shoulder mobility, and neck range of motion in rounded shoulder posture(p<0.05). From these results, in female students with rounded shoulder, the lateral flexion of the neck to the left decreased as the left shoulder mobility increased, the neck extension decreased as the right pectoralis minor shortened, and the rotation of the neck to the left decreased as the left shoulder mobility increased.