• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.56 no.7
• /
• pp.1339-1342
• /
• 2007

In this study, we determined the optimum electrode pair for measuring the abdominal pressure using bio-impedance method and compared with conventional methods. Because impedance changes differ from a weight, a height, contractile force, volume of muscle and blood other or whatever of individuals, it was quantified using values of impedance change, correlation coefficient and SNR. Our results showed the optimum electrode pair (1, 9) which could detect impedance changes due to an increase of the intensity of the abdominal pressure. The correlation coefficient and quadratic function between the RMS values of EMG and the impedance changes were 0.87 and $y=0.0014x^2+0.0620x+0.6958$, respectively. It demonstrated that the abdominal pressure could be measured noninvasively and simply using bio-impedance method. We propose that this optimum electrode configuration would be useful for future studies involving the convenient measurement of abdominal pressure by ambulatory urodynamics monitoring study.

• Journal of Korean Ophthalmic Optics Society
• /
• v.10 no.2
• /
• pp.133-138
• /
• 2005

As Aspheric lenses have producted to development for disadvantage of spherical lenses, the purpose of use on aspheric lenses is in improvement of the imaging quality and decrement of the number of lenses used, they are used for lessen the mass and volume in optical science. The skills to produce optical data and the aspheric are seen as high technology today. The optical science which is composed of aspheric provides broadening view of things and high efficiency. In addition, it provides many advantages such as providing image and reducing the weight. Now, I study with techniques of processing and measuring aspheric to satisfy the necessity of increasing in aspheric data. Furthermore. I emphasize that the techniques of producing, measuring, and evaluating in the aspheric lenses have constantly developing today.

• Journal of the Korean Society of Manufacturing Process Engineers
• /
• v.11 no.1
• /
• pp.46-49
• /
• 2012

Gears are reliable and efficient power transmission elements. They have been widely used in all kinds of machinery. Nowadays, resource conservation energy conservation environmental improvements from the request of the compact, light weight, high efficiency, low cost Higher efficiency is required. Tooth root and bottom profiles of cylindrical gears affect bending fatigue life, but they are hard to measure with conventional gear measuring machine(GMM), because GMM is normally customized to measure only gear working flanks. The authors try to develop a new type of GMM by installing an extra 3D scanning probe and control software to measure tooth root and bottom profiles. First, in order to measure in various directions, a 3D scanning probe has been attached to the GMM developed. Next, calibration algorithm has been developed. Deviations of the calibration results are measured and it is found that systematic error must be caused by heat from driving motors. A new alternative GMM with driving motors generating less heat was designed and two GMMs are compared. Finally, 3 Dimension measurement of tooth root and bottom profiles of cylindrical gears is described.

• Journal of the Korean Society of Costume
• /
• v.14
• /
• pp.199-208
• /
• 1990

In order to eximine the body form of the physically handicapped people, the 11 items of angle, 54 items of size and weight of the subjects were measured body silhouetter photographs and with the Martin's anthrophometeric instrument respectively. The subjects were consist of 37 boy students who are 13-19 years old and hemiplegias caused by cerebral palsy. And then the comparison between normal and paralysis sides, analysis of somatotypes with the body silhouetter photographs, ANOVA for effect of somatotype on measuring items for angles, and factor analysis for all items were carried out. The results were as follows: 1. The results of measuring are difference between normal and paralysis sides. 2. The items shown significant differences between normal and paralysis sides are diagonal anterior chest B, scapula length, armscye girth, diagonal posterior chest A, and arc of the bust. 3. The percentage of each somatotype shows the order of bending somatotype, turning over somatotype, turning over-bending somatotype, and standard somatotype in the upper body. There are significant differences between somatotypes and sternalis up, sternalis down, scapula, vertebialis, ${\alpha}$, and ${\beta}$ angles respectively. 4. From the result of factor analysis, front and back sections, length items of the upper part and the lower part from the bust line, and the upper size items at the bottom of armscye were abstracted.

• Korea-Australia Rheology Journal
• /
• v.16 no.4
• /
• pp.163-168
• /
• 2004

In this study, an ultrasonic technique was employed to obtain pressure-volume-temperature (PVT) rela­tionship of polymer melt by measuring ultrasonic velocities under various temperatures and pressures. The proposed technique was applied to on-line monitoring of injection molding process as an attempt to predict quality of molded parts. From the comparison based on Tait equation, it was confirmed that the PVT behav­ior of a polymer is well described by the variation of ultrasonic velocities measured within the polymer medium. In addition, the changes in part weight and moduli were successfully predicted by combining the data collected from ultrasonic technique and artificial neural network algorithm. The results found from this study suggest that the proposed technique can be effectively utilized to monitor the evolution of solid­ification within the mold by measuring ultrasonic responses of various polymers during injection molding process. Such data are expected to provide a critical basis for the accurate prediction of final performance of molded parts.

• The Korean Journal of Food And Nutrition
• /
• v.11 no.6
• /
• pp.657-661
• /
• 1998

Green tea powder (3%, 6%, 9%) was added to green tea bread and physicochemical characteristics of green tea bread were investigated. As the result of measuring the pH of the dough, the pH of control was 5.6 and the pH of the investigated. As the result of measuring the pH of the dough, the pH of control was 5.6 and the pH of the samples were 5.34, 5.29 and 5.26 each. As it is seen above, there is no big difference in the pH of the three different dough. Therefore, it could be that the pH of the dough doesn't really affect on the volume of the bread. As the amount of the green powder was changed, the weight of bread, volume of bread, baking loss rate, the color of the surface, the tenderness of the crumb were affected. The 9% of the green powder gave the most distinguishable affect on these factors. As the amount of thee green tea green tea powder caused the change of color. The result of the sensory evaluation showed that the addition of the green tea powder affected significantly on the quality of the bread. Considering the result of the test, 3% of the green tea powder bread is the best for the production of the bread.

• Progress in Superconductivity
• /
• v.13 no.3
• /
• pp.195-202
• /
• 2012

In this paper, we designed Active Magnetic Bearing (AMB) for large scale Superconductor Flywheel Energy Storage System (SFESS) and PD controller for AMB. And we experimentally evaluated SFESS including hybrid type AMB. The radial AMB was designed to provide force slew rate that was sufficient for the unbalance disturbances at the maximum operating speed. The thrust AMB is a hybrid type where a permanent magnet carries the weight of the flywheel and an electromagnetic actuator generates the dynamic control force. We evaluated the design performance of the manufactured AMB through comparison of FEM analysis and the results of experimental force measurement. In order to obtain gains of PD controller and design a notch filter, the system identification was performed through measuring frequency response including dynamics for the AMBs, a power amp and a sensor using a sine swept test method after levitating the flywheel. Through measuring the current input of the AMBs and the orbit of a flywheel according to rotational speed, we verified excellent control performance of the AMBs with small amount current for the large scale SFESS.

• Journal of the Korean Society of Costume
• /
• v.51 no.1
• /
• pp.87-96
• /
• 2001

This study, dealing with obese bodily figures from the viewpoint of garment shape, was conducted with obese male children of late school ages(nine to eleven years old) to provide data for making ready-made clothing for obese children by directly measuring and analysing the bodily figure of the upper body of them. The results of the study are summarized as follows. 1. According to the basic statistics, for most of obese children the values of the measuring items by ages appeared to be large, and the results of comparison with the National Anthropometric Survey of Korea made in 1997 showed that the values were more large than those of standard physical conditions. 2. It was shown that in the correlation between items the upper breast circumference had a high correlation with all items, and the weight did with the following items such as circumference, height, width and thickness. 3. The results of the principal component analysis showed that six main components hand an explainable power of more than 75.60% for all materials. The first factor was thickness and obesity of the upper body, the second one the height, the third one the length of front and rear sides, the fourth one the width of neck, the fifth one the length of shoulder, and the sixth one the breast width and the wrist circumference.

• Proceedings of the KSR Conference
• /
• 2009.05a
• /
• pp.1542-1549
• /
• 2009

The function of subgrade in the railway is to support track load on the subgrade as well as train load. Unlike the traditional railway, the uppermost subgrade layer in the Gyeongbu high speed railway was constructed as the reinforced road bed. The reinforced road bed comprises sub-ballast in the upper part and grade ballast in the lower part. The filling material such as soil and rocks in the subgrade can be settled by consolidation of original ground, compression due to self weight, plastic displacement due to train operation, and unequal settlement due to embankment material or improper compaction, therefore many efforts have been given for sufficient compaction and use of proper filling materials in the construction stage. The purpose of this study is to investigate the deformation state of subgrade in the Gyeongbu high speed railway. The investigation on the subgrade settlement was performed by choosing representative sections suspected to be settled based on the previous GPR test results and track maintenance history, measuring the settlement for some time period after installing settlement measuring instruments on and under the reinforced road bed. and analyzing the long-term subgrade settlement data from monitoring system which was installed at the construction stage of the high speed railway.

• Journal of Korean Biological Nursing Science
• /
• v.22 no.1
• /
• pp.36-44
• /
• 2020

Purpose: The purpose of this study was to predict measuring site suited for abdominal skin fold thickness (ASFT) by measuring the distribution of abdominal subcutaneous fat thickness (AScFT) and ascertain the correlations among obesity indicators. Methods: The size of analysis materials was 124 secondary data measured by ultrasonic device, bioelectrical impedance analyzer and caliper. Data were analyzed using t-test, and Pearson's correlation. Results: The average of AScFT was 10.63± 6.79mm with its range 1.39-36.16 mm, and AScFT of female and of central parts were thicker than those of male and outer parts in the abdomen. The average of ASFT was 29.26±12.59 mm. Site 5 on Figure 1 was most similar to the average of AScFT in both sexes. Body mass index (BMI) and waist hip ratio (WHR) were 23.65±3.98 and 0.88±0.05 respectively. The body weight, BMI, WHR, visceral fat, ASFT vs AScFT revealed in significant correlation (r= .29, r= .55, r= .39, r= .33. r= .29). Conclusion: BMI and WHR seem more useful than other obesity indicators, when obesity control is necessary for Type 2 diabetes patients. Site 5 on Figure 1 is most suitable site to measure ASFT.