• Journal of the Korea Institute of Military Science and Technology
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• v.6 no.4
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• pp.73-79
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• 2003

Fatigue test is conducted to see the effect of pre-indentation on the fatigue crack retardation of Al5052-H18 plate. Metallographic observation is introduced to deduce the relationship between fatigue crack retardation and fracture appearance with indentation. The grain size of the specimen becomes smaller with the increase of indentation force and the plastic zone is formed with the decrease of grain size. The fatigue striations are appeared densely as the Indentation force becomes higher. Metallographic observation and fatigue test results show that the indentation force has the limited value in improving fatigue crack retardation. Important point to retard the fatigue crack growth is that the crack growth path should pass through the indented area.

• The Journal of Korean Medicine
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• v.21 no.3
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• pp.199-208
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• 2000

Objectives : In order to investigate the toxicity of rats after oral administration of Eumcheonyijin-tang extract. Methods : The experimental animals were subdivided into control, short term administration group, and long term administration group. With changes of gross appearance, the histological changes of liver and kidney were observed. Blood chemical indexes used in this study were AST, ALT, total bilirubin, albumin, BUN and creatinine in serum. Results : In the long term administration group, histological changes were detected in the liver as centrolobular disposition of fatty tissue(adipose cell), and in serum test, AST, ALT increased at 21 days after administration group, serum total bilirubin were increased 21, 28 and 35 days after administration group. So it seems to induce toxicity. Kidneys of the long term administration group revealed histological changes : increasing of connective tissue and pyknosis of glomerulus cell were observed at 28 days after administration group, and in serum test, significant changes of albumin, BUN, and creatinine were admitted. So it seems to induce toxicity. Conclusions : In long term administration of Eumcheonyijin-tang toxicity was induced.

• Culinary science and hospitality research
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• v.23 no.5
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• pp.101-108
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• 2017

This study was conducted to investigate the noodle added with Pachyrhizus erosus powder. Total contents of carbohydrates, crude protein, crude lipid, ash, and total dietary fiber were 87.14%, 3.14%, 0.81%, 7.82%, and 49.12%, respectively. The water-binding capacity was significantly increased by increasing amount of the Pachyrhizus erosus powder. When the volume of the noodles was measured after cooking, there was no difference between the control and Pachyrhizus erosus powder groups. The texture characteristics of hardness increased by increasing amount of the Pachyrhizus erosus powder. As a result of the sensory test, the 1.5% Pachyrhizus erosus powder noodles showed the highest scores for all items including appearance, flavor, taste, texture and overall acceptability. The bacterial counts of noodle decreased with greater Pachyrhizus erosus powder content on the third days. It is considered that research on antimicrobial activity should proceed in the future. As a result, it was finally suggested that optimum level of the Pachyrhizus erosus powder in the product was 1.5% level.

• Proceedings of the Korea Concrete Institute Conference
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• 2006.05b
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• pp.297-300
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• 2006

Recently, To extend building's life, the use amount of repair mortar has been rapidly increased and naphthalenesulfonic and melanminesulfonic, polycarboxylic superplasticizer etc. are used for repair mortar in large numbers of construction site for efficient work. In this study, it was going to examine the use proper of superplasticizer for repair mortar through the hydrate setting time test and flow test with the mortar combination which replaced by alumina cement and added superplasticizer. As a result, the fluidity of the mortar replaced by alumina cement(10%) and added superplasticizer was dropped down and setting time was shortened. Especially this appearance was more increased on the mortar combination added ploycarboxylic and melanminesulfonic superplasticizer than naphthalensulfunic superplasticizer.

• International Journal of Ocean System Engineering
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• v.3 no.4
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• pp.218-224
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• 2013

This paper describes the design and control of a hovering AUV test-bed and analyzes the dynamic performance of the vehicle using simulation programs. The main purpose of this vehicle is to carry out fundamental tests of its station keeping, attitude control, and desired position tracking. Its configuration is similar to the general appearance of an ROV for underwater operations, and its dimensions are $0.75m{\times}0.5m{\times}0.5m$. It has four 450-W thrusters for longitudinal/lateral/vertical propulsion and is equipped with a pressure sensor for measuring the water depth and a magnetic compass for measuring its heading angle. The navigation of the vehicle is controlled by an onboard Pentium III-class computer, which runs with the help of the Windows XP operating system. This provides an appropriate environment for developing the various algorithms needed for developing and advancing a hovering AUV.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.28 no.4
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• pp.165-170
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• 2016

Long-term performance of the enthalpy exchange element is a topic of current interest due to the concern of possible performance degradation over time. In this study, a 350 CMH enthalpy recovery ventilator equipped with an enthalpy exchange element was installed in an office room, and the performance has been traced over the past 5 years. The appearance, overall dimension, thermal performance, leakage ratio and anti-bacterial performance were checked annually. Results showed that the change in thermal performance (sensible, latent and enthalpy efficiency) was negligible with periodic cleaning with an air gun. However, the leakage ratio increased with time, measuring 7.3% after 5 years. Anti-bacterial test revealed that no bacteria were found during the test period. The largest change in the dimension occurred at the middle location of the element, although the change was less than 2% of the initial value.

• Korean Institute of Interior Design Journal
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• v.16 no.5
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• pp.115-125
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• 2007

As a part of "The method of suitable design for resident," the purpose of this study is to figure out the resident aptitude of client through "Saju-Myungrihak" more effectively and precisely. That is, the study is to find out the relations between individual character and environmental interior tendency through experimentingss to make Images based on one's individual inherent aptitude and character. For all these reasons, we proudly launch to develop the interior design program based on emotional inherent-aptitude technology for our clients with applying Nakamitch Mizuo's emotional technology thesis "the Expert System." However, a critical implication made by Nakamitch Mizuo's emotional technology, elucidates the fact that there was a problem for understanding the system of client's inherent aptitude. 1. Appearance of The inherent-aptitude in Saju-Myungrihak 2. MBTI (Myers Briggs Type Indicator) Form K 3. To strengthen and develop the tools of visual images through understanding clients' character and tendency by the result of his or her DNA (ACE, DRD4, DRD2, G-protein) test.

• Proceedings of the KSME Conference
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• 2000.04a
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• pp.326-332
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• 2000

It should be essentially considered as important points that design of case in electronic product which simultaneously satisfied with structural stability and molding form in respect to developmental period and economical aspect. Especially, a shape of air vents grille, which is made to emit heat happen to be in the internal of product, must satisfy durability and strength but We have no quantitative data because to be done by experience of designer. So, in this study, We will propose that structure of optimal and method of design in air vents grille, which to reduce a lot of loss of time and cost due to trial and error of design and to stabilize in the BALLISTIC Impact test as to estimate strength with external appearance of product, using linear analysis.

• Journal of the Korean Society of Clothing and Textiles
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• v.12 no.2 s.27
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• pp.145-158
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• 1988

The purpose of this study was develop a skirt pattern drafting method for pregnant women on the basis of their physical characteristics. The study procedures and results were as follows; 1. One hundred and one women who were 7,8 or 9 months pregnant were measured on 29 items. The result was computed to obtain descriptive statistics and correlation coefficients between each items. 2. Two new skirt patterns were developed based on the data analysis. 3. The sensory evaluation was applied to evaluate the new patterns for pregnant women by comparing them with the Japanese MOONHWA method skirt pattern for pregnant women. Sensory evaluation for appearance: According to the result of Mann-Whitney test among the three skills the skirt A was most satisfactory, and the next was the skirt B followed by Japanese MOONHWA method Skirt. Sensory evaluation for comfort; The result of Mann-Whitney test showed that the skirt B was comfortable, and the next was the shirt A followed by Japanese MOONHWA method skirt.

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.4
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• pp.189-195
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• 2003

The steel wheels are widely used in the passenger cars because of their low cost of production although the aluminum wheels have many advantages in their performance and appearance. It is known that the steering wheel vibration with steel wheels is generated more often than one with aluminum wheels. Both the constant velocity driving test and the m up test are carried out in this study to analyze the causes and path of the steering wheel vibration generated from the steel wheels. And this study shows that the steering wheel vibration is affected by the fastening torque of the wheel mounting bolts between the steel wheel and the suspension disk.