• KSTLE International Journal
• /
• v.4 no.1
• /
• pp.31-36
• /
• 2003

Sliding and impact/sliding wear test in room temperature air and water were performed to evaluate the effect of spring shapes on the wear mechanism of a fuel rod. The main focus was to quantitatively compare the wear behavior of a fuel rod with different support springs (i.e. two concaves, a convex and a flat shape) using a ratio of wear volume to worn area (De)-The results indicated that the wear volumes at each spring condition were varied with the change of test environment and loading type. However, the relationship between the wear volume and worn area was determined by only spring shape even though the wear tests were carried out at different test conditions. From the above results, the optimized spring shape which has more wear-resistant could be determined using the analysis results of the relation between the variation of De and worn surface observations in each test condition.

• KSTLE International Journal
• /
• v.4 no.2
• /
• pp.47-51
• /
• 2003

Sliding wear tests have been carried out in room temperature air and water in order to compare the wear resistance of Zr-xNb-xSn alloys of various alloying elements (Nb and Sn). The main focus was to quantitatively compare the wear properties of the recently developed Zr-xNb-xSn alloys with the commercial ones using the evaluation parameters of the wear resistance with the consideration of the worn area. As a result, the recently developed alloys had a similar wear resistance compared with the commercial ones. The dominant factor governing the wear resistance was the protruded volume of the wear debris that was formed on the worn area in the air condition, but the accommodation of the plastic deformation on the contact area in water. In addition, the worn area size appeared to be very different depending on the tested alloys. To evaluate the wear resistance of each test specimen, the ratio of the wear volume or the protruded volume to the worn area ($D_e$ or $D_p$) is investigated and proposed as the evaluation parameters of the wear resistance.

• Proceedings of the KSME Conference
• /
• 2004.11a
• /
• pp.256-261
• /
• 2004

To evaluate the effect of spring shape on the fretting wear of nuclear fuel rod, sliding wear tests were performed using three kinds of space grid springs in room temperature air and water. With increasing slip amplitude, wear volume of each spring gradually increased. It is apparently shown that spring with convex shape had a relatively high wear resistance compared with concave shape springs. It is suggested that the ratio of the wear volume to the worn area can be suggested as an efficient and valid parameter to evaluate the wear resistibility of a fuel grid spring.

• The Research Journal of the Costume Culture
• /
• v.8 no.1
• /
• pp.115-122
• /
• 2000

There are many battle paintings among wall paintings in Kokuryeo. Most warriors in paintings wore armours in full kit. Armours in Three-Kingdom Period were contrived for strategy. They have been checked that Pangab suitable for infantry action had been worn in Shilla while flexible Chalgab for cavalry battle had been worn in Kokuryeo. As cavalry strategy in Kokuryeo was brought to Kaya Kingdom via battles in fifth century, Chalgab became also worn in South area. Pangab, Shaejagab and Nubigabot as well as Chalgab had also been worn on view of wall paintings. There were many kinds of helmets such as Jongjang-panju, Mangokjongjang-panju, Kwanmonhyoungbok-balju, Chongkakju and Kwaehyoungju. Accesory-Armours are Sanggab, Kyounggab, Sangbakgab, Gwinggab, Daetwaegab and Kyounggab. Those helmets and Accesory-Armours are quite similiar to excavations from Shilla, Kaya Kingdom area. As Kokuryeo wall paintings are related to excavations from South area, armours and helmets in those wall paintings can be a good data to investigate the full shape of excavations and how to use, while excavations are very useful to the study on method of construction and manufacturing of armours and helmets.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
• /
• 2003.11a
• /
• pp.313-323
• /
• 2003

The sliding wear behaviors of Zircaloy-4 nuclear fuel rod were investigated using two support springs with convex and concave shapes in room temperature air and water. The main focus is to compare the wear behavior of various test variables such as slip amplitude, environment, contact contours with different spring shape and a number of cycles. The results indicated that wear volume and maximum wear depth increased with slip amplitude in both air and water, but their trends tended to change according to the spring shapes and test environments. In air condition, the wear volume was controlled by wear debris behavior generated on worn surface. As a result, final wear volume and maximum wear depth decreased if a ratio of protruded wear volume to worn area $(D_p)$ would be saturated to specific value. This is because wear particle layer could accommodate large strain by accumulating and transforming wear particle layer. However, in water condition, metal-to metal contact was more dominant and wear volume was greatly affected by changed mechanical behavior between contact surfaces since wear debris should be generated after repeated plastic deformation and fracture. After wear test, worn surfaces were examined using optical microscope and SEM and details of wear mechanism were discussed using a ratio of wear volume to worn area $(D_e)$ at each test condition.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
• /
• 2004.11a
• /
• pp.37-40
• /
• 2004

The impact/sliding wear tests have been performed in high temperature high pressure water in order to evaluate the effect of spring shape on the wear behavior of a spring supported tube for nuclear fuel fretting study. The results indicate that the tube wear volume and the size of the wear scar are closely related to each spring shape. From the analysis of the wear scar, it is possible to extract the real worn area (Aw) from the size of the wear scar (At). In addition, we found that the wear volume has a linear relation with the real worm area rather than the size of wear scar and this was only determined by each spring shape in the high temperature and pressure water condition. From the above results, it is possible to evaluate the wear resistant spring using the correlation between the variation of the real worn area and the wear behavior at each spring.

• Journal of the Korean Society of Costume
• /
• v.20
• /
• pp.191-201
• /
• 1993

As a part of study examining Korean costume remaining in Yanbian China, this study explored changes in ceremonial clothing for marriage worn by Korean(Chosun race) in Yanbian China. About one hundred years ago, Koreans moved to Yanbian China and had worn traditional clothing for marriage ceremony until before 1940. Data were collected by true interview and field observation while staying in that area. Samo and Dalyung for bridegrooms, Wonsam and Jockdoory for bridegrooms, wonsam and Jockdoory for brides were usual costume for wedding ceremony, however, for couples in inferior conditions of life, Bazy and Jeogory for bridegrooms, yellow Jeogory and red Chima for brides were accepted for ceremonial costume. As western culture came to this area in about 1940, bridegrooms wore western style suit, while brides dress in white Chima, Jeogory and Neowool. To date, Korean brides have worn traditional Chima and Jeogory for marriage ceremony though slight change has occurred in clothing material and in the forms of Chima, Geogory and Neowool. As the pratice reflected the fact that Korean in Yanbian China as established and sustained traditional China as established and sustained traditional costume and Korean identity even in hush socio-cultural environment.

• Proceedings of the KSME Conference
• /
• 2004.04a
• /
• pp.84-89
• /
• 2004

When the tube contacted to support, anti-vibration bar of the steam generator in nuclear power plant, the contact area is worn out by their relative displacement and contact force. Connors and Au-Yang found the relation between tube worn displacement and volume, or normal work rate at given gap size. The present analysis is obtained the relation between tube worn displacement and normal work rate at various gap size modifying Au-Yang's result. The results are compared with Connors and Yettisir and Pettigrew's results. The comparison shows that Yettisir and Pettigrew result is fairly good agreement with Connors and present results with gap clearance, 0.015in.

• Fashion & Textile Research Journal
• /
• v.16 no.3
• /
• pp.406-420
• /
• 2014

The goal of this study is to support the children's pants construction methods that secure clothing size and fit appropriateness through proposed improvements of denim pants construction method focusing on 4-year-old boys. Depths interview on the actual condition, measurements and calculations for positions and ease of the clothing points corresponding to the body points actually worn were conducted for 47 denim pants of nine boys. "Characteristics of the areas worn" and "physical characteristics of lower body" were analyzed, and improvements of 4-year-old children's denim pants construction method were proposed. As the results, the different figures in "characteristics of the areas worn" between the existing children's pants construction methods and children's actual wearing habits were found, and identification of distinct children's lower body from adults' supports that we should avoid tracing adults' methods without reasons. Children's pants construction method on basis of actual wearing should be devised to solve fit problems. Improvements of children's method were proposed such as ease of girth by different area worn, ease of "elastic waist girth", the difference between "elastic waist girth" and "pattern waist girth", and the difference between "pattern waist girth" and "pattern hip girth" as considerations of pants girth items, and appropriate position "clothing waist girth" "pants hip length" level, "pants crotch length" level, "clothing knee length" level, and "pants outside length" level for pattern making as considerations of clothing length items.

• Journal of the Korean Society of Clothing and Textiles
• /
• v.18 no.5
• /
• pp.739-748
• /
• 1994

These days the Korean costume becomes the formal dress to be worn on particular occasions. The Westernization of life style, inculding dress, has made the costume of wearing traditional dress disappear from Korean's everyday life. This study is launched to investigate the precious textiles and materials of the past before they vanish; this study deals with the materials of folk costume in the early 20th century, preceding Westernization. The research method adopted in the study was interviews of fifth- five elderly persons living around the Mt. Kumo area in Gyungbuk province. The result was that costume culture in that area was poor because people living in the area were economically less well off due to meager agricultural products. There was no variety in the style of costumes to be worn for various occasions. It was also nothworthy that because of no diversification in naming, only one representative word was used to name several types of costumes. On the other hand, it was discovered that the people in the Mt. Kumo area had religious aspirations stemming from their folk beliefs concerning costumes. They also had an attitude of saving money despite poor economic conditions.