• Tribology and Lubricants
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• 제26권1호
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• pp.68-72
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• 2010

A ceramic coating is a surface treatment method that is being used widely in the industrial field, recently. Ni-P plating is also being used widely because of its corrosion resistance and low cost. An anodizing method is applicable to aluminum alloy. An anodizing method generates a thick oxide layer on the surface and then, that heightens hardness and protects the surface. These surface treatments are applied to various mechanical components and treated surfaces relatively move one another. In this study, tribological characteristics of Ni-P plating and TiAlN coating on anodized Al alloy are compared. The counterpart, anodized Al alloy, is worn out abrasively by Ni-P plating and TiAlN coating that have higher hardness. Abrasively worn debris accumulated on the surfaces of Ni-P plating and TiAlN coating, and then transferred layer is formed. This transferred layer affects the amplitude of variation of friction coefficient, which is related to noise and vibration. The amplitude of variation of friction coefficient of Ni-P plating is lower than those of TiAlN coating during the tests.

• 복식
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• 제56권5호
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• pp.105-117
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• 2006

The purpose of this research was to understand the process of American women's adoption of knickerbockers from the mid-nineteenth to the early twentieth century. Articles and advertisements related to women's knickerbockers found from The New York Times were used as primary sources. Before 1920, women wore knickerbockers when they participated in sports including gymnasium, bicycling, and swimming. Knickerbockers were mostly worn with overskirts when women appeared in the public. Therefore, knickerbockers were categorized as underwear in the advertisements until the late 1910s. However, knickerbockers were even worn on the streets and in offices after American women gained suffrage in 1920. As more women adopted knickerbockers during the 1920s, the public criticisms and regulations on women's knickerbockers intensified. However, the articles on women's knickerbockers gradually disappeared from The New York Times, as they went out of fashion by the end of the 1920s. Considering the social situation and the change in womanhood during the period, I concluded that American women's adoption process of knickerbockers reflected the increase in women's mobility, and the change in gender roles and the definition of femininity.

• Tribology and Lubricants
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• 제16권4호
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• pp.282-288
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• 2000

A sliding friction and wear test for silicon nitride (Si,N4) was conducted using a ball-on-disk specimen configuration. The material used in this study was HIPed silicon nitride. The tests were carried out from room temperature to 1000$^{\circ}C$ using self-mated silicon nitride couples in laboratory air. The worn surfaces were observed by SEM and the debris particles from the worn surfaces were analyzed for oxidation by XPS. The normal load was found to have a more significant influence on the friction coefficient of the silicon nitride than an elevated temperature. The specific wear rate was found to decrease along with the sliding distance. The specific wear rate at 29.4 N and 1000$^{\circ}C$ was 292 times larger than that at room temperature. The main wear mechanism from room temperature to 750$^{\circ}C$ was caused by brittle fracture whereas from 750$^{\circ}C$ to 1000$^{\circ}C$ the wear mechanism was mainly influenced by the oxidation of silicon nitride due to the increased temperature. The oxidation of silicon nitride at a high temperature was a significant factor in the wear increase.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 2006년도 춘계학술대회 논문집
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• pp.149-152
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• 2006

Dry sliding wear behavior of low carbon dual phase steel, of which microstructure consists of hard martensite in a ductile ferrite matrix, has been investigated. The wear characteristics of the dual phase steel was compared with that of a plain carbon steel which was normalized at $950^{\circ}C$ for 30min and then air-cooled. Dry sliding wear tests were carried out using a pin-on-disk type tester at various loads of 1N to 10N under a constant sliding speed condition of 0.2m/sec against an AISI 52100 bearing steel ball at room temperature. The sliding distance was fixed as 1000m for all wear tests. The wear rate was calculated by dividing the weight loss measured to the accuracy of $10^{-5}g$ by the specific gravity and sliding distance. The worn surfaces and wear debris were analyzed by SEM, EDS and a profilomter. Micro vickers hardness values of the cross section of worn surface were measured to analyze strain hardening behavior underneath the wearing surfaces. The were rate of the dual phase steel was lower than the plain carbon steel. Oxidation on the sliding surface and strain hardening were attributed for the higher wear resistance of the dual phase steel.

• 복식
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• 제19권
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• pp.195-207
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• 1992

palestein had been a part of Islamic culture before Israel was established after World War II and their daily lives had been totally affected by the Korean, Consequently, the idea of clothing, types of women clothes and it's characteristics reflected in the Koran have been studied and the results are as follows: First, the idea of clothing reflected in the Koran emphasizes the equality of the sexed and treats women as men's equal partner. Second, in the Koran there is almost no reference on men's clothes, but it only recommends women to wear veil to cover their faces and bodies when they go out. The Koran argues that it is not to restrict women but to protect them. Third, due to it's geographical location, Palestinian clothes had been affected by it's neighboring areas, and the gumbaz-a kind of coat - is one of the examples of Turkish origin. In the beginning the gumbaz had been worn by upper class Palestinian women and subsquently by urban Nazareth women. They used to slip on gumbaz on their heads and shoulders. Fourth, In Palestein they wore jacket over coat or dress. The emboridered jacket from Bethlehem was mostly worn their wedding dress. Fifth, the headdress and face-veil in Palestein are the most unique ones and married women decorated headdress and face-veil with gold or silver coins which they received as wedding presents, and wrapped all their coin decorations in black cloth when husbands are dead. Bedouins decorated not only with coins but also with shells, buttons, stones and beads to articulate their chastity, social status, aestheticism, religion and magic.

• 소성∙가공
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• 제16권4호
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• pp.299-303
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• 2007

Dry sliding wear behavior of ultra-fine grained(UFG) plain low carbon dual phase steel, of which microstructure consists of hard martensite in a ductile ferrite matrix, has been investigated. The wear characteristics of the UFG dual phase steel was compared with that of a coarse grained dual phase steel under various applied load conditions. Dry sliding wear test were carried out using a pin-on-disk type tester at various loads of 1N to 100N under a constant sliding speed condition of 0.20m/s against an AISI 52100 bearing steel ball at room temperature. The sliding distance was fixed as 1000m for all wear tests. The wear rate was calculated by dividing the weight loss, measured to the accuracy of 10-5g by the specific gravity and sliding distance. The worn surfaces and wear debris were analyzed by SEM, EDS and profilometer. Micro-vickers hardness of the cross section of worn surfaces were conducted to analyze strain hardening underneath the contact surfaces. The wear mechanism of the UFG dual phase steel was investigated with emphasis on the unstable nature of the grain boundaries of the UFG microstructure.

• 소성∙가공
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• 제19권6호
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• pp.357-362
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• 2010

Dry sliding wear behavior of pure Fe and Cu which have BCC and FCC crystal structure, respectively, was investigated. The wear characteristics of the pure metals with different crystal structure were compared. Dry sliding wear tests were carried out using a pin-on-disk wear tester at various loads under the constant sliding speed condition of 0.15 m/s against a silica ball at room temperature. Sliding distance was fixed as 600 m for all wear tests. Wear rate of a specimen was calculated by dividing the weight loss of the specimen after the test by the specific gravity and sliding distance. Worn surfaces and wear debris were analyzed by SEM. The wear of both pure Fe and Cu proceeded with surface deformation, resulting in similar wear rates despite of their structure difference under the current test conditions. Wear rates of both metals were low if the surface deformation due to wear forms thick surface-deformation layer that is strain hardened beneath the wearing surface. The pure Cu specimens showed a lot of oxides on the worn surface when tested at low loads less than 5 N, which resulted in very low wear rate.

• 한국의상디자인학회지
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• 제16권2호
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• pp.195-209
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• 2014

This study aimed to identify the preferred jeans design and needed improvements through survey research aimed at men aged 20~29. In order to identify the current wearing trends and problems of jeans, the study carried out survey research aimed at men in their twenties who had purchased and worn jeans. As a result of survey research aimed at consumers, it was discovered that fit was deemed most important during the purchase of jeans. As to the question which type of slacks was worn most frequently, the answer was slim type jeans. Regarding body parts that became the selection standard during the purchase of jeans, the answer was thigh and waist. The body parts that showed the lowest assessment result appeared to be thigh circumference, waist measurement, slacks length, and slacks bottom. To a question asking about things to be repaired and to be improved, they replied that there were problems in measurement fit, dissatisfaction with materials, and washing and management.

• 대한가정학회지
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• 제20권4호
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• pp.13-22
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• 1982

While the women of the Korea Dynasty wore hat(笠子) and Mongsu(蒙首) on top of it when going out, the Yi Dynasty, due to more strict Contucian ethics and isolated way of life, had seen the development of the covering clothes, rather veil, for avoiding the opposite sex with diversity and both men and women began wearing PHO(coat), a Korean topcoat over the head and thurs called Changots, but originally PHO for men was named Changyi a men's outer coat. Neuwul(羅兀), like Mongsu(蒙首) of Korea Dynasty was a thin black hood worn on top of the Wowllip or a kind of skirt draped over the head and the latter was called Changots, very similar to Sgaechima, a kind of long hood formally worn by women. Meanwhile, local women wore a long veil with no arm sleeves dubbed Cheunyi(薦衣) But since western civilization and culture landed on Korea around the end of the 19th century, the women's social status has been raised to almost the same level with men and the way of life has changed towards openness, in which men and women have almost daily contact with one another, so these days we can hardly find such veil style covering clothes around us.

• Tribology and Lubricants
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• 제34권6호
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• pp.284-291
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• 2018

Ball-milling for reactant powders in advance and using an induction heating system for Ni-Al intermetallic coating process are known to enhance the reactivity of combustion synthesis. In this work, the effects of the charging weight ratio of ball to powder in ball-milling for reactant Ni-Al powders and the synthesizing temperature in induction heating on sliding wear behavior of the coating layers are investigated. Sliding wear behavior of the coating layers is examined against a tool steel using a pin-on-disc type sliding wear machine. As results, wear of the coating layer ball-milled without ball was severely worn out at the sliding speed of 2m/s, regardless of the synthesizing temperature in induction heating. However, the wear rate of the coating layers at the sliding speed was remarkably decreased with increasing the charging weight ratio of ball in ball-milling for reactant powders. This can be explained by the fact that the void in the coating layer is disappeared and the coating layer is densified by the ball-milling. The evidence showed that pitting damages were disappeared on the worn surface of ball-milled coating layer. Consequentially, the Ni-Al intermetallic coating layer could have better wear resistance at all sliding speed ranges with the ball-milling for reactant powders in advance.