• Composites Research
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• v.33 no.5
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• pp.256-261
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• 2020

In this study, the ignition temperature of the Al-Ti-C reaction system, the microstructure and the mechanical properties of the TiC/Mg composite which produced by the self-propagating high-temperature synthesis (SHS) followed by stir casting process were investigated. Mg based composite with uniformly dispersed 0, 10, 20, and 30 vol.% TiC were fabricated, and higher volume fraction of TiC reinforced composite showed superior compressive strength and wear resistance as compared with Mg matrix. It is attributed to the less contamination, defects, impurities in TiC/Mg composite by the in-situ SHS yield effective load transfer from the matrix to the reinforcement.

• Journal of the Korean Society of Costume
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• v.62 no.2
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• pp.78-86
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• 2012

Considerate design enhances the familiarity, consideration and design accessibility of various customers. The aim of this study lies on analyzing the aesthetic characteristics and instrumental characteristics of fashion design and applying the considerate design principles. The fashion photograph collection that applies the considerate design principle, was collected from 2006 S/S to 2011 F/W through the following internet site: www. style. com. First, the considerate design key words used in the preceding studies and literatures were classified semantically into these words: "Supportiveness", "Variability", "Ease", "Protection". The result shows that considerate fashion design has used simple, comfortable and achromatic, squared silhouettes that are not affected by the changing trend, simple color coordination and hard materials to prolong the product and the plain pattern. By analyzing the instrumental characteristics of considerate fashion design according to the principles, designs of "Supportiveness" purposely used many changes and showed reversible ways the most. Designs of "Variability" used design changes in length, volume, detail, and other changing forms. Designs of "Ease" used easy-wear apparel, ties and pleats. Designs of "Protection" partially used coverings and different combinations.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.3 no.1
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• pp.15-21
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• 2004

The machining process of ceramics can be characterized by cracking and brittle fracture. In the machining of ceramics, edge chipping and crack propagation are the principal reasons to cause surface integrity deterioration. Such phenomenon can cause not only poor dimensional and geometric accuracy, but also possible failure of the ceramic parts. Thus, traditional ceramics are very difficult-to-cut materials. To overcome such problems, in this paper, h-BN powder, which gives good cutting property, is added for the fabrication of machinable ceramics by volume of 5, 10, 15, 20, 25 and 30%. The objectives of this paper is to evaluate the fracture phenomenon of the tungsten carbide tool and the variation of surface integrity of the manufactured machinable ceramics under various cutting conditions during end mill machining With CNC machining center.

• Special Issue of the Society of Naval Architects of Korea
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• 2013.12a
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• pp.66-72
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• 2013

The demand for an ice class ship is rising expected to rise according to the increase of energy consumption and the opening of arctic sea routes. Ice class ship should be designed to cope with the severe environmental conditions of arctic sea such as a high mechanical impact and abrasion damage, caused by pack ice, ice bergs and low temperature. The ice class ship hulls are coated with an anti-abrasion and low friction coating such as a solvent free epoxy or high solid-volume epoxy. These coatings require two-component heating pump and a high grade surface preparation. In this study, the coating performances for the arctic vessels, such as puncture absorbed energy, abrasive wear loss, friction coefficients and impact absorbed energy were evaluated. Based on this study, a proper coating performance specification for the arctic vessels was proposed and coating selection guideline in terms of coating performance and workability was also established.

• Transactions of The Korea Fluid Power Systems Society
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• v.1 no.3
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• pp.7-13
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• 2004

The hydraulic pump for a Electro-hydrostatic Actuator for aircrafts should be able to quickly feed large volume of oil into hydraulic cylinder in order to reduce the response time. On the other hand, it should be also able to precisely dispense small amount of oil by low-speed operation so that the steady state position control error of the EHA can be accurately compensated. This paper is focused on the investigation how the plasma coating surface treatment of cylinder barrel with CrSiN can contribute to the reduction of low-speed friction torque of a bent-axis type piston pump. The results showed that the reduction of the friction torque was not remarkable, but that the anti-wear characteristics of the CrSiN-coated cylinder barrel were much better that those of the original one.

• Tribology and Lubricants
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• v.28 no.6
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• pp.321-327
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• 2012

Paraffin bio-based hydrotreated biodiesel(HBD) is originated from vegetable oil(the process can also be applied to animal fat) with the the chemical structure $C_nH_{2n+2}$. In the number of process of the oil or fat, the hydrogenation is significantly important to create a bio-based diesel fuel. This study is focused on lubricity characteristics of BTL diesel blends to use alternative diesel fuel in Korea. The BTL diesel are blended the different volume ratios (HBD 5(5 vol.% HBD - 95 vol.% diesel), HBD 10, HBD 20, HBD 30, HBD 40 and HBD 50. HBD with paraffin compounds showed a very high centane number, low sulfur content and free aromatic compound. Especially, the wear scar of HBD showed poor lubricity compared to automotive diesel due to the fuel composition, low sulfur content and free aromatic compound. Also, the lubricity specification of automotive diesel with different six HBD blends is within the limit by the Korean standards. Finally, HBD as an alternative diesel fuel is challengeable in transportation sector of Korea.

• Journal of the Korean Society of Clothing and Textiles
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• v.41 no.4
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• pp.741-751
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• 2017

Adolescent girls experience significant breast growth is a significant secondary sexual characteristic development; their breasts are clearly different from adults' in volume, location and shape. This study was designed to understand brassiere wearing conditions and practices of adolescent girls aged between 15 and 18, as well as to identify problems and solutions so that it can serve as basic guidelines to develop patterns and sizes for adolescent brassieres. This researcher first studied brassiere wearing conditions and size fitness of adolescent girls. We analyzed the 439 collected responses from an online survey. The survey questionnaires encompassed brassiere wearing conditions and practices, brassiere size awareness, brassiere design preference, and brassiere purchase behavior. The survey found that 55.8% of the responders did not accurately understand their brassiere sizes, and those who understood their size showed a higher satisfaction and less discomfort than those who did not. This study found a requirement to educate adolescent girls on how to select and wear the right-sized brassieres. It is also necessary to promote different brassiere designs for adolescent girls' size and body shape.

• Journal of the Korean Home Economics Association
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• v.46 no.10
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• pp.37-48
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• 2008

This study re-examines new aesthetic values pursued by Givenchy, analyzing by the Haute Couture line's chief designers. The following conclusions have been reached: Hubert de Givenchy pursued modernity, infused with simplicity and structured stability. In particular, Audrey Hepburn, who was a loyal client and used his line in several movies, provided him the platform for international exposure which he used to further develop what became known as the "Hepburn" style. The subsequent brief tenure of John Galliano did yield the fantastic and magnificent "Galliano-style", but with irregularity. Based on romanticism, it redefined fashion using a wide range of colors, subjects and decoration. His successor, Alexander McQueen, applied opposite elements using a hybrid technique of pastiche, parody and collage. With innovative inspiration he compromised the concepts of gender, time, space and cultures and recreated futuristic forms of nature, animals, insects and mythical images. Julien Macdonald, who was appointed in 2001 as the Artistic Director for the women's collections, minimized his individual style and preferred feminine, graceful and sexy silhouettes. He breathed fresh life in to Givenchy Haute Couture, reinterpreting the Hepburn style in a modernistic mode. Being passed on the responsibility for both collections (i.e., haute couture and ready-to-wear) in 2005, Riccardo Tisci redefined elegance, combining his unique and tailored gothic style with Givenchy's grace. He is developing the future of Givenchy, experimenting with volume, silhouettes, new kinds of fabric and techniques.

• Tribology and Lubricants
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• v.38 no.3
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• pp.109-114
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• 2022

This paper reports the development of an oil flushing system combined with a microbubble generator. Oil flushing plays a crucial role in regulating the lubricant's performance during the lubricant replacement process. Moreover, harmful contaminants, such as sludge, wear particles, and rust, from piping systems or lubrication system can be removed by oil flushing. Oil flushing aims to increase the system's efficiency using a dedicated flushing oil, increasing of the supply pressure and generating a vortex. In addition, it helps the mechanical system or equipment achieve peak performance and reduces the potential for premature failure. However, the contaminant-removal applications of existing oil flushing system are limited. In this research, we aim to improve the performance of oil flushing system by incorporating a microbubble generator, which uses the venture effect to generate microbubbles and mixes them with lubricant. The microbubbles in the blended lubricant remove contaminants from the lubrication system more effectively. Structural mechanics and fluid dynamics are analyzed through fluid-structure interaction (FSI) analysis, and the numerical analysis results are used for the designing the system. The magnitude of the maximum stress is investigated based on the pressure results obtained by the CFD analysis; through the CFD analysis, the mixing ratio of air (bubble) and lubricant is evaluated using the volume of fluid (VOF) model according to the working conditions.

• Journal of Fashion Business
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• v.27 no.6
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• pp.66-84
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• 2023

Handbags are a part of fashion and while their significance and value are increasing, research on this topic is lacking. This study defines handbags and categorizes the materials used for making handbags, sewing methods, expression techniques, and terminologies related to accessories. A total of 1,743 handbags that were released from the Spring 2020 to Fall 2023, Ready-to-Wear collections by 8 selected brands (Hermes, Dior, Fendi, Chanel, Louis Vuitton, Prada, Gucci, and Alexander McQueen), were analyzed. Out of these, 732 unique designs, excluding those with only color variations, were studied. The most common sewing methods were 'Cut, sewing, and edge painting', 'Cylinder arm sewing', 'Cut, edge painting, and sewing', and 'Inverted seam', in that order. Slim strap designs primarily used the 'Cut, sewing, and edge painting' method, whereas the body, especially with narrow and hard leather, was best suited for the 'Cylinder arm sewing machine'. For expression techniques, the most frequently used methods were 'Quilting', 'Metal Eyelet', 'Embossing', 'Printing', 'Punching', and 'Weaving', respectively. The characteristics of each brand's production methods, expression techniques, and accessories were as follows: First, the exposure of logos and monograms is prominent. Unlike clothing, handbags often prominently feature the brand's logo or monogram. Second, signature quilting is a prominent feature. Quilting effectively conveys the brand's signature style, providing cushioning, volume, and pattern effects. Third, sustainable development is a growing trend. Brands are increasingly applying eco-friendly and socially responsible designs.