• Polymer(Korea)
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• v.36 no.2
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• pp.196-201
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• 2012

Electrospinning is a versatile process used to prepare micro or nano sized fibers from various materials dissolved in volatile solvents. This study reports electrospun pullulan fibrous webs fabricated through electrospinning using water as a solvent. The electrospinning conditions such as pullulan (PUL) concentration and applied voltage were optimized in order to obtain smooth electrospun fibers. The concentration of PUL greatly influenced the viscosity and surface tension of PUL solution. PUL beaded electrospun fibers were obtained from PUL solutions with concentrations lower than 5 wt%, while homogenous electrospun fibers were prepared from solutions with high concentration and high viscosity. The average diameters of PUL fibers were decreased to 200 nm when the polymer concentration was kept at 10 wt% and the applied voltage was fixed at 15 kV during electrospinning. PUL electrospun fiber exhibited higher solubility, flexibility, softness and adhesive strength.

• Journal of Fashion Business
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• v.11 no.3
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• pp.79-86
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• 2007

The purpose of this study is to understand the dyeing properties and color analysis of fabrics knitted with ramie, cotton, wool and acrylic by using scoria and to analyze whether the knitted fabrics can be used for industrialization by measuring color fastness after and before sliver-nano process. The following is the conclusions. Firstly, when ramie fabric regarding cotton, wool and acrylic was dyed at the temperature of $50^{\circ}C$ for fifteen minutes by using 10, 25, 50, 100g/ $\ell$ of scoria, dyeing absorption gradually increased up to 50g/ $\ell$, and over the point of 50g/ $\ell$ it showed slow increase. Secondly, regarding saturation, among ramie fabric, wool, cotton and acrylic, wool appears as the lowest brightness. Therefore, it can be dyed with bright color and the highest value. In terms of the value of chromaticity, wool also emerges as the lowest brightness. On the contrary, acrylic showed the lightest red as it had the value of the smallest b. Cotton takes the lightest yellow as the b value of the cotton showed the smallest. Thus, scoria dyestuff is a material that showed strong red and yellow on knitted fabric mixed with wool that is the biggest a. b value. Thirdly, in terms of dyeing fastness, sunlight fastness did not show noticeable differences before and after silver-nano processes, but in terms of washing and friction fastness, the material processed by silver-nano indicated that all knitted fabrics are over 4-5 point. which means silver-nano process can be effective for the industrial applications. As mentioned above, as a result of dyeing knitted fabrics with scoria, this study found a possibility of dyeing in the fabric materials, and if there is deeper dyeing experiments, fastness experiments and speculations, it might be possible to be a big issue just like loess and charcoal.

• Journal of the Korea Fashion and Costume Design Association
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• v.9 no.3
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• pp.59-73
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• 2007

The purpose of this study is to find out the promotion methods for successful management of 'the fashion saho internet shopping mall' with a small capital. This study analyze the research reports, the news items, the documents on the internet shopping mall and data on promotion method which are offered by the hosting companies of the internet shopping mall like 'Cafe 24', 'Make shop', 'Whoismall' and the promotion consulting companies like 'Whoisad', 'Naver keyword shop'. And also analyze the data that interviewed the administrator of internet shopping mall and directly observed the famous internet shopping mall sites. Generally speaking, the promotion mix, marketing communication program can classify 'advertisement', 'publicity', 'personal selling', and 'sales promotion'. This study analyze the research materials on the basis of advertisement, publicity, personal selling, and sales promotion. The result are as follows. 1. The promotion methods at the stage of information the shopping mall site to the consumer are advertisement, and publicity. ${\bigcirc}$ The methods of advertisement are 'searching engine registration', 'advertisement of key word', 'advertisement of overture', 'advertisement of banner', 'advertisement cooperation marketing', 'advertisement of e-mail'. ${\bigcirc}$ The methods of publicity are using 'cafe', 'blog', 'Naver information site', 'community bulletin board', 'the fashion magazine or a press report' and 'cosponsorship'. 2. The main promotion methods at the stage of inducing the purchase are 'personal selling', and various 'sales promotion'. ${\bigcirc}$ 'Personal selling' at the shopping mall have an effect on the communication at bulletin board over the internet and the telephone. ${\bigcirc}$ 'Sales promotion' are attempted by 'VMD', 'deposit system', 'sale', etc.

• Journal of the Korean Home Economics Association
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• v.39 no.5
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• pp.75-88
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• 2001

This research aims to obtain basic information on the present situation of the instructional media on clothing and textiles education, in middle and high schools. It also strives to get various information needed in order to improve educational environments and teaching methods. The targets of this survey were 225 teachers who teach home economics at middle and high schools in Taejeon, Choongchungnamdo and Junrabookdo. I made up questions their awareness about the instructional media on clothing and textiles education, the educational circumstances of their schools having to do with new media, and their real educational goal. Methods such 3s frequency, percentage, and Chi-square(${\chi}^2$)(statistical significance of differences between variables) were used to research the differences of awareness on using instructional media, according to teachers'various characters, were checked using the SPSS WIN computer program. The results of this research were as fellows; 1. They thought content on the management and the materials of clothing were the ones that need to be developed, compared to other content having to do with the curriculum on clothing and textile education. 2. The real things tuned out to be the molt useful and effective. So the most frequently used media was the Over Head Projector. Also, the teachers expressed in general that they wished to increase the use of computers in order to teach more efficiently. 3. We knew the teachers had little knowledge on the software developed for clothing and textiles education. The infrastructures for educating the using of clothing and textiles, using computers and the internet, were very poor in most schools. The new curriculum that has been proposed needs a more enlarged investment in order for it to function properly and effectively.

• Applied Chemistry for Engineering
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• v.3 no.3
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• pp.430-439
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• 1992

To improve the adhesion of interface and dispersion of glass beads in the composite, HDPE filled with glass brads, we encapsulated the g1ass beads with polymer by phase separation method using complex coacervation in organic solvent. EMAA and EAA were used as the polymeric wall materials. The microencapsulation efficiency and morphology were observed by thermogravimetric analysis and SEM, respectively. And also we investigated the physical and dynamic mechanical properties of the composite as the function of the beads contents and microencapsulation efficiency. Compared with the composite containing non-treated glass beads, the decrease in tensile strengthe of the composites containing the encapsulated glass beads become markedly small, and about 30~40% Increase in tensile modulus was observed. From the results of the dynamic mechanical analysis, it was found that the adhesion of interface and dispersion could be improved upon encapsulation.

• Journal of Fashion Business
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• v.12 no.3
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• pp.153-166
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• 2008

The purpose of this research is to analyze the overall process of the wedding industry - arranging domestic wedding firms and formulating a database related to the business. Simultaneously, with all the data in hand the research attempts to seek flaws within the wedding industry and tries to offer solutions to revitalize the industrial section. Because the list of articles is enormously expansive, for the purpose of basic research, objects have been selected according to the process presented below. Wedding-product firms have been classified within the boundaries of dresses, studios, and makeup firms; distributing channels are mainly focused on wedding planners and related-consulting firms; related departments of universities and wedding organizations are illustrated as well. Due to the unorganized system of this particular field, the research process has been conducted with materials from personal experiences, newspapers, magazines, Internet websites, documents, and interviews with wedding-related firms and organizations, and professors. As a result, over 13 subjects which formulate a market structure of over 30 trillion won. However, due to lack of systemization of the industry, as it expands, numerous problems occur. Excessive competition between wedding-consulting firms and the lack of reliable education for wedding planners, unnecessary external investment and the lack of product research, false Information from the Internet puts the entire industry in a inefficient position. Organizations such as Korea Traditional clothes Industrial Union, Korea Wedding Consulting Association, Korea Martial Industrial Promotion Association(KOMIPA) etc, are made to seek for solutions. For the wedding industry to revitalize, wedding-product firms, wedding planners and consulting firms must maintain an organic relationship every season. They must systemize a proper distribution system, with wedding-product companies enhancing the quality of products, wedding planners organizing wedding plans with responsibility, and consulting firms focusing not only on profits. In order to make high-valued products, wedding-product companies must put their greatest effort in producing talented minds, and universities with related departments must do so as well. In other words, the industrial and educational section of our society must cooperate through a sophisticated system. In addition, related organizations must act to receive governmental support in order to support the industry.

• Polymer(Korea)
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• v.36 no.1
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• pp.29-33
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• 2012

Solution type pressure sensitive acrylic adhesives were synthesized from 2-ethylhexyl acrylate (2-EHA) as a base monomer and acrylic acid as a functional monomer. The surface energy and basic physical properties of synthesized PSA (pressure sensitive adhesives) were investigated as a function of contents of acrylic acid and crosslinking agent. The structures of adhesive were identified by FTIR. Viscosities and molecular weights of PSA were measured by a Brookfield viscometer and GPC, respectively. Consequently, molecular weight and viscosity increased as the contents of acrylic acid increased up to 6 wt% and then decreased at higher contents. Surface energy increased as the contents of acrylic acid increased owing to the increase of COOH groups, which yielded the enhancement of polarity of PSA. On the other hands, their peel strengths were inversely proportional to molecular weight and showed tendencies of decreasing as the contents of acrylic acid and crosslinking agent increased.

• Geomechanics and Engineering
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• v.18 no.3
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• pp.315-328
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• 2019

This paper presents an investigation on bearing capacity, load-settlement behavior and safety factor of rock-soil slopes reinforced using geogrid-box method (GBM). To this end, small-scale laboratory studies were carried out to study the load-settlement response of a circular footing resting on unreinforced and reinforced rock-soil slopes. Several parameters including unit weight of rock-soil materials (loose- and dense-packing modes), slope height, location of footing relative to the slope crest, and geogrid tensile strength were studied. A series of finite element analysis were conducted using ABAQUS software to predict the bearing capacity behavior of slopes. Limit equilibrium and finite element analysis were also performed using commercially available software SLIDE and ABAQUS, respectively to calculate the safety factor. It was found that stabilization of rock-soil slopes using GBM significantly improves the bearing capacity and settlement behavior of slopes. It was established that, the displacement contours in the dense-packing mode distribute in a broader and deeper area as compared with the loose-packing mode, which results in higher ultimate bearing load. Moreover, it was found that in the loose-packing mode an increase in the vertical pressure load is accompanied with an increase in the soil settlement, while in the dense-packing mode the load-settlement curves show a pronounced peak. Comparison of bearing capacity ratios for the dense- and loose-packing modes demonstrated that the maximum benefit of GBM is achieved for rock-soil slopes in loose-packing mode. It was also found that by increasing the slope height, both the initial stiffness and the bearing load decreases. The results indicated a significant increase in the ultimate bearing load as the distance of the footing to the slope crest increases. For all the cases, a good agreement between the laboratory and numerical results was observed.

• Textile Coloration and Finishing
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• v.33 no.3
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• pp.153-160
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• 2021

In this study, composite materials were prepared by varying the content of glass fiber and bamboo fiber in PP/glass fiber/bamboo fiber. Experiments were conducted to confirm the mechanical properties(tensile, impact and burst strength) and volatile organic compound content of the bamboo fiber composite prepared under these conditions. An improvement in the main properties was observed at a fiber content of 30wt%. When the fiber fraction was increased above 30wt%, the mechanical properties tended to decrease due to the agglomeration of fibers at higher load fractions. In addition, the content of volatile organic compounds increased as the content of bamboo fibers increased, which is thought to be due to the volatile organic compounds generated during the manufacturing process of the composite material being present in the composite material without escaping from the pores of the bamboo fibers and volatilizing at a certain temperature. As a result of confirming the physical properties of the composite, it is considered that the optimal mixing condition is 30wt% of bamboo fiber for the composite produced by varying the amount of bamboo fiber composite. In the future, it is thought that follow-up experiments to confirm and improve the pre-treatment conditions for reducing the content of volatile organic compounds in the manufactured composite material are possible.

• Textile Coloration and Finishing
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• v.33 no.1
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• pp.31-39
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• 2021

In this study, the dyeing properties of supercritical fluid dyed nylon fabrics were investigated which use two types of dyes for dyeing nylon. For other dyeing conditions were referred to related literature, and dyeing was performed with different dyeing concentrations. Dyeability was confirmed through measurement of washing fastness and color coordinate, and a calibration curve of each dye was drawn up and the absorbance of the residual dye was measured to confirm the amount of residual dye and the dye exhaustion rate at the corresponding concentration. As a result of color difference measurement, the color intensity increased as the concentration increased, but the increase was insignificant at high concentration. This tendency was more obvious in C.I. Disperse Orange 155 than in C.I. Disperse Yellow 42. The dye absorption rate also decreases as the concentration increases, but at 0.85% o.w.f concentration, C.I. Disperse Yellow 42 was 97.29% and C.I. Disperse Orange 155 was 93.77%. For both dyes, the wash fastness dropped by 0.5 to 1 class from the sample that was dyed at a concentration of 0.5% o.w.f in the wash fastness test.