• Journal of the Society of Naval Architects of Korea
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• v.35 no.4
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• pp.87-97
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• 1998

One of good ways to make a ship perform well in rough seas is to reduce its waterplane area and accordingly is subject to a reduced wave exciting forties. However, a great reduction of the waterplane area may create a penalty in speed performance due to the increased ratio of the wetted area to the displacement volume. This paper suggests a new catamaran hull form which compromises the speed and seakeeping quality by increasing the waterplane area somehow compared with that of the conventional SWATH ship. A 350 passenger carrying SWATH ship with a cruising speed of 30 knots in sea state of 4 has been developed and its performance was validated by the model tests. The design concept resistance performance and seakeeping dualities of the design craft are presented together with its comparative performance comparison with other high speed crafts.

• Journal of Korean Association for Spatial Structures
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• v.7 no.1 s.23
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• pp.71-78
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• 2007

Stainless steel is very famous for using of industrials structure and joint elements. Stainless steel wire drawing is one of the most ancient crafts. But there's not any standard size of tapered die during tile drawing. This paper was studied die angle and dimension of whole die by using AFDEX drawing simulator. Stress, metal flow and strain rate was analyzed by AFDEX tools during the wire drawing. So optimum data of during dies was taken from them. Simulation data was correspond with experimental data. The results of the optimum dies are shown that (1) Reduction angle is $13.8^{\circ}$ (2) Bark relief angle is $20^{\circ}$ (3) Bearing length is 0.7975mm (4) Bearing dia is 0.2393mm The research of the optimum result when the make dies is connected an enterprise. After researching, I hope that indirection effect creation make development situation of the manufactural technical, practical application of the other die size by the detail data, utility factor and economical efficiency.

• Polymer(Korea)
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• v.37 no.4
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• pp.437-441
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• 2013

A novel sulfonate flame retardant, 1,3,5,7-tetrakis(phenyl-4-sodium sulfonate)adamantane (FR-A), was successfully synthesized from 1-bromoadamantane in sequential four-step reactions involving Fiedel-Crafts phenylation, sulphonation, hydrolysis, and neutralization. The success of synthesis was confirmed by FTIR spectra, $^1H$ NMR spectra, elemental analyses and mass spectra. The effect of FR-A on the flame retardacy of polycarbonate (PC) has been studied. Limiting oxygen index (LOI) and thermogravimetric analysis (TGA) showed that this novel sulfonate flame retardant had effective flame retardancy on polycarbonate (PC). With a small amount (0.08 wt%) of FR-A, the flame retardancy of PC was improved obviously, which got to UL 94 V-0 rating. TGA and DTA curves demonstrated that the additive raised the degradation rate of PC by promoting the quick formation of an insulating carbon layer on the surface, and confirmed that the flame retardant mechanism of PC/FR-A system was similar to potassium diphenylsulfone sulfonate (KSS).

• Textile Coloration and Finishing
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• v.8 no.3
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• pp.52-58
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• 1996

In order to study an applicable level for the graft finish of silk filaments and the characteristics of silk fabric, some sample fabrics were woven with grafted weft and the characteristics of sample fabrics were analyzed to evaluate the mechanical properites and the handle values according to the graft yield(%) of MMA and HEMA monomers on silk filaments. 1. The tensile properties were detected in the increase of linearity(LT) and the recovery in time of the increasing resilience(RT). 2. The bending properties were detected to have a lot of effect on the balance of bending rigidity(B) to hysteresis(2HB) according to the elastic relaxation of warp tension and the interlacing stress. 3. The shearing properities were detected to show the softness and the elastics in a case of the decrease in shearing rigidity(G) and hysteresis(2HG, 2HG5) according to the graft yields. 4. The compression properties were detected in the decrease of linearity(LC) and the uniformity of resilience(RC). It explains that the tendancies of compressible variation is not accepted. 5. The surface properities were detected to be affected by the surface forms of grafted silk filaments and the variation in the morphologies of interlacing sections. Considering the interlacing eveness, MMA grafted fabrics were accepted within the level of WOMEN'S THIN DRESS(KN-201-LDY) but HEMA grafted fabrics were not accepted. 6. The variation of handles were detected in the increase of total hand(TAV) within the levels of 65% of KOSHI and 82% of HARI on the average. 7. The handle fashions were detected in the nature of Habuta and Dechine from MAA graft but the nature of Fugi were shaped from HEMA graft in proportion to the graft yields.

• Journal of the Korea Fashion and Costume Design Association
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• v.20 no.4
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• pp.1-16
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• 2018

This study focuses on the correlation between Kotgal and paper-folding. This paper first examines the meaning and history of Korean ancient Kotgal and then investigates relationship between Kotgal and Korean paper-folding culture which has been inherited in various ways. Throughout the study, literature research and analysis have been conducted along with empirical studies. The results of the study are as follows. First, it has been told that Kotgal was used a as a trident hat symbolizing the sky, land, and man, whereas Korean paper-folding is known as closely related to the folk beliefs which had existed since ancient times. From ancient times, the Korean ancestors expressed the Three Gods representing beauties of the nature, 'sky(Chun), land(Ji) and man(In)' on the conical hat and prayed for their wish to the heaven. Second, Kotgal has been evolved in various ways from ancient times through Goryeo and Joseon Dynasty to present. The form of Kotgal has begun with folding and this is closely related to the origin of Korean paper-folding, which is the Korean traditional craft. Third, the paper-folding tradition of Korea has been variously applied in the Korean culture such as rituals, life crafts and plays and expresses the unconventional philosophical concepts unique of Korea. In conclusion, this study evidently shows that the Korean philosophical ideas behind Kotgal which originated from ancient paper-folding are scientific and systematic.

• Korean Journal of Heritage: History & Science
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• v.50 no.3
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• pp.44-63
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• 2017

'Bukpo' is called 'Tongpo' or 'Balnaepo,' which respectively mean hemp fabric that goes into a small bamboo tube and women's table utensil 'bari' in Chosen. It is fine hemp fabric produced in Yukjin, Hamgyeong province. Korea has been divided into North and South since the Korean War in 1950. As it is hard to get information about Northern life style or their traditional technology, their hemp fabric production is also left unknown. This study demonstrates characteristics of the production of 'Bukpo' through "Ojuyeonmunjangjeonsango", the only document that marked about 'Bukpo' making process of the late Chosen dynasty. It aims to analyze the transition of the technique and the meaning by comparing the characteristics of the production of 'Bukpo' with the modern era's documents. In this process, I discovered that the hemp fabric production technique at 19th century shares some sort of similarities with that of Europe or Chinese Miao(hmong). But the hemp fabric production technique changed before the 20th century. The evolution of Northern hemp fabric production technique can be a good example to examine the context of the traditional craft technique.

• Journal of the Korea Society for Simulation
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• v.28 no.1
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• pp.57-65
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• 2019

Air refueling is expected to increase the efficiency of the air force operations. This follows from the introduction of air refueling aircraft, which should to increase operational time by increasing the range and duration of fighter jets. Despite the effectiveness of the air refueling air crafts, the astronomical costs of adapting the air tankers call for careful discussions on whether to acquire any air craft and if so, how many. However there is no academic study on the subject to our knowledge. Thus, we use the ABM(Agent Based Modeling) technique to calculate the optimal number of air tankers during patrol operation. We have enhanced the reliability of the simulation by entering the specifications of the current aircraft operated by the Korean Air Force. As an optimization tool for determining the optimal number of counts, we use OptQuest built into the simulation tools and show that the optimal number of air tanker is 4.

• Journal of Digital Convergence
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• v.19 no.8
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• pp.327-335
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• 2021

The tendency of the current times require education to focus on convergence, and the same applies to the essence of ceramics and design base imagination and creativity. For effective integration, a wide range of experimentations is required both in terms of academic and methodic approaches. This study analyzes the [TeamTeam Class] curriculum, converging ceramics with design initiated in the second semester (autumn semester) of 2020. Through reference materials on ceramics and design convergence education, it was possible to classify the following 5 categories: Subject, Method, Management, space and communication. The aim of the study is to find resolutions to overcome existing issues and problems in search of more effective methods. Although this study is based on convergence education, [TeamTeam Class] at Kookmin University, I hope to extend it further to also consider education after COVID-19.

• Journal of Digital Convergence
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• v.19 no.5
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• pp.407-414
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• 2021

This study will examine the relationship between women and art education between the 1910s and the 1930s, and how women broke down the feudalistic views on women by changing the perceptions of women and stepped into society through gendered art education. Women tried to restore dignity and realize freedom and equality between men and women through modern education. Nevertheless, women had to receive handicraft education for the cultivation of virtues as part of the Japanese colonial policy and returned to their traditional feminine role. However, this study aims to reveal how a small number of "new women" who studied in Japan took the lead in teaching handicrafts for the independence of women, and how they were officially recognized as in the arts and crafts community and was able to enter the exhibition space through records, interviews, and newspaper articles. In conclusion, this study hopes to provide an opportunity to examine the relationship between handicraft education and femininity, and to consider the role of art education and exhibition in the development of women into social beings.

• The Journal of the Korea Contents Association
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• v.20 no.12
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• pp.671-680
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• 2020

Today, if you don't reflect trends in developing new content crafts, you can't succeed in marketing. This is because the trend is the driving force that leads to the needs of consumers that come and go temporarily. The current market is changing and wants new lifestyle trends. As a trend of such latent desire, the purpose is to develop high-value-added interior vases using rice cake patterns and ceramic complexes. In the manufacturing method, the first rice cake patterns writing tool is stamped at a different angle from the top of the toremi board (a new term created above) written in the process of the pot work. A cylinder is made of a second potter's wheel, and after the outer wall is double-flavored, the cylinder is quickly rotated to be extended by pushing it from inside to outside by hand. The purpose of this vase is to develop a decorative vase with high added value by experimenting with various geometric patterns that are dismantled vertically and horizontally at a high speed with the static rice cake pattern stamped on the third, and then utilizing the various rice cake patterns developed in this way as the shape of a jar.