• Korean Journal of Computational Design and Engineering
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• v.12 no.5
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• pp.354-365
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• 2007

We present novel methods to generate a sequence of shapes that represents the pattern of morphological development or transformation of Bezier curves. The presented methods utilize the intrinsic geometric structures of a Bezier curve that are derived from rib and fan decomposition (RFD). Morphological development based on RFD shows a characteristic pattern of structural growth of a Bezier curve, which is the direct consequence of development path defined by fans. Morphological transformation based RFD utilizes development patterns of source and target curves to mimic the theory of evolutionary developmental biology: although the source and target curves are quite different in shapes, we can easily find similarities in their younger shapes, which makes it easier to set up feature correspondences for blending them. We also show that further controls on base transformation for intensity of feature blending, and extrapolation can compensate the immaturity of blended curves. We demonstrate the experimental results where transformation patterns are smoother and have unique geometric style that cannot be generated using conventional methods based on multi-linear blending.

• Geomechanics and Engineering
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• v.38 no.2
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• pp.179-189
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• 2024

This paper presents a geomechanical framework for designing and optimizing layout patterns of cutterheads for rock Tunnel Boring Machines (TBMs), aiming to enhance their engineering performance. By examining the forces and moments exerted by rock, the study addresses geometric constraints associated with cutter boxes in key regions of the cutterhead, including the center, face, and gage areas, as well as the three-dimensional effects of cutterhead curvature on the geometric constraints of the back of the cutter boxes in the gage area. Novel formulas are proposed for determining the center points of cutter boxes and calculating both the minimum angular spacing and distance spacing between consecutive cutter boxes along a spiral path. The paper outlines an optimized layout design process for four cutterhead configurations: random, random paired, radial, and double spiral designs. Examples are provided to illustrate the results of applying these designs. The findings underscore the efficacy of the proposed methods in achieving a uniform and symmetrical distribution of cutters and buckets on the cutterhead surface. This approach effectively eliminates boundary overlap and minimizes unbalanced forces and moments. From a geomechanical standpoint, this framework offers a robust strategy for enhancing the performance and reliability of TBM cutterheads in rock tunneling operations.

• Journal of the Korea Fashion and Costume Design Association
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• v.24 no.4
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• pp.117-133
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• 2022

In order to reflect traditional elements in modern design, designers should be able to creatively apply elements of traditional Chinese clothing. To understand this, a deep understanding of and insights into the traditional clothing culture are required. In this study, the characteristics of traditional Chinese women's clothing from the Wei, Jin, and Northern and Southern Dynasties of China to the Qing Dynasty were analyzed by dividing them into silhouette, color, pattern, materials, and detail. The characteristics of the silhouette were classified into A, H, X, and O types, of which types A and H were the most common. As for the color characteristics, there are relatively many five cardinal colors, and for the contrast of colors complementary colors were mainly used. As the for pattern characteristics, real patterns, animal patterns, character patterns, geometric patterns, and mixed patterns were used. Four types of materials were mainly used: silk, hemp, cotton, and wool. The detail characteristics were also anlyzed by classifying them into collar, sleeve, neckband, and gusset. Based on the results of this analysis, a satisfaction survey was conducted on the design of modern Chinese women's clothing. The result of satisfaction with design elements showed that the images of vest and suit were most preferred, H and X silhouettes, and yellow and white were the most preferred. Geometric and plant patterns were preferred, as were silk and acetate materials. Based on the result of chi-square analysis of design element preferences according to the characteristics of the subject, there was no difference according to occupation, residential area, or income, and there were differences in silhouette, color, materials, and detail according to age.

• Journal of Fashion Business
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• v.11 no.6
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• pp.139-156
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• 2007

The purpose of this study is to analyze the aesthetic characteristics of traditional Korean patterns appearing on fashion collections from 1990 to 2005. Traditional Korean patterns have been used as an important element to express a Korean image since the 1990s. Frequently used patterns included several kinds of geometric patterns, plant patterns(flower, peony, Four Gracious Plants), and Chinese character patterns. Specifically, since the 2000s, animal patterns such as tiger, Chinese phoenix, and giraffe which were not often used, plant patterns such as arabesque, peony, and flower, and a variety of Chinese character patterns appeared. For the expression techniques, while embroidery and printing was often used in the 1990s, they became varied into printing, beading, embroidery, gold and silver leaf, and hand painting after 2000 as a result of designers' active attempts. The aesthetic characteristics of fashion design with its focus on traditional patterns were analyzed. First, Chinese character patterns and phoenix pattern which were mainly used for a court suit, and show the excellence and unique originality of Korean culture. Second, traditional Korean patterns directly and indirectly imply symbolistic significance of lucky sign and illustrate the use of various lucky sign patterns. Third, traditional Korean patterns such as arabesque or peony were expressed by colorful embroidery to add decorative beauty. Finally, traditional Korean patterns reflect a naturalistic worldview and are completed finished as the design.

• Journal of the Korean Society of Costume
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• v.13
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• pp.51-72
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• 1989

In this thesis, I examined the mental, philosophical aspects and the aesthetic sense of our ancestors through the study of the patterns pictured in the mural paintings of Koguryo dynasty's old tomb. To view the mode of construction in Koguryo dynasty from present angle, the detailed analysis of the patterns was done. As a result, I could fully understand the formative consciousness of our nation. 1. I defined the process of transition of the mural paintings by putting some 70 mural aintings into the form of a diagram. 2. The cultural aspects of the mural paintings in Koguryo dynasty were characterized by the fusion of our primitive religion and Buddhism, Confucianism and Taoism which were introduced from China. From this fact, I could inferred that Koguryo people were giving off the strong desire for the faith by means of the mural paintings. Further more I found that configuration of the patterns such as religious elements. 3. The types of the patterns were classified into four types, this is, geometric type, natural type, cultural type and abstract type, Among these types, geometric type and natural type were nonsymbolic in nature but became cultured and abstracted in course of time. cultural pattern and abstract pattern got the symbolic meaning in the long run. Of all the constitution of the patterns represented in the mural paintings such as repeat constitution, left and right symmetric constitution, top and bottom symmetric constitution and rotary symmetric constitution, the left and right symmetric constitution was mainly used and some monotony of left and right symmetric constitution. The analysis of motif which was got from the mode of the patterns showed that the mixing of symbolic and nonsymbolic patterns made it possible to regard the separate symbol as compound in nonsymbolic patterns and the combination between nonsymbolic patterns ensured the understanding of other patterns in certain cases. Our ancestors made great efforts to transmit certain meaning symbolically. Also to heighten the symbolism, they drew the meangless patterns firstly and then appended meaning to those patterns secondly. Furthermore, they offered the background to the patterns comblined with symbolism, so that meaning transmission was clarified at last. As mentioned above, the patterns shown in the mural paintings of Koguryo dynasty's old tomb were characterized by natural beauty. And natural beauty was found out clearly in the form and constitution of the patterns. Therefore I concluded that our nation's religious, philosophical tradition was acted on the patterns strongly.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.46 no.6
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• pp.58-67
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• 2009

A correspondence matching is one of the important tasks in computer vision, and it is not easy to find corresponding points in variable environment where a scale, rotation, view point and illumination are changed. A SURF(Speeded Up Robust Features) algorithm have been widely used to solve the problem of the correspondence matching because it is faster than SIFT(Scale Invariant Feature Transform) with closely maintaining the matching performance. However, because SURF considers only gray image and local geometric information, it is difficult to match corresponding points on the image where similar local patterns are scattered. In order to solve this problem, this paper proposes an extended SURF algorithm that uses the invariant color and global geometric information. The proposed algorithm can improves the matching performance since the color information and global geometric information is used to discriminate similar patterns. In this paper, the superiority of the proposed algorithm is proved by experiments that it is compared with conventional methods on the image where an illumination and a view point are changed and similar patterns exist.

• Journal of the Korea Fashion and Costume Design Association
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• v.22 no.1
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• pp.15-32
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• 2020

This study aims to develop contemporary fashion designs from the unique Yao minority costumes and to explore the possibility of developing creative designs by using knitting materials. The research method is based on the cultural clothing and costumes of the Chinese ethnic minority, as well as literature concerning the Yao costumes and photo data to investigate the cultural background and characteristics apparent in Yao costumes. The overall design characteristics of Yao costumes are as follows. First, the shape of Yao costumes are divided into straight-lined short tops with pleated skirts or shorts, or cardigan tops with pants and aprons, or long shirts, pants, and a belt. Each variant of tribal clothing is different. Second, the colors used are mainly black or dark blue, and these are accented by other colors, such as red, orange, yellow, green, blue, and white. Third, the clothing patterns are mainly in plant, animal, natural, geometric, and human, etc. motifs. The most common patterns in daily life are the patterns using geometric shapes, plants, or animals. Using the background of the unique lifestyles of the Yao ethnic minority, this study applied hand knitting and jacquard techniques for a knit fashion design. In order to develop traditional patterns, Yao patterns were entered into an Illustrator and SDS-ONE APEX3-4 was used for simulation. Using wool fibers as the raw material; the knitting machine used a Bird's eye Jacquard technique-10GG. The results of this research and design work were as follows. First, the knitted clothing design using Yao clothing elements has significance for the development and flexible use of ethnic elements in contemporary creative design. Second, the straight cut design using hand-knitted and jacquard-knit fabrics can minimize waste materials and provide more possibilities for sustainable design development. Third, it provides additional methods for the combination of hand-knitting and jacquard knitting fashion design.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.23 no.11 s.170
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• pp.1896-1903
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• 1999

The basic requirements to improve the joints quality of tube-to-tubesheet for heat exchangers are to obtain high residual contact pressures between the tubes and the tubesheet as well as low residual stresses in the transition zone of the tubes. The residual contact pressures and residual stresses which govern the joint quality are influenced by parameters such as material properties, geometric dimension of tube and tubesheet and expansion pressures. There are two types of tube layout patterns, triangular and square, which are frequently used for heat exchangers. The purpose of the present work is to examine the superior tube layout patterns considering the joints quality by comparing numerical results from sensitivity analyses which were performed for both of tube layout patterns.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.300.2-300.2
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• 2013

Periodically shaped pillar-arrays and hole-arrays were fabricated on a Si wafer. Geometric features are similar in a periodic length of 4 ${\mu}m$ and a depth of 2 ${\mu}m$. For the hole-array patterns, positive PR processes were performed. UV exposed PR patterns were removed during a developing process to leave shapes of inversely replicated from a glass photomask. Meanwhile, negative PR processes were taken for the pillar-array patterns. UV exposed PR patterns were remained on a Si substrate having a same feature of patterns of a glass photomask. For an electrical aspect, a pillar structure has a short carrier-collection length resulting in the improved open-circuit voltage of 609 mV from 587 mV of a planar device. An improved performance may be achieved to reduce recombination loss along the patterning surface.

• Korean Journal of Human Ecology
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• v.15 no.2
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• pp.303-316
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• 2006

The present study deals with developing a new modem design of quilt which is characteristic of Korean traditional patterns. The goal of this study is to make some samples of the pattern as a basic motive of quilt work by using some Korean traditional patterns that could be found in roof tiles, windows, Neung-Hwa (a kind of wood cut for printing book covers), and others. This study examines the concept of quilts, their historical background, and their characteristics. This study also examines traditional patterns that are applicable to the patchy work of quilt, discussing the characteristic of both the Korean patterns and Nubi (Korean traditional quilt). In the process of pattern development, the original patterns were simplified and transformed to apply them to the modem quilt pattern. Fabrics (100% cotton) of similar colors were used to emphasize quilting lines. This study has found followings; 1) The geometric pattern usually consists of dots, lines, and faces. These patterns are suitable for pieced quilts. 2) The curvilinear pattern found in roof tiles or Yi-Dynasty coins, can be easily re-expressed by the applique technique. Combinations of fabrics and motive compositions can express quilts in realistic and creative ways. 3) Addition of Korean traditional quilt techniques, such as parallel lines or swastika stitches, to the traditional object-derived quilt patterns led to the creation of images close to the already existing Korean quilt, Nubi.