• Journal of the Optical Society of Korea
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• v.16 no.3
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• pp.288-291
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• 2012

We designed an ultra-wide band-pass filter applicable to microwave reflectometry for KSTAR (Korea Superconducting Tokamak Advanced Research) and to microwave photonics. The proposed ultra-wide band-pass filter exhibits a metamaterial structure characterized by a wide band, low insertion loss, and high skirt selectivity. The proposed filter is applied to enhance the linearity of reflectometry at the output of a VCO (voltage controlled oscillator). The pass-band of the proposed filter is observed at 18~28 GHz, and the out-of-band rejection is below 20 dB. Further, we constructed an unwrapped negative phase of S(2, 1) to verify the characteristics of the metamaterial. The under- and upper-band at lower limits of the pass-band are left- and right-handed, respectively. The group delay of the filter is less than 0.5 ns.

• Journal of the Korean Society of Clothing and Textiles
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• v.24 no.2
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• pp.226-236
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• 2000

The mutual relation dynamics between the chulik and the Po for man in the period of chosun dynasty. The objectives of this study are to find out the mutual relation between the chulik and the Po for man-symeui, danryeong, changeui, jikryeong-, te change of chulik, and the ideas that made this change. Conclusions are decribed as followes: 1. The pattern of chulik and symeui is same, and they consist of bodice and skirt's length of the chulik was 1 : 1.3∼2 and it is effected by symeui. And symeui was effected by pratical structure of the chulik. 2. The functions of the chulik were the underwear of danryeong and the upperwear as military uniform. And then the length of chulik was shorter than danryeong in the early period of shosun dynasty. The sleeves were changed as large as danryeong in the late period of chosun dynasty. It is assumed that the changes were to be a functional underwear and to appear authority as upperwear. 3. Chulik as the underwear was hardly worm in the 17th centuries, and changeui was widely enjoyed instead of it. The reason of this change is that the pragmatism was emphasied in that period. 4. Chulik was widly worm instead of court dress, until the mid of 17th century after war. It was effected by outer factor of the war. And jikryeong was widly worm instead of chulik in the late period of chosun dynasty. It shows that military officers wanted to appear authority.

• Nuclear Engineering and Technology
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• v.53 no.1
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• pp.93-102
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• 2021

The analysis of the fluid flow characteristics in reactor pressure vessel is an important part of the hydraulic design of nuclear power plant, which is related to the structure design of reactor internals, the flow distribution at core inlet and the safety of nuclear power plant. The flow distribution and mixing characteristics in the pressurized reactor vessel for the 1000MWe advanced pressurized water reactor is analyzed by using Computational Fluid Dynamics (CFD) method in this study. The geometry model of the full-scaled reactor vessel is built, which includes the cold and hot legs, downcomer, lower plenum, core, upper plenum, top plenum, and is verified with some parameters in DCD. Under normal condition, it is found that the flow skirt, core plate holes and outlet pipe cause pressure loss. The maximum and minimum flow coefficient is 1.028 and 0.961 respectively, and the standard deviation is 0.019. Compared with other reactor type, it shows relatively uniform of the flow distribution at the core inlet. The coolant mixing coefficient is investigated with adding additional variables, showing that mass transfer of coolant occurs near the interface. The coolant mainly distributes in the 90° area of the corresponding core inlet, and mixes at the interface with the coolant from the adjacent cold leg. 0.1% of corresponding coolant is still distributed at the inlet of the outer-ring components, indicating wide range of mixing coefficient distribution.

• Journal of Ocean Engineering and Technology
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• v.38 no.2
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• pp.74-85
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• 2024

Offshore wind turbines are supported by various foundations, each with its considerations in design and construction. Gravity, monopile, and suction bucket foundations encounter geotechnical issues, while jacket and tripod foundations face fatigue problems. Considering this, a gravity foundation based on a steel skirt was developed, and a monopile foundation was analyzed for Pile-Soil Interaction using the p-y curve and 3D finite element method (3D FEM). In addition, for suction bucket foundations, the effects of lateral and vertical loads were analyzed using 3D FEM and centrifuge tests. Fatigue analysis for jacket and tripod foundations was conducted using a hotspot stress approach. Some hybrid foundations and shape optimization techniques that change the shape to complement the problems of each foundation described above were assessed. Hybrid foundations could increase lateral resistance compared to existing foundations because of the combined appendages, and optimization techniques could reduce costs by maximizing the efficiency of the structure or by reducing costs and weight. This paper presents the characteristics and research directions of the foundation through various studies on the foundation. In addition, the optimal design method is presented by explaining the problems of the foundation and suggesting ways to supplement them.

• The Journal of Korean Institute of Electromagnetic Engineering and Science
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• v.17 no.2 s.105
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• pp.117-123
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• 2006

In this paper, a CPW lowpass filter with the spurious-reduced characteristic is designed by using DGS(Defected Ground Structures). By cascading two lowpass filters with different harmonic characteristics the spurious is reduced below - 15 dB. Additionally by combining a dumbbell shaped DGS to the filter we achieved a satisfactory spurious level of less than -25 dB to above three times cutoff frequency without any repeated passband. The fabricated LPF shows a compact size of $17.2mm{\times}6.8mm$, a cutoff frequency of 6 GHz, and a sharp skirt response of 7-order with two notch frequencies. The measured frequency responses agree well with simulated ones.

• Journal of the Korean Society of Clothing and Textiles
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• v.19 no.5
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• pp.747-764
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• 1995

The purpose of the present study were 1) to identify the dimensional structure of impression formed of a female figure, 2) to analyze effects of several elements of apparel design on impression formation of the figure in suit. The experimental materials developed for this study were a set of stimuli and a response scale. The stimuli consisted of 60 drawings made by identical manipulations of 3 indepndent variables in 3 clothing styles(suit, dress and pants with blouse). The independent variables were (1) five clothing colors (red, blue, yellow, white and black), (2) two lengths(short/long) of suit skirt, dress, and pants (3) two types of blouse and dress collars (shirt collar/ribbon collar). The 7-point semantic differential response scale to measure the dependent variables (formed impressions of the female figure) was composed of 37 bipolar adjectives. Further- more, two open-ended questions were used for interpretation of the reponses. The study proceeded in three independent experimental part was based on the 3 clothing styles using a 5(color)$\times$2(length)$\times$2(collar) factorial design. Subject were 200 female undergraduate students reandomly assigned to one of 20 combinations in each part of the experiment. The data were analyzed by factor analysis, 3-way ANOVA and Multiple Classification Analysis. Five factors emerged to account for the dimensional structure of impression of the female figure in specific attire. These factors included three basic dimensions of impression identified as potency, activity and evaluation, confirming the results of previous studies. Result from open-ended questionaire supported the theoretical perspective of Schneider, Hastorf and Ellsworth on the procedure of impression formation.

• The Research Journal of the Costume Culture
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• v.15 no.5
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• pp.902-915
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• 2007

This study examines decorative features found in the traditional costume of the Miao, one of the minority groups in China, and adapts them for the development of modern Korean-style fashion designs in order to present visual sample data and to introduce techniques. As for the research method, both literature and visual data are examined: the former includes Miao-related books and theses; the latter, pictures from various documents and real-life data in the possession of Seoul Women's University. The study result is as follows: 1. The basic structure of Miao costume is consist of a Caftan-type upper garment and an accentuated lower garment, pleats skirt although they are decorated luxuriously with various techniques such as delicate embroidery and dyeing. 2. Details and trimmings in modern shapes are developed and presented by adding modern materials to satin, twists, cross-stitch embroidery, stripe patterns, geometrical patchwork, machine pleats and smoking, trimmings of fringe & feather, and the border line decoration of coloration, braids, piping, embroidery, belts tied and wound with colorful threads. 3. Detachable accessaries such as front reinforcement strips, back reinforcement strips, belts, decorative aprons and patchwork skirts are developed and designed by adapting highlighted layered effects. 4. The silver decoration used as an necessary by the Miao is suitable for modern fashion design in futuristic sense. Various techniques and decorative features of Miao costume display their true value all the more in modern fashion stream in which ethnic trends draw much attention.

• The Research Journal of the Costume Culture
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• v.5 no.4
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• pp.68-79
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• 1997

In this thesis which takes fashion advertising that functions a marketing communication as an objective, I try to bear witness to the signifying system of garments though analyzing with semiotic methodology the signifying procedure on the base of the structural concept of Ferdinand de Saussure and the advertisement semiotic theory of Roland Barthes, to make clear their signifying structure and it meaning by understanding the characteristics of contemporary society and its cognitive system. Each sign of fashion advertising transfers the brand image through syntagmatic signification which contains the mythology of goods. Mannish style is encoded as tailored jacket, white shirt, H-silhouette and pants, non-color or being color, and it is presented as a clothing sign of casual wear for career women. Feminine style is encoded as X-silhouette, soutien collar suit style, various colors, and other details with womanly image, and it is presented as a clothing sign for maid or young wife 20\`s or 30\`s. Formal style is encoded as jacket vest, inner wear(blouse), two and three piece dress by pants or skirt and one-piece dress, and it is used in every age and class. Casual style is similar to formal style, but differs only in textile code. Clothing sign for housewives in middle age is encoded as H-silhouette of formal style, long jacket and pants and brown, being and grey colors. Contemporary popular phenomena in the signification of fashion advertising, and its temporal ideology reflected are as follows; According to the context of fashion advertising in the middle of 1990\`s, its fashion is that first, military look applied from the designs of various sort of military uniform and vest look and pant style applied from dandy-style imitated from man\`s wear are popuar. This mean that it reflects the change of point of view on woman\`s role in society today. That is, due to the equality between man and woman, it mirrors the ideology of feminism, and then, describes beautifully professional woman with carrer. Second, because that individualism is underlied for the change of consumer\`s consciousness, standardized popularity is disappeared, and in accordance with the mixture of various trends and personalities proposed every season, layered look that emphasizes individualism, easiness and naturalness is popular.

• Journal of the Korean Society of Costume
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• v.57 no.1 s.110
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• pp.105-117
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• 2007

The purpose of this study is to help the understanding the characteristics in the costumes of men and women throughout the overall acceptance process of 'Naewaebub' in the late 'Chosun Dynasty' in which the notion of 'Naewae' is more prosperous than any other period in Korean history. Originally the distinction between man and woman was not intended to display the high and the low but to show the mutual respect according to each duty. As time goes on, that ideal became gradually changed to heighten the man and lower the women especially in 'Han' period of China. There was the ideal of distinction in the ancient times in Korea. Until 'Koryo Dinasty' the community has the system of blood-tied that put together maternal and paternal. 'Karye' was introduced in the late 'Koryo Dynasty' and accepted to the stereotype of morale in the 'Chosun Dynasty' and there seemed to be 'Samgang' and 'Oryun' at once. Many restrictions was imposed to behavior in women like rules of prohibition in attending the temple and concealment of woman's face and was recognized to rule of distinction between man and woman. Confucian life custom has been settled to Korean society throughout the late 16th century and 17th century and there were some appearances in the housing construction which divide the residences of man and woman. The characteristics in the costume from the avoidance of opposite sexes are clear in the structure of clothes changed from similar style to different style. The examples of those characteristics are as fellows. The costume in man was developed to advanced 'Pyoun-bokkwan' and 'Pyounbokpo' as social action of man prospered. Meanwhile the trousers which had been the same in the man and woman were separated to different trousers between man and woman. The costume life style of woman was changed to using the a hair whirl, hiding the face in the street and overlapping the innerwear under the skirt which was extension of woman's closed life style in late 'Chosun Dynasty'.

• Journal of the Korean Institute of Telematics and Electronics D
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• v.36D no.12
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• pp.11-20
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• 1999

We have designed and fabricated direct-and gap-coupled microstrip hairpin-comb filters by patterning double-sided YBCO films on a single 50-mm-diameter, 0.5-mm-thick $LaAlO_3$ wafer. Both filters have a center frequency at 1.773 GHz, 12 MHz bandwidth, 0.5 dB minimum insertion loss in the passband, and very strong out-of- band rejection. Due to two attenuation poles below and above the passband, the direct-coupled hairpin-comb filter showed a better skirt characteristic than the gapcoupled hairpin-comb filter which had only one attenuation pole below the passband.