• 소성∙가공
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• 제9권5호
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• pp.453-462
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• 2000

Tailor-welded blanks are used for forming of automobile structural skin components. The main objective of this study is to achieve weight and cost reduction in manufacturing of components. For successful application of tailor-welded blanks, design of initial welded blanks and prediction of the welding line movement are critical. The utilization of the backward tracing scheme of the finite element method shows to be desirable in design of initial welded blanks for net-shape production and in prediction of the welding line movement. First the design of the initial blank in forming of welded thick sheet with isotropy is tried, and it appears successful in obtaining a net-shape stamping product. Based on the first trial approach, the backward tracing scheme is applied to anisotropic tailored blanks. The welding line movement is also discussed.

• 전기학회논문지
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• 제61권6호
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• pp.910-915
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• 2012

In this paper we propose multi-grounded neutral design method which was considered of transferred transient overvoltage when line to neutral fault occurs. Specially, In order to confirm the actual transient overvoltage magnitude which occurs on neutral line, we considered some screening(shielding) effects. The screening coefficient was deducted from field test results and calculation in a distribution line which is identical with an actual power line. The purpose of this paper is to attempt to suggest the guidance for grounding skystem design considering limitation of overvoltage for LV side in IEC 61936. The result is based on EMTP simulation and real field faults situation in distribution lines.

• 한국의상디자인학회지
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• 제2권2호
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• pp.55-79
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• 2000

This study is the design research for the practical use of Casual Hanbok. The conclusion of basic research for Casual Hanbok design reads as follows. Today's college women are fairly positive to the practical use of Casual Hanbok. Especially, they are strongly interested in the new design and have the active intention to wear it on actually. The concrete design of every parts of Casual Hanbok which is wanted by college women is as follows. Firstly, college women like well matched two-piece dress style in colors. And they want to decide the coloration independently than to follow the traditional coloration passively. Secondly, according to the design of jacket, sometimes they like the presence of a collar, a collar strip, a gore etc. and at other times they like absence of them. Thirdly, the side line of jacket they like and the seam line of sleeve they like is smoothly curved one and the adjusting means they like is a fancy button. Fourthly, the length of jacket they like reaches to their waist and the width of an armhole they like must be convenient for moving of arm. Fifthly, one out of two college women likes mixed spinning fabrics as material for jacket, skirt, pants. In the other hand, one out of five college women likes cotton. Sixthly, the skirt style they like is A ­line one having from two to four gathers on the waist and the length of skirt they like reaches to their ankle or calf of the leg. Seventhly, the pants style they like is the western style but the hem line of pants is the korean traditional pants style.

• 한국의류학회지
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• 제24권7호
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• pp.976-986
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• 2000

The purpose of this study is to clarify the relationship between the visual sensibility and the decorative design of clothing. 41 kinds of costume samples have been selected from photographs in fashion magazines under detail and trimming, and divided into three types according to line, shape, and form. I have measured these images by using Semantic Differential method. The obtained data were analyzed by factor analysis ANOVA, discriminant analysis, regression analysis and MDS. The results of analysis are as follow; 1. Factor analysis has extracted five factors which consist of decorative design sensibility. These factors are Attractiveness, Hardness and Softness, Rhythm, Decorativeness, Cuteness. 2. There were significant differences in visual evaluation of decorative design and demographics 3. The discrimination among formative designs was closely related to decorative image, especially between line and form. 4. The Image effect on Preference, Buying needs, Riches and Pleasant was consist of complicated sensibility. 5. Evaluative dimensions of decorative design were identified by Simple-Complicated, Cubic -Plane perceptive image differed in degree of similarity in spite of same formative design.

• 항공우주기술
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• 제6권2호
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• pp.73-78
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• 2007

현재 개발되고 있는 위성용 전자광학시스템의 설계 파라미터를 적용하여 알려진 식에 의해 위성의 운용고도와 자세변화에 따른 전자광학시스템의 GSD 및 라인레이트 변화관계를 살펴보았다. 그리고 고도변화에 따른 적용 가능한 라인레이트와 위성의 지상 스캔율의 차이에 의해 발생할 수 있는 성능변화 요소로서의 MTF에 대한 영향을 검토하였다. 즉 현재 개발이 진행되고 있는 카메라 전자부의 설계 파라미터를 적용하여 조정 가능한 라인레이트의 한계를 알아보고 이에 의한 성능감소 변화를 검토함으로써 현재 개발 진행되는 전자광학시스템의 카메라전자부의 설계요소에 대한 분석을 수행하였다.

• 한국의류학회지
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• 제31권8호
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• pp.1310-1320
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• 2007

This study investigated the differences in the importance of store characteristics depending on on-line clothing store type and consumer age. The questionnaires were given to female residents in the ages between 20-39 in Seoul and Kyung-gi province during October 2006. The results were summarized as follows: 1. By analyzing the differences in importances of on-line store characteristics factors it was found that buying process service factor and product searching system factor were important in on-line general merchandise store. and buying process service factor and product factor(all the factors, such as store credit, product, screen-displayed design, searching and approaching system, customer management service) were important in on-line specialty store. 2. By analyzing the differences in importances of on-line store characteristics depending on the store type, buying process system such as refund policy, shipping, high-speed payment and rapid searching, screen-displayed design system, approaching and searching system were more important in on-line general merchandise store when comparing to specialty store. It also showed that the consumer considered the reputation of the store and its image more important in on-line general merchandise store. 3. By analyzing the differences in of on-line clothing store importance depending on age, in the case of on-line general merchandise store, it showed that people in their thirties regarded buying process service factor more important than twenties, and when it came to the product and searching system, it was vice versa. Twenties had a tendency to consider the aspect of product important and, relatively, thirties regarded searching and approaching system factor important. in the case of specialty store. It was found that women in their twenties had a tendency to consider product factor more important.

• 한국의류학회지
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• 제28권11호
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• pp.1536-1543
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• 2004

Garment is made by a 2D pattern and should be fitted to a human body which has 3D characteristics. Therefore, to design a pattern more effectively, the use of 3D information of a human body and the investigation of relationship between the 3D garment and 2D pattern are necessary. In this work, ruled surface method was used to reflect the 3D information of a human body for a pattern design. The images of the brassiere line on the woman's dress form were captured by phase-shifting projection moire system and the 3D information on the design line was obtained. 2D patterns on the various parts of the brassiere were developed directly from the 3D data by the ruled surface method. In addition, design line, the area and the amount of dart were quantified. And then we verify the appropriateness of the ruled surface method to the 2D pattern development by measuring the distribution of the space between women's figure and segmented clothing item. It was found that the ruled surface method is useful to transform the 3D design line to the 2D pattern, if we followed the steps suggested in this paper.

• 복식
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• 제61권4호
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• pp.152-168
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• 2011

The purpose of this study is to develop a design prototype of outdoor-wear which is suitable for trekking. For achieving this purpose, 6 factors(bodice, sleeve, hood, pockets, opening, hem-line) considered for clothing function were selected, classified, and complemented based on the survey of literature and the research of 185 designs in 12 outdoor-wear brands. The results are as follows; The removable hood and 4DM sleeve style with the elastic band and velcro for the cuffs was the most preferred in the detail design on the brand research. And also the ventilation function and 1 or 2 diagonal in-seam pocket, covered zipper was preferred. Based on this result, two design prototypes of men's outdoor-wear for trekking were suggested; jacket 1 has a slim waist line and a hip length. Front opening has a zip and placket for windproof effect. There is a detachable hood with stopper around the head line. 4DM sleeve and elastic band inserted at the end of sleeve, so that prevent the hem-line raising. Two inseam pocket is placed slightly diagonal. Jacket 2 is a hood jacket with a york. The Jacket has a little roomier in waist and a hip length. Front opening is fastened by a waterproof zip. It has a 4DM sleeve and a princess line to make it placed two pocket which have ventilation functionality.

• 한국철도학회논문집
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• 제12권3호
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• pp.427-436
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• 2009

본 연구는 철로를 신설 또는 확장 시 목표로 설정한 지표를 최적화시키는 최적 노선구간을 선정하여 철도망의 네트워크 효과를 고려하는 방법론인 철도망 설계모형(Railway Network Design Problem, RNDP)을 이용하여 설계속도 수준별 고속철도망의 노선축별 분석구간별 투자우선순위를 선정하였다. RNDP의 목적함수를 총 통행시간 최소화로 설정하여 분석한 결과 투자우선순위가 가장 높은 고속철도망 노선축은 서동축이며, 다음으로 서해축, 남해축 순으로 나타났다. 또한 노선축별 최적안은 서동축의 경우 전 구간을 400km/h급으로 신선을 건설하는 대안이, 서해축의 경우 전라선 익산$\sim$여수 구간을 200km/hr급으로 고속화하는 사업을 활용하고 이 구간을 제외한 나머지 신선 구간(송도$\sim$익산)을 400km/h급으로 건설하는 대안인 것으로 분석되었다. 마지막으로 남해축의 경우에는 경전선, 즉 순천$\sim$마산 구간을 200km/hr로 고속화하는 사업을 활용하여 나머지 신선 구간(목포$\sim$순천, 마산$\sim$부산)을 350km/h로 건설하는 대안인 것으로 분석되었다.

• Journal of Advanced Marine Engineering and Technology
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• 제38권8호
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• pp.995-999
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• 2014

In this paper, a new size-reduction approach for branch-line coupler is introduced which uses parallel end-shorted coupled lines with lumped capacitors. The characteristic of the new design was analyzed using even-odd mode method, and simulated on HFSS before fabricated on the FR4 epoxy glass cloth copper-clad plat (CCL) PCB substrate at center frequency of 1 GHz. The electrical length of transmission line was reduced to 15 degrees, therefore the size of branch-line coupler was largely reduced approximately maintaining the same characteristic around the stable center frequency. The insertion loss of the branch-line coupler filter was -4.39 dB. The size of the overall hybrid is $20mm{\times}20mm$. Measurements results were well agreed with the simulated ones.