• Title, Summary, Keyword: Design Technique

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A multi-parameter optimization technique for prestressed concrete cable-stayed bridges considering prestress in girder

  • Gao, Qiong;Yang, Meng-Gang;Qiao, Jian-Dong
    • Structural Engineering and Mechanics
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    • v.64 no.5
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    • pp.567-577
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    • 2017
  • The traditional design procedure of a prestressed concrete (PC) cable-stayed bridge is complex and time-consuming. The designers have to repeatedly modify the configuration of the large number of design parameters to obtain a feasible design scheme which maybe not an economical design. In order to efficiently achieve an optimum design for PC cable-stayed bridges, a multi-parameter optimization technique is proposed. In this optimization technique, the number of prestressing tendons in girder is firstly set as one of design variables, as well as cable forces, cable areas and cross-section sizes of the girders and the towers. The stress and displacement constraints are simultaneously utilized to ensure the safety and serviceability of the structure. The target is to obtain the minimum cost design for a PC cable-stayed bridge. Finally, this optimization technique is carried out by a developed PC cable-stayed bridge optimization program involving the interaction of the parameterized automatically modeling program, the finite element structural analysis program and the optimization algorithm. A low-pylon PC cable-stayed bridge is selected as the example to test the proposed optimization technique. The optimum result verifies the capability and efficiency of the optimization technique, and the significance to optimize the number of prestressing tendons in the girder. The optimum design scheme obtained by the application can achieve a 24.03% reduction in cost, compared with the initial design.

Three-dimensional Decorative Techniques of Flower Image Represented on Valentino Dress (발렌티노 드레스에 표현된 꽃이미지의 입체적 장식기법)

  • Rha, Soo-Im
    • Journal of the Korea Fashion and Costume Design Association
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    • v.14 no.3
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    • pp.37-49
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    • 2012
  • The purpose of this study is to provide basic data of dress design by researching three-dimensional decorative techniques representing flowers, a popular motif in dress design. This study analyzed 44 dresses that were presented in Valentino collection. The result of this study is as follows: First, the detailing expression method can show various patterns and colors through embroidery technique, sub-materials, and bonding techniques in embroidery, beads flower, and ribbon flowers. Second, the fabric flower technique expressed flower image in three-dimension in more various images than do either the ribbon or beads flower technique. Fabric flowers are mostly made from the same material as dresses. The expression technique of fabric flower is classified into the following three classifications: 1) A technique underlying a flower image with one, two and three large flowers, 2) a technique decorating a large area with a number of an identical motif, and 3) a technique highlighting a part of the body or design line by attracting eyes to one point, creating a corsage decorated where a designer wants to emphasize. Third, a silhouette technique realizes a flower image with a silhouette of a dress like sculpted structure and it is thus used less than a detailing expression technique. A flower image is expressed by making use of body lines or emphasizing the face. Finally, flower images on a dress were realized as a full blossomed flower, through visually streamlined shapes and curved lines.

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A Study on Fashion Designs Applying Patchwork Technique and the Characteristics of Mondrian's Works (패치워크 기법과 몬드리안의 작품 특성을 응용한 패션 디자인 연구)

  • Seo, Yoon-Ju;Shon, Young-Mi
    • The Research Journal of the Costume Culture
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    • v.14 no.4
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    • pp.670-683
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    • 2006
  • Such trend offers new fashion designs as a formative art with creative spontaneity. The purpose of this study is to seek to work out fashion design methods whereby fashions can be developed into an art form embracing handicraft premium textures, geometric formativeness and traditional beauty so as to satisfy the individualist expression desires of modern people who pursue practicality, originality, and beauty of simplicity. This art form also allows new images to be expressed. The corresponding methods studied include the space and technique of patchwork that can create artistry and aesthetic functionality into differentiated levels of images, and geometric ion from Mondrian' works. Fashion designs based on patchwork technique and the characteristics of Mondrian's works reveal that the patchwork technique using diverse materials is an artistic technique with high handicraft value. This technique provides new value to traditional aesthetic materials of clothing, and that Mondrian's unique designs are very effective in developing new fashion designs because they provide artistry and unique effects to modern fashion expression.

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Pole placement technique for control design of DC-DC switchmode power converter (극점 배치 기법을 통한 DC-DC 컨버터의 제어 설계)

  • 조윤제
    • Proceedings of the KIPE Conference
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    • pp.480-484
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    • 2000
  • The pole placement technique for control design of the current mode controlled DC-DC switchmode power converter is proposed. It is compared with conventional transfer function analysis. Using the pole placement technique control design automation algorithm, by computer-based tool is presented. Control design example with large signal simulation is shown.

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A study on the behaviour of coupled shear walls

  • Bhunia, Dipendu;Prakash, Vipul;Pandey, Ashok D.
    • Structural Engineering and Mechanics
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    • v.42 no.5
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    • pp.645-675
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    • 2012
  • An effective design technique for symmetrical coupled shear walls is presented. Proposed formulation including assumptions and steps with mathematical formulation has been elaborated to make the design technique. An example has been considered to validate the technique with the DRAIN-3DX (1993) and SAP V 10.0.5 (2000) nonlinear programs. Parametric study has also been considered to find out the limitations along with remedial action of this technique. On the other hand, nonlinear static analysis is considered to determine the response reduction factor of coupled shear walls. Finally, it has been concluded in this paper that the proposed design technique can be considered to design the coupled shear walls under seismic motion.

Fundamental Study on the Improvement of the Educational Contents for the Presentation Technique in Interior Design (실내디자인 표현기법 교육내용 개선에 관한 기초 연구)

  • 이미경
    • Korean Institute of Interior Design Journal
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    • v.13 no.1
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    • pp.3-10
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    • 2004
  • The subject on presentation technique is the class which helps to develop the capability of sensual and creative acts to the students who major in interior design. It helps to understand plasticity and space through the theory of the light and the object, and to develop the capability which realizes one's idea to the actual and visual formations. It also enable the students to explain their designs to the customers by studying the technique which transfers 2D diagram to 3D presentation. Because of these objectives of the class, the departments which major in interior design in Korea consider the class on presentation technique as one of the mun subjects in basic curriculum. However, most of the textbooks related to the presentation technique published in Korea are in the lack of original characteristics for the field of domestic interior design since they refer to or employ the contents of architectural field by directly translating foreign articles. In addition, most of the classes on the presentation technique are taught not by professors but by lecturers so that the class objectives may be varied by their standards for the class. Therefore, it is not easy for each department to set up the one's own characteristics in the field of presentation technique. This study is to analyze the problems in the subjects of presentation technique by investigating the current situations for the subjects on presentation technique in domestic colleges and by surveying the personnels engaged in the field of domestic interior design. Also, the study has the objective to propose the development plan of educational program for the presentation technique in order to enable the student to effectively work in real business.

Fashion Accessory Design Using Hand-Knitting: - Focused on Necklace and Bangle Design - (니팅 기법을 이용한 패션 액세서리 디자인 - 목걸이와 팔찌 디자인을 중심으로 -)

  • Lee, Seung-A;Jekal, Mee;Jang, Jung-Im;Yoon, Jung-A;Kim, Soo-Young;Chung, Young-Sun;Lee, Youn-Hee
    • Journal of the Korea Fashion and Costume Design Association
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    • v.12 no.4
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    • pp.61-73
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    • 2010
  • The purpose of this study is to create unique formative beauty with free expressive method and to suggest accessory design with individuality through this, by using hand-knitting technique in design of necklace and bangle, which belong to personal ornament among fashion accessories. It analyzed on theoretical background of knit technique and accessory through documentary research, examined the accessory design tendency and the research tendency through collection materials, and then suggested 9 works in accessory ornament design of using hand-knitting technique, based on this. The results are as follows. First, even in overseas collection, accessories in diverse materials and shapes were being show cased. Volume in necklace or bangle was indicated to be big. There were many cases of covering several items together. Second, the hand-knitting technique in originative accessory design could be confirmed to be possibly used broadly in the range of pattern and shape available for making by using yarn in diverse thicknesses with proper technique, and by transforming basic tissue according to knitting technique. Third, through the results of making ornaments in 7 necklaces and 2 bangles, the hand-knitting technique was confirmed to possibly expanding the application range of knitting technique in the accessory field, and has significance in having suggested individual accessory.

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Study of Hybrid Optimization Technique for Grain Optimum Design

  • Oh, Seok-Hwan;Kim, Yong-Chan;Cha, Seung-Won;Roh, Tae-Seong
    • International Journal of Aeronautical and Space Sciences
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    • v.18 no.4
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    • pp.780-787
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    • 2017
  • The propellant grain configuration is a design variable that determines the shape and performance of a solid rocket motor. Grain configuration variables have complicated effects on the motor performance; so the global optimization problem has to be solved in order to design the configuration variables. The grain performance has been analyzed by means of the grain burn-back and internal ballistic analysis, and the optimization technique searches for the configuration variables that satisfy the requirements. The deterministic and stochastic optimization techniques have been applied for the grain optimization, but the results are imperfect. In this study, the optimization design of the configuration variables has been performed using the hybrid optimization technique, which combines those two techniques. As a result, the hybrid optimization technique has proved to be efficient for the grain optimization design.

A Study on the Design of Railway Electornic Interlocking Software Based on Real-Time Object-Oriented Modeling Technique (ROOM기법을 이용한 전자연동 소프트웨어 설계에 관한 연구)

  • Kim, Jong-Sun;Yoo, Ji-Yoon
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.50 no.9
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    • pp.439-446
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    • 2001
  • This paper considers the design technique of the real-time control algorithm to implement the electronic interlocking system which is the most important station control system in railway signal field. The proposed technique consists of the structure design and the detail design which are based on the ROOM(Real-Time Object-Oriented Modeling). The structure design is designed with a modeling using the heuristic search technique which, at first, catch and make out the specific requested condition, and then, is designed on the requested condition. The detail design can be implemented if it may get the satisfying values through the repetitive modeling after comparing and examining the data obtained from the structure design in order for the more reliable and accurate system to be implemented. The technique proposed in this paper is implemented with C++ language which is easy to be transferred and compatible with the existing interfaces, and also the operating system is designed and simulated on the VRTX which is a real-time operating system. This proposed technique is applied to the typical station model in order to prove the validity as verifying the performance of the modeled station.

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