• Title/Summary/Keyword: Structure improvement

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A Study on the Forming-analysis of Inner structured Design parameter (내부구조재의 설계변수에 따른 성형영향 분석)

  • Park J.H.;Choi D.S.;Jea T.J.;Kim H.J.
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 2005.06a
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    • pp.1547-1550
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    • 2005
  • ISB panel, inner structured of metal in two skin and bonded, has inner structures which have low relative density, stiffness and strength with low weight of make improvement for that purpose. A kind of Inner structures have various structure types. In this paper, we have studied the Forming Limit Diagram(FLD), thickness variation and stress strain to dimple structure of sheet by analysis of Dynaform and LS-Dyna.

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Study for Fatigue Life Improvement of Bulk Carrier (Bulk Carrier 피로수명 향상을 위한 형상 고찰)

  • Yun, Hye-Lim;Lee, Jeong-Ho;Nam, Hyung-Ju;Shin, Sung-Kwang
    • Special Issue of the Society of Naval Architects of Korea
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    • 2009.09a
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    • pp.87-92
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    • 2009
  • CSR for bulk carrier has been required 25 years operation life in North Atlantic condition. As the fatigue life requirement of ship structure is increased it is necessary to study to satisfy the fatigue life which is much severe. Therefore from the fatigue analysis, especially fatigue strength for double bottom & lower stool connection area is not enough. To satisfy the fatigue life, it needs to increase double bottom strength or insert thicker plate. In this study, the consideration though structure modification have been doe with 81K bulk carrier and to find the solution of fatigue problem.

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The Effect of Seed on Top-seeded Melt-growth (TSMG) Processing of a RE-123 Superconductor

  • O, Yong-Taeg;Sung, Tae-Hyun;Jeong, Nyeon-Ho;Kim, Chan-Joong;Shin, Dong-Chan
    • Progress in Superconductivity
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    • v.9 no.1
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    • pp.115-118
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    • 2007
  • This study investigated the effects of different kinds of seed crystals with miscut angles and pretreatment on the characteristics of a RE-123 superconductor processed by a top-seeded melt-growth (TSMG) method. When the seed crystal was heat-treated in an oxygen atmosphere, the surface structure was cleaned removing hydroxide. When the seed crystal had a miscut angle, in addition, the surface structure showed a well defined hill-and-valley structure after heat-treatment. A better microstructure, with a well-distributed small RE-123 phase, was obtained using a high miscut angle after heat-treatment in an oxygen atmosphere. As a result of the microstructure improvement, the magnetic characteristics also improved. The experimental result can be explained by reduction of nucleation activation energy.

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High Brightness Prism Light-guide Plate for TFT-LCDs Using Optical Simulation and Novel Injection Mold Process (광학시뮬레이션과 새로운 사출성형법을 사용한 TFT-LCD용 고휘도 프리즘 도광판)

  • Han, Jeong-Min;Shon, Jin-Geun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.61 no.2
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    • pp.93-96
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    • 2012
  • We have designed high performance prism light-guide plate (LGP) in 17 inch TFT-LCD. In test result to embody high brightness BLU in case of LGP of base and upper surface with 17 inch, thickness 8mm adding prism construct. Using optical simulation, we forecast the brightness and uniformity in LGP with prism structure. And we adopted novel injection mold method and Nickel stamper to make actual evolution sample. Novel injection mold process has steady heating time zone in heat cycle time of injection mold process. For this novel heat cycle control, we achieved above 90[%] height prism structure as our design. It is superior brightness improvement than previous that of printing form about some 20[%] and in this course to embody actual material it succeeded prism LGP production by 17 inch injection form process.

A Study on the Improvement of Structure System for the Flexible Unit Plan Designing in Apartment Housing (공동주택 단위주호의 융통성을 위한 구조방식의 개선에 관한 연구)

  • 박우장
    • Korean Institute of Interior Design Journal
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    • no.14
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    • pp.27-32
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    • 1998
  • Present structure design has a problem arising from the fact that present apartment housing design doesn't satisfy user's diverse demand. An aim of this study on searching out the alternative to solve this problem. The results of study are as follows : 1) Methods of flexible structure are analyzed to reflect user's needs and practical example of those proposed. 2) To raise the flexibility of design reinforced concrete pannel wall system are selected. The basic types of T and II for the figures of pannel are adopted. As a result it brought so much open space not having influenced on the load of construction that it enhances the flexibility of the space allocation. Also that made it easy to meet the user's demand for 8 kinds of plan types are easily designed according to the arrangement of the space and its scale. These results will become basic data of future unit plan design in apartment housing.

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Development of the Functional Shoe Apparatus using FEM (유한요소법을 이용한 기능성 신발 구조체의 개발)

  • Han, Kyu-Taek
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.12 no.3
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    • pp.89-95
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    • 2013
  • This study focused on the development on functional shoe apparatus so that the appropriate impact can be applied to the feet in order to improve the density of mineral bone at lower limbs. The model with structure proposed in this study had an effective stress about 20 to 100% higher by comparing that of the model without it among most of 15 bone extraction points. Though there is a limitation that the finite element analysis data from the human body model are not the value of mineral bone densities by measuring directly but the effective bone stresses against impact, the proposed structure is designed to influence the increase of bone mass and improve the density of mineral bone by effecting the improvement of the density of mineral bone actually.

A Study on the Development of Shoe Midsole Mold for Flash-less (플래시 발생 억제형 신발 중창 금형 개발에 관한 연구)

  • Hur Kwan Do;Yeo Hong Tae;Choi Young
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.1
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    • pp.109-114
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    • 2005
  • In this study, to develop a flash-less mold for forming of shoe-midsole, experiments and forming analysis were carried out. In order to reduce the extra-materials, the final preform has been modified by the experiment of pressure forming at the room temperature. To measure the contact status of parting surface of mold, the pressure film has been used. The midsole mold of the wedge structure type has been developed for the improvement of the contact status. The vertical pressing mold structure was introduced for the production of a flash-less midsole. By the investigation, flash of shoe-midsole was considerably reduced.

Protein Disorder Prediction Using Multilayer Perceptrons

  • Oh, Sang-Hoon
    • International Journal of Contents
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    • v.9 no.4
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    • pp.11-15
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    • 2013
  • "Protein Folding Problem" is considered to be one of the "Great Challenges of Computer Science" and prediction of disordered protein is an important part of the protein folding problem. Machine learning models can predict the disordered structure of protein based on its characteristic of "learning from examples". Among many machine learning models, we investigate the possibility of multilayer perceptron (MLP) as the predictor of protein disorder. The investigation includes a single hidden layer MLP, multi hidden layer MLP and the hierarchical structure of MLP. Also, the target node cost function which deals with imbalanced data is used as training criteria of MLPs. Based on the investigation results, we insist that MLP should have deep architectures for performance improvement of protein disorder prediction.

Design of a Microwave Active Resonator Using Defected Ground Structure with Islands (DGSI) (격리패턴을 지닌 결함접지구조를 이용한 초고주파용 능동공진기)

  • Hwang, Mun-Su;Oh, Seong-Min;Ahn, Dal;Lim, Jong-Sik
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.10
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    • pp.1814-1819
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    • 2007
  • A new active resonator using defected ground structure with islands (DGSI) is proposed. The proposed resonator is composed of the conventional microstrip line with DGSI and negative resistance of active devices. The negative resistance part is realized by field effect transistor (FET) series feedback circuits. The characteristic of the proposed resonator with DGSI is improved by combining the negative resistance part with the parallel microstrip line structure with islands, where the electric field is formed the most strongly. The measured improvement of the proposed active resonator with DGSI are 4.55dB and 0.32dB in S21 and S22, respectively, at the resonant frequency whorl it is compared to the existing passive resonator having DGSI only.

Analytical Study of Flexural Behavior on Steel Fiber Reinforced Concrete Structure (SFRC구조물의 휨거동에 관한 해석적 연구)

  • Seo, Seung-Tag
    • Journal of the Korean Society of Industry Convergence
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    • v.11 no.1
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    • pp.35-40
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    • 2008
  • Various characters of the concrete are greatly improved as the effect of the steel fiber. As the improvement effect of the steel fiber, the increment in flexural strength, shear strength, toughness, and impact strength are remarkable, and tenacious concrete is obtained. This paper presents model which can predict mechanical behavior of the structure according to aspect ratio and volume fraction of steel fiber. Experiments on compressive strength, elastic modulus and tensile strength were performed with self-made cylindrical specimens of variable aspect ratios. This paper presents an analytical study on the behavior of a beam specimen with steel fiber reinforced concrete(SFRC). The effect of the SFRC on the crack pattern, failure mode and the flexural behavior of the structure were investigated. The analysis model based on the nonlinear layered finite element method was successfully able to find the necessary amount of steel fibers, tensile steels and beam section which can best approximate flexural strength and ductility of a given conventionally reinforced concrete beam.

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