• Title/Summary/Keyword: design method

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Optimal Design of a Planar-Type Antenna with a Reduced Number of Design Parameters Using Taguchi Method and Adaptive Particle Swarm Optimization

  • Lee, Jeong-Hyeok;Jang, Dong-Hyeok;Kim, Hyeong-Seok
    • Journal of Electrical Engineering and Technology
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    • v.9 no.6
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    • pp.2019-2024
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    • 2014
  • This paper presents a method to optimize the design of a planar-type antenna and reduce the number of design parameters for rapid computation. The electromagnetic characteristics of the structure are analyzed, and Taguchi method is used to identify critical design parameters. Adaptive particle swarm optimization, which has a faster convergence rate than particle swarm optimization, is used to achieve the design goal effectively. A compact dual-band USB dongle antenna is tested to verify the advantage of the proposed method. In this case, we can use only five selected geometrical parameters instead of eighteen to accelerate the optimization of the antenna design. The 10 dB bandwidth for return loss ranges from 2.3 GHz to 2.7 GHz and from 5.1 GHz to 5.9 GHz, covering all the WiBro, Bluetooth, WiMAX, and 802.11 b/g/n WLAN bands in both simulation and measurement. The optimization process enables the antenna design to achieve the required performance with fewer design parameters.

A Study on the expressional method of koreanity in modern interior architecture and design - based on domestic periodical publications since 1995 - (현대 실내 건축 디자인의 한국성 구현방법에 관한 연구 - 1995년 이후 국내 정기 간행물을 중심으로 -)

  • 김국선;오옥재;이은민;이연숙
    • Proceedings of the Korean Institute of Interior Design Conference
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    • 2003.05a
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    • pp.98-103
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    • 2003
  • Globalization and multi-culturalizm have put light on the importance of cultural identity. To find or establish cultural identity designers have made their effort in their practice. Understanding possible expressional method for cultural identity in this context koreanity, can be a basis to promote such activities. The propose of this study is to investigate expressional method of koreanity in interior design cases appeared which were introduced in major domestic periodical publications since 1995. 43 cases were analyzed by using the analysis frame of 4 expressional method , such as an indicative imitation method, a partial invoked method, a partial transformation method and a conceptual reception method. As result 47% of total cases were used the partial transformation method. 16% by the indicative imitation method, 7% by the partial invoked method and 30% by the conceptual reception method. This result indicated designers have had more active attitude in expressing koreanity with interpretation of traditional concept in a contemporary way, rather than simply introducing and immitating traditional object. Design examples were organized and explained according to expressional method types.

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Shape Design of Micro Electrostatic Actuator using Multidimensional Design Windows (다차원 설계윈도우 탐색법을 이용한 마이크로 액추에이터 형상설계)

  • Jeong, Min-Jung;Kim, Yeong-Jin;Daisuke Ishihara;Yoshimura, Shinobu;Yagawa, Genki
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.25 no.11
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    • pp.1796-1801
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    • 2001
  • For micro-machines, very few design methodologies based on optimization hale been developed so far. To overcome the difficulties of design optimization of micro-machines, the search method for multi-dimensional design window (DW)s is proposed. The proposed method is defined as areas of satisfactory design solutions in a design parameter space, using both continuous evolutionary algorithms (CEA) and the modified K-means clustering algorithm . To demonstrate practical performance of the proposed method, it was applied to an optimal shape design of micro electrostatic actuator of optical memory. The shape design problem has 5 design parameters and 5 objective functions, and finally shows 4 specific design shapes and design characters based on the proposed DWs.

Comparison Study of H-infinity Controller Design Algorithms for Spacecraft Attitude Control (인공위성 자세제어를 위한 H-infinity 제어기 설계 알고리즘 비교 연구)

  • Rhee, Seung-Wu
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.44 no.1
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    • pp.57-69
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    • 2016
  • There are three kinds of algorithms(2-ARE, mu-synthesis, LMI) for controller design using closed-loop shaping method. This paper provides the summary of background theory of three algorithms and $H_{\infty}$ controller design results for spacecraft attitude control using the three controller design tools of Matlab$^{TM}$ Toolbox for comparison. As a result, it reveals that LMI design method is more reliable as well as easier than others for spacecraft attitude control design. Comparison results are as follow: 2-ARE method and LMI method provide almost same results in robust stability, robust performance and control authority level. But 2-ARE method is more sensitive than LMI method with respect to proper design of weighting functions: 2-ARE method is more difficult than LMI method in weighting function design. The design result of mu-synthesis method shows worse performance and requires bigger control authority than others.

Proposal of Return Period and Basic Wind Speed Map to Estimate Wind Loads for Strength Design in Korea (강도설계용 풍하중 평가를 위한 재현기간과 기본풍속지도의 제안)

  • Ha, Young-Cheol
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.34 no.2
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    • pp.29-40
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    • 2018
  • Strength design wind loads for the wind resistance design of structures shall be evaluated by the product of wind loads calculated based on the basic wind speed with 100 years return period and the wind load factor 1.3 specified in the provisions of load combinations in Korean Building Code (KBC) 2016. It may be sure that the wind load factor 1.3 in KBC(2016) had not been determined by probabilistic method or empirical method using meteorological wind speed data in Korea. In this paper, wind load factors were evaluated by probabilistic method and empirical method. The annual maximum 10 minutes mean wind speed data at 69 meteorological stations during past 40 years from 1973 to 2012 were selected for this evaluation. From the comparison of the results of those two method, it can be found that the mean values of wind load factors calculated both probability based method and empirical based method were similar at all meteorological stations. When target level of reliability index is set up 2.5, the mean value of wind load factors for all regions should be presented about 1.35. When target level of reliability index is set up 3.0, wind load factor should be presented about 1.46. By using the relationship between importance factor(conversion factor for return period) and wind load factor, the return periods for strength design were estimated and expected wind speeds of all regions accounting for strength design were proposed. It can be found that return period to estimate wind loads for strength design should be 500 years and 800 years in according to target level of reliability index 2.5 and 3.0, respectively. The 500 years basic wind speed map for strength design was suggested and it can be used with a wind load factor 1.0.

Wind design spectra for generalisation

  • Martinez-Vazquez, P
    • Wind and Structures
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    • v.30 no.2
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    • pp.155-163
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    • 2020
  • Previous research has shown that wind acceleration components produce a signal that can vibrate single-degree of-freedom oscillators, whose dynamic responses enable to configure design spectra for structures subject to wind. These wind design spectra present an alternative method for evaluating the dynamic response of structures and are a suitable tool for running modal analyses. Here, a generalised method for producing wind design spectra is proposed. The method consists of scaling existing spectra to adjust to a wider range of building properties and terrain conditions. The modelling technique is tested on a benchmark building to prove that its results are consistent with experimental evidence reported in the past.

Sensitivita Analysis and Optimal desing of plane Vehicle Frame Structures (평면 차체프레임구조물의 민감도해석 및 최적설계)

  • 이종선
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.5 no.4
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    • pp.74-81
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    • 1996
  • This paper is to estimate sizing design sensitivity of linear and nonlinear vehicle frame structure using structural ananlysis result from ANSYS. Using design sensitivity results, optimal design of plane vehicle frame structure with buckling constraint is carried out the gradient projection method. Optimal design results are compares gradient projection method resrult with SUMT result.

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Review of Design Guide and Case Study on Bored Prefabricated Piling Method in Architectural Building Foundation (건축기초에서의 매입말뚝 설계기준 및 사례)

  • Lee, Won-Je
    • Proceedings of the Korean Geotechical Society Conference
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    • 2008.10a
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    • pp.549-558
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    • 2008
  • Well known and widely used in urban area and limited installation condition, a low noise and vibration piling method which has being called Bored Prefabricated Piling Method was reviewed in terms of design guide, and introduced a few case as well. Among the areas being applied of that method, a structural guide of architectural foundation was reviewed and compared to civil engineering foundation area to provide wider information for the foundation engineers. With introducing a few case application including pile load testing review especially dynamic testing in normal building foundation work, engineers may have a useful information on the design and construction of the piling method even different engineering area. It may also make enhancement a view of foundation engineering knowledge to various pile foundation area.

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Design of ferromagnetic shims for an HTS NMR magnet using sequential search method

  • Yang, Hongmin;Lee, SangGap;Ahn, Minchul
    • Progress in Superconductivity and Cryogenics
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    • v.23 no.4
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    • pp.39-43
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    • 2021
  • This study deals with the ferromagnetic shims design based on the spherical harmonic coefficient reduction method. The design method using the sequential search method is an intuitive method and has the advantage of quickly reaching the optimal result. The study was conducted for a 400 MHz all-REBCO magnet, which had difficulty in shimming due to the problem of SCF (screening current induced field). The initial field homogeneity of the magnet was measured to be 233.76 ppm at 20 mm DSV (Diameter Spherical Volume). In order to improve the field homogeneity of the magnet, the ferromagnetic shim with a thickness of 1 mil to 11 mil was constructed by a design method in which sequential search algorithm was applied. As a result, the field homogeneity of the magnet could be significantly improved to 0.24 ppm at 20 mm DSV and 0.05 ppm at 10 mm DSV.

A Study on Interior Design Process by approaching Typological Method (유형학적 접근방식에 의한 실내디자인 과정에 관한 연구 (II))

  • 한경희;이선민
    • Korean Institute of Interior Design Journal
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    • no.21
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    • pp.165-172
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    • 1999
  • For the useful method capable of modern expression on traditional residence architecture, a study was performed on the methodological establishment and possibility of typological method could be examinated to interior design process by typological method. First of all, through the establishment verbal of our Korean traditional architecture and further investigation of environmental and cultural idealogical facts, it could be extracted from natural instinct, duality, continuance, flexibility and transitiov. In second process, based on these results, it could be framed and described the individual typological language and, for the sake of drawing for visual and spatial typology, it was made by sketch in terms and view of possibile guidance of prototype, transforming and application method. from these results of investigated sketches, it cold be used for criteria of application method as the parts of visual and spatial typological elements to have an applicable expression of it/s traditionality. Based on above facts, for the subjects of spatial system, form & shape system, circulation system, order system, decoration system, color & material system in interior design fields, we cold propose the practical possibility through the consideration of application method for built-in meaning that could be adaptable for the interior design practices. These facts were extracted from the based on visual & spatial typology, as above mentiov. Also, through preparing and suggesting the criteria of evaluation and measurement of design quality , we could propose the applicable methodology for further & basically Korean traditional embodiment.

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