• Title/Summary/Keyword: Parametric Method

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Parametric Design System Basedon Design Unit and Configuration Design Method (구성 설계방법과 설계유니트를 이용한 파라메트릭 설계 시스템)

  • 명세현;한순흥
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.10a
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    • pp.702-706
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    • 1995
  • Integration of CAM and CAM information is important in the CIM era. For a CIM system, the feature representation can be a solution to the integration of product model data. These are geometry feature, functional feature, and manufacturing feature in the feature context. This paper proposes a framework to integrate the configuration design method, parametric modeling and the feature modeling method. The concept of design unit which is one level higher than functional feature and parametric modeling concept with functional features have been proposed.

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A Parametric Speaker Driving Technic Using MDSB Method. (MDSB 방식을 이용한 Parametric speaker 구동)

  • 안동순
    • Proceedings of the Acoustical Society of Korea Conference
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    • 1987.11a
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    • pp.17-19
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    • 1987
  • In this paper an ultrasonic loud speaker (ie,. parametric speaker) driving technic was proposed. The study was focused on reduction of distortion in self-demodulated sound using a sound source deriven by MDSB(Modified Double Side Band) signal. And, the esperiment was performed in acoustic wave guide usin the developed MDSB unit according to the variation of distance from the source. In the result, prposed MDSB method was found to decrease second harnonic distortion in -3 to -6 dB compared to conventional DSB method.

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Parametric Analysis and Measurement Guideline of Fresnel Region Antenna Measurement Method (프레넬영역 안테나 측정법의 파리미터 분석과 측정 가이드라인 제시)

  • Oh, Soon-Soo
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.351-352
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    • 2008
  • In this paper, parametric analysis of Fresnel region antenna measurement method has been performed for the square aperture having the uniformly distributed current. The optimum number of Fresnel region field and the tolerable distance between two antennas have been guided. This parametric analysis could be fully utilized when performing Fresnel region antenna measurement method. Other types of current distribution and aperture shape will be investigated in the near future

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Pose Estimation of 3D Object by Parametric Eigen Space Method Using Blurred Edge Images

  • Kim, Jin-Woo
    • Journal of Korea Multimedia Society
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    • v.7 no.12
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    • pp.1745-1753
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    • 2004
  • A method of estimating the pose of a three-dimensional object from a set of two-dimensioal images based on parametric eigenspace method is proposed. A Gaussian blurred edge image is used as an input image instead of the original image itself as has been used previously. The set of input images is compressed using K-L transformation. By comparing the estimation errors for the original, blurred original, edge, and blurred edge images, we show that blurring with the Gaussian function and the use of edge images enhance the data compression ratio and decrease the resulting from smoothing the trajectory in the parametric eigenspace, thereby allowing better pose estimation to be achieved than that obtainable using the original images as it is. The proposed method is shown to have improved efficiency, especially in cases with occlusion, position shift, and illumination variation. The results of the pose angle estimation show that the blurred edge image has the mean absolute errors of the pose angle in the measure of 4.09 degrees less for occlusion and 3.827 degrees less for position shift than that of the original image.

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Study on novel hierarchical parametric stereo coding method for Multichannel audio signal (멀티채널 오디오 신호의 계층적 코딩이 가능한 파라메트릭 스테레오 코딩 방법에 대한 연구)

  • Moon, Han-Gil
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.875-876
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    • 2008
  • Parametric stereo coding is a technique to efficiently code a stereo audio signal as a monaural signal plus small amount of parametric overhead to describe the stereo image. The stereo properties are analyzed, encoded, and reinstated in a decoder according to spatial psycho-acoustical principles. However, coding of multichannel audio signal using parametric stereo still requires considerable bit-rate. In this paper, enhanced parametric stereo coding for multichannel audio signal is proposed.

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The Parametric Fashion Design Using Grasshopper -Focused on Skirt Silhouette

  • Jung Min, Kim;Jung Soo, Lee
    • Journal of Fashion Business
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    • v.26 no.6
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    • pp.32-46
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    • 2022
  • The purpose of this study is to explore a three-dimensional (3D) simulation of skirt shape concepts by manipulating circumferences and lengths via parametric design in the fashion design concept stage. This study also intends to propose a modeling method that can judge and transform the shape through immediate parameter adjustment. We looked at cases that utilized parametric design in other fields of fashion design, reviewed and analyzed the variables used in each study, and constructed parameters suitable to implement skirt fashion design. The traditional design elements required for skirt design, namely waist and hip circumferences, were set as variables in this study. The parametric design was developed to generate ideas of two skirt silhouettes (tight and flared) and three lengths (mini, knee-length, and maxi). To apply the skirt design implemented through variables to the actual 3D human shape, the shape data of women in their 20s and 30s were randomly selected from the 5th human data of Size Korea. Skirt design silhouette modeling was performed by adjusting the variable values according to body type. Parametric design has the potential to help develop design ideas in the field of fashion design, considering the method and characteristics of parameters of the variety of variables and rapid modification. Furthermore, if systematic research on variables and options among fashion design elements is conducted, the possibility of converging them into customization or co-design fashion design processes could be confirmed.

Vibrations of a taut horizontal cable subjected to axial support excitations considering nonlinear quasi-static responses

  • Jiang Yi;Yingqi Liu
    • Structural Engineering and Mechanics
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    • v.86 no.2
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    • pp.221-235
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    • 2023
  • To calculate the vibrations of a tout cable subjected to axial support excitations, a nonlinear relationship of cable force and the support displacement under static situations are employed to depict the quasi-static vibration of the cable. The dynamic components of quasi-static vibration are inputted as "direct loads" to cause the parametric vibrations on the cable. Both the governing equations of motion and deformation compatibility for parametric vibrations are then derived, which indicates the high coupling of cable parametric force and deformation. Numerical solutions, based on the finite difference method, are put forward for the parametric vibrations, which is validated by the finite element method under periodic axial support excitations. For the quasi-static response, the shorter cables are more sensitive to support excitations than longer ones at small cable force. The quasi-static cable force makes the greatest contribution to the total cable force, but the parametric cable force is responsible for the occurrence of cable loosening at large excitation amplitudes. Moreover, this study also revealed that the traditional approach, assuming a linear relationship between quasi-static cable force and axial support displacement, would result in some great error of the cable parametric responses.

Cost Estimating in Early Stage Using Parametric Method for Apartment Construction Projects (파라메트릭 방법(Parametric Method)을 이용한 사업초기 단계의 공사비 예측 방법)

  • Seong, Ki-Hoon;Park, Mun-Seo;Lee, Hyun-Su;Ji, Sae-Hyun
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • 2008.11a
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    • pp.207-211
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    • 2008
  • The importance of cost management in early stage has been increasing due to market change and competition severence in construction industry. Because the adjustable budget is only 20% after finishing design stage, the critical decision is made in the early stage. However, in the early stage, the design information is not enough to make crucial decision. Therefore, this research suggests the predicting method on the purpose of accurate cost estimation. The parametric estimation is appropriate for the early stage, especially it has the strength of rapidity in cost estimation. This research analyzes 84 actual data of public apartment on the scale of $11{\sim}15$ stories, and then performs the correlation analysis between cost and influence factors. After eliminating the parameters which causes the problem of multicollinearity, this research derived the formula through the multi-regression analysis.

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A Study on The Parametric Design Method for Power Boat (파라메트릭 설계법에 의한 파워보트 설계를 위한 연구)

  • Jeong, Yo-Han;Yoo, Jae-Hoon
    • Journal of the Society of Naval Architects of Korea
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    • v.49 no.2
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    • pp.182-188
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    • 2012
  • The hull form design technique for high speed power boat based on the parametric design method is presented in this paper. While the design methods of conventional vessels that are currently in use have been well developed in various aspects from existing database. However, an easy and simple design program for high speed power boats needs to be provided for the relatively small boat builders who are in lack of experience and skilled manpower. This paper presents a parametric design technique which is aimed to provide an easier creation of a new model by inputting several parameters, such as angles and lengths, which correlate with hydrodynamics characteristic for high speed boats. The paper also introduces the prototype program developed to design power boat with parametric design technique.

A Macro Parametric Data Representation far CAD Model Exchange using XML (CAD 모델 교환을 위한 매크로 파라메트릭 정보의 XML 표현)

  • 양정삼;한순흥;김병철;박찬국
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.12
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    • pp.2061-2071
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    • 2003
  • The macro-parametric approach, which is a method of CAD model exchange, has recently been proposed. CAD models can be exchanged in the form of a macro file, which is a sequence of modeling commands. As an event-driven commands set, the standard macro file can transfer design intents such as parameters, features and constraints. Moreover it is suitable for the network environment because the standard macro commands are open, explicit, and the data size is small. This paper introduces the concept of the macro-parametric method and proposes its representation using XML technology. Representing the macro-parametric data using XML allows managing vast amount of dynamic contents, Web-enabled distributed applications, and inherent characteristic of structure and validation.