• Title/Summary/Keyword: 가중잔여

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A Study on the Dynamic Instability of Membrane Structures under Wind Action (풍하중을 받는 막구조물의 동적불안정 현상에 관한 연구)

  • Han, Sung-Eul;Hou, Xiao-Wu;Kong, Seok-Hwan
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2009.04a
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    • pp.500-503
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    • 2009
  • 본 논문에서는 이중곡률을 갖은 막구조물의 동적 불안정 현상을 연구하였다. 풍하중을 받는 막구조물의 지배방정식을 정식화할 경우 가장 중요한 것은 막 표면의 공기 압력을 합리적으로 산정하는 것이다. 베르누이 윈리에 의하여 유체 압력은 속도 퍼텐셜과 관계를 가지며 얇은 날개 원리에 의해 막 표면 공기의 움직임을 일련의 와류로 간주하고 속도 퍼텐셜을 구할 수 있다. 이 논문에서는 가장 많이 쓰이는 3 절점 삼각형 막요소를 이용하여 가중 잔여치 갤러킨법을 적용한 안정 평가의 판별식을 유도하였다. 임계 풍속에 대한 초기인장력, 풍방향과 곡률의 영향도 분석하였다.

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Robust inversion of seismic data using ${\ell}^1/{\ell}^2$ norm IRLS method (${\ell}^1/{\ell}^2$ norm IRLS 방법을 사용한 강인한 탄성파자료역산)

  • Ji Jun
    • 한국지구물리탐사학회:학술대회논문집
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    • 2005.05a
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    • pp.227-232
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    • 2005
  • Least squares (${\ell}^2-norm$) solutions of seismic inversion tend to be very sensitive to data points with large errors. The ${\ell}^p-norm$ minimization for $1{\le}p<2$ gives more robust solutions, but usually with higher computational cost. Iteratively reweighted least squares (IRLS) gives efficient approximate solutions of these ${\ell}^p-norm$ problems. I propose a simple way to implement the IRLS method for a hybrid ${\ell}^1/{\ell}^2$ minimization problem that behaves as ${\ell}^2$ fit for small residual and ${\ell}^1$ fit for large residuals. Synthetic and a field-data examples demonstrates the improvement of the hybrid method over least squares when there are outliers in the data.

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Power, mobility and wireless channel condition aware connected dominating set construction algorithm in the wireless ad-hoc networks (무선 에드 혹 네트워크에서 전력, 이동성 및 주변 무선 채널 상태를 고려한 연결형 Dominating Set 구성 방법)

  • Cho Hyoung-Sang;Yoo Sang-Jo
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.30 no.5B
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    • pp.274-286
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    • 2005
  • In this paper, we propose a new power-efficient and reliable connected dominating set based routing protocol in the mobile ad hoc networks. Gateway nodes must be elected in consideration of residual energy and mobility because frequent reconstruction of connected dominating set result in transmission error for route losses. If node density is high, it results in a lot of contentions and more delays for network congestion. Therefore, in this paper, we propose a new construction method of connected dominating set that supports reliable and efficient data transmission through minimizing reconstruction of connected dominating set by delaying neighbor set advertisement message broadcast in proportion to weighted sum of residual energy, mobility, and the number of neighbor nodes. The performance of the proposed protocol is proved by simulation of various conditions.

An Efficient Implementation of Hybrid $l^1/l^2$ Norm IRLS Method as a Robust Inversion (강인한 역산으로서의 하이브리드 $l^1/l^2$ norm IRLS 방법의 효율적 구현기법)

  • Ji, Jun
    • Geophysics and Geophysical Exploration
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    • v.10 no.2
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    • pp.124-130
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    • 2007
  • Least squares ($l^2$ norm) solutions of seismic inversion tend to be very sensitive to data points with large errors. The $l^1$ norm minimization gives more robust solutions, but usually with higher computational cost. Iteratively reweighted least squares (IRLS) method gives efficient approximate solutions of these $l^1$ norm problems. I propose an efficient implementation of the IRLS method for a hybrid $l^1/l^2$ minimization problem that behaves as $l^2$ norm fit for small residual and $l^1$ norm fit for large residuals. The proposed algorithm shows more robust characteristics to the decision of the threshold value than the l1 norm IRLS inversion does with respect to the threshold value to avoid singularity.

Study on Dynamic Instability of Plane Membrane Structures under Wind Action (풍하중을 받는 평면 막구조물의 동적불안정 판정에 관한 연구)

  • Han, Sung-Eul;Hou, Xiao-Wu
    • Journal of the Computational Structural Engineering Institute of Korea
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    • v.22 no.2
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    • pp.145-152
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    • 2009
  • In this paper, dynamic instability of plane membrane structures under wind action has been studied. The key to solving the governing equations of membrane structures under wind action is how to obtain the air pressure on membrane. Based on Bernoulli's theorem, fluid pressure has a certain relationship with velocity potential. Velocity potential could be solved according to thin aerofoil theory, where air around the membrane is regarded as a sheet of vortices. In this paper, we take advantage of the most commonly used three-node triangular membrane element and weighted residual-Galerkin method to obtain the determining equation for stability evaluation. Square and rectangular membrane structures are studied. The influence of initial prestressing force and wind direction towards critical wind velocity are also analyzed in this paper.

A Study on the operation cost of physical distribution system with operation strategy of inventory control (재고통제 운용전략이 물적분배시스템 운용비용에 미치는 영향에 관한 연구)

  • Kim Phoung-Chan;Yang Dae-Yong
    • Journal of the Korea Society of Computer and Information
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    • v.11 no.2 s.40
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    • pp.295-301
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    • 2006
  • An operational strategy for inventory control on finished goods in the distribution system has been given attention to many enterprises and many studies regarding this field have been done and is also on-going currently. It handling large scale of smallness type are so the requisition of customer which is various that over it continues more full scale merit. therefore, It is a tendency that many of enterprise is handling small scale of smallness type for environment change confrontation. but It is not easy for the enterprise to In customer demand diversification suiting because too need many cost. In addition, at enterprise charge extra weight because remainder inventory is causes of defective stock for a inefficient problem solution. this paper is rationalization of stock cost decrease for comparison evaluation of small scale quantify handling of singleness type and small scale quantity handling of largeness type.

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A Study on the Operation Strategy of Physical Distribution System of a Low Inventory Turnover Item (저회전 품목의 물적분배시스템 운용전략에 관한 연구)

  • Kim, Byeong-Chan;Yang, Hyo-Seok;Yang, Dae-Yong
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2008.06a
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    • pp.99-103
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    • 2008
  • An operational strategy for inventory control on finished goods in the distribution system has been given attention to many enterprises and many studies regarding this field have been done and is also on-going currently. It handling large scale of smallness type are so the requisition of customer which is various that over it continues more full scale merit. therefore, It is a tendency that many of enterprise is handling small scale of smallness type for environment change confrontation. but It is not easy for the enterprise to In customer demand diversification suiting because too need many cost. In addition, at enterprise charge extra weight because remainder inventory is causes of defective stock for a inefficient problem solution. this paper is rationalization of stock cost decrease for comparison evaluation of small scale quantity handling of singleness type and small scale quantity handling of largeness type.

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A Theoretical Review on the Intangible Assets Valuation Techniques of Income Approach (무형자산평가에 관한 이론적 고찰 - 소득접근법의 평가기법을 중심으로 -)

  • Ahn, Jeong-Keun
    • Journal of Cadastre & Land InformatiX
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    • v.45 no.1
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    • pp.207-224
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    • 2015
  • The purpose of this study is to review the various valuation techniques of intangible assets. The value of intangible asset by the income approach can be measured as the present value of the economic benefit over the intangible asset's remaining useful life. The typical methods used in intangible asset economic income projections include extrapolation method, life cycle analyses, sensitivity analyses, simulation analyses, judgment method, and tabula rasa method. There are several methods available for estimating capitalization rates and discount rates for intangible asset, in which we have discussed market extraction method, capital asset pricing model, built-up method, discounted cash flow model, and weighted average cost of capital method. As the capitalization methods for intangible asset, relief-from-royalty method, excess earnings capitalization method, profit split method, residual from business enterprise method, postulated loss of income method and so on have been reviewed.

Simultaneous Speaker and Environment Adaptation by Environment Clustering in Various Noise Environments (다양한 잡음 환경하에서 환경 군집화를 통한 화자 및 환경 동시 적응)

  • Kim, Young-Kuk;Song, Hwa-Jeon;Kim, Hyung-Soon
    • The Journal of the Acoustical Society of Korea
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    • v.28 no.6
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    • pp.566-571
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    • 2009
  • This paper proposes noise-robust fast speaker adaptation method based on the eigenvoice framework in various noisy environments. The proposed method is focused on de-noising and environment clustering. Since the de-noised adaptation DB still has residual noise in itself, environment clustering divides the noisy adaptation data into similar environments by a clustering method using the cepstral mean of non-speech segments as a feature vector. Then each adaptation data in the same cluster is used to build an environment-clustered speaker adapted (SA) model. After selecting multiple environmentally clustered SA models which are similar to test environment, the speaker adaptation based on an appropriate linear combination of clustered SA models is conducted. According to our experiments, we observe that the proposed method provides error rate reduction of $40{\sim}59%$ over baseline with speaker independent model.