• Title/Summary/Keyword: 가중계수

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A study on the calculation of stress intensity factor for a patched crack using approximate weight function (근사적 가중함수를 이용한 보강된 균열평판의 응력강도계수 계산에 대한 연구)

  • Kim, Jong-Ho;Lee, Soon-Bok
    • Proceedings of the KSME Conference
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    • 2000.11a
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    • pp.123-128
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    • 2000
  • A cracked-plate with a patch bonded on one side is treated with a crack-bridging model: assuming continuous distribution of springs acting between crack surfaces. the approximate weight function was introduced to obtain the stress intensity factor of patched crack subjected to residual stress or non-uniform stress. The stress intensity factors for the partially patched crack within finite plate or the patched crack initiated from a notch were successfully obtained by numerical calculation.

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Channel Estimation Based on the Weighted Moving Average in T-DMB Receivers (T-DMB 수신기에서 가중이동평균을 기반으로 한 채널추정)

  • Park, Sung-Ik;Lee, Jae-Yong;Lim, Hyoung-Soo;Kim, Hyoung-Nam;Kim, Heung-Mook;Lee, Jong-Soo
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2006.11a
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    • pp.153-156
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    • 2006
  • 본 논문에서는 T-DMB 수신기의 채널추정 성능향상을 위한 잡음감소 기법을 제안한다. 일반적으로 T-DMB 수신기에서의 채널추정은 파일럿 신호 추출과 채널계수 추정에 의해 수행된다. 채널추정의 성능은 수신 SNR (Signal to Noise Ratio)과 연관되어 추정된 채널계수에 남아있는 잡음성분에 의해 결정되기 때문에, 잔존하는 잡음성분을 감소시키는 것은 매우 중요하다. 이러한 잡음성분을 감소시키기 위해, M-point 가중이동평균(weighted moving average)을 기반으로 한 잡음제거 기법을 제안한다. 전산 실험에 의하면, 제안된 방법은 등화 후 SER (Symbol Error Rate) 측면에서 기존의 방법에 비해 2-3 dB의 성능 향상을 보인다.

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물가지수의 가중치 추정모형: 물가지수체계의 연관분석적 평가법(속)

  • 김준보
    • Journal of the Korean Statistical Society
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    • v.5 no.2
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    • pp.109-118
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    • 1976
  • 현행 일반적으로 쓰여지고 있는 물가지수 산식은 기준시점의 거래량(또는 거래금액)을 상품별 가중치(weight)로 삼는 가중총합방식(weighted aggregate formula, 또는 가중산술평균산식)으로서의 Laspeyres식이라 함은 주지하는 바와 같다. 그것이 상품별로 유통면의 중요성을 분명히 감안하여 있고, 비교시점의 가격변동만이 계산에 반영된다는 점에 있어서 물가지수로서의 실용성이 널리 인정되어 있는 산식이다. 그러나 Lasperyres식의 난점을 또한 많은 것이니 그 가운데 특히 가중치의 고정성과 관련하여 기준시점의 이동에 따른 전후 물가지수의 비연결성은 결정적 결함이라 할 수 있다. 여기에 이 식의 지수적 허구성이 흔히 논의되고, 이른바 Paasche check라 하여 수시로 조사한 거래량(또는 거래금액)에 의하여 물가지수의 가중치로 삼아서 전자를 검정하는 방법도 쓰여지는 형편이다. 필지는 일찌기(1973년) Laspeyres식의 상품별 가중치에 관한 객관적 평가법의 하나로서 산업(따라서 상품)의 연관분석적 수단에 의한 약간의 시안을 발표한 바 없지 않았다. 그것은 요약컨대 산업연관분석에 쓰이는 투입계수표를 중심삼아 한 상품가격이 다른 상품가격에 미치는 파급효과, 따라서 물가에 미치는 파급력을 계산하고, 나아가서 각 상품의 수요 및 공급함수를 도입하여 그들 계수를 추정함으로써 가중치의 객관화를 꾀해 본 것이 전고의 골자이다.

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Effects of on-base and slugging ability on run productivity in Korean professional baseball (한국 프로야구에서 출루 능력과 장타력이 득점 생산성에 미치는 영향)

  • Kim, Hyuk Joo
    • Journal of the Korean Data and Information Science Society
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    • v.23 no.6
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    • pp.1065-1074
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    • 2012
  • The purpose of this paper is to statistically analyze the effects of on-base and slugging ability on the run productivity in Korean professional baseball. In Section 2, we have investigated the OPS (On-base percentage Plus Slugging average) and introduced new indices of batting ability by modifying the OPS. In Section 3, we have examined the correlation which the batting average, on-base percentage, slugging average, IsoP (Isolated Power), OPS and the indices introduced in Section 2 have with the average runs per game, using the data from all the games of the regular seasons in 2007~2011. In addition, by generalizing the OPS and the indices introduced in Section 2, we have analyzed the correlation of the indices with various weights between the average runs per game. As a result, the weighted OPS consisting of on-base percentage (with weight 57%) and slugging average (with weight 43%) has been found to give the best explanation of the run productivity.

Cross Correlations between Probability Weighted Moments at Each Sites Using Monte Carlo Simulation (Monte Carlo 모의를 이용한 지점 간 확률가중모멘트의 교차상관관계)

  • Shin, Hong-Joon;Jung, Young-Hun;Heo, Jun-Haeng
    • Journal of Korea Water Resources Association
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    • v.42 no.3
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    • pp.227-234
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    • 2009
  • In this study, cross correlations among sample data at each site are calculated to obtain the asymptotic cross correlations among probability weighted moments at each site using Monte Carlo simulation. As a result, the relations between the asymptotic cross correlations among probability weighted moments and the inter-site dependence among sample data at each site are nearly a linear relation with slope 1. The smaller ratio of concurrent data size to entire sample size is, the weaker the relationship grows. Simple power function which the correction term in power function accounts for the differences of the sample size between two sites was fitted to each case to estimate the parameter. It is noted that this result can be used in the various researches which include the estimation of the variance of quantile considering cross correlations.

A Study on the Weight Adjustment Method for Household Panel Survey (가구 패널조사에서의 가중치 조정에 관한 연구)

  • NamKung, Pyong;Byun, Jong-Seok;Lim, Chan-Soo
    • The Korean Journal of Applied Statistics
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    • v.22 no.6
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    • pp.1315-1329
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    • 2009
  • The panel survey is need to have a more concern about a response due to a secession and non-response of a sample. And generally a population is not fixed and continuously changed. Thus, the rotation sample design can be used by the method replacing the panel research. This paper is the study of comparison to equal weight method, Duncan weight, Design weight method, weight share method in rotation sample design. More specifically, this paper compared variance estimators about the existing each method for the efficiency comparison, and to compare the precision using the relative efficiency gain by the Coefficient Variance(CV) after getting the design weight from the actual data.

Proposal of New Correction Factors for New and Renewable Energy Sources in Public Building (공공건축물에 적용되는 신·재생에너지원의 새로운 보정계수 제안)

  • Kim, Yun-Ho;Park, Yun-Ha;Won, An-Na;Hwang, Jung-Ha
    • Journal of the Korean Solar Energy Society
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    • v.36 no.6
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    • pp.13-24
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    • 2016
  • The government introduced a mandatory installation system of new & renewable energy for public building to meet the target of greenhouse gas reduction and also suggest a correction factor for new renewable energy to expand the installation of various new & renewable energy systems. The introduction of correction factors, however, was followed by the reduction of installation size of new & renewable energy sources. Assuming that it was caused by a correction factor for each new renewable energy source calculated by the initial costs, this study proposed a new correction factor approach based on payback periods to reflect the technology element in the calculation process of correction factors additionally. The application results of new correction factors show that it was possible to do complex calculations including the economic and technological aspects to select a new & renewable energy system and that the installation size was also enlarged.

Approximate Variance of Least Square Estimators for Regression Coefficient under Inclusion Probability Proportional to Size Sampling (포함확률비례추출에서 회귀계수 최소제곱추정량의 근사분산)

  • Kim, Kyu-Seong
    • Communications for Statistical Applications and Methods
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    • v.19 no.1
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    • pp.23-32
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    • 2012
  • This paper deals with the bias and variance of regression coefficient estimators in a finite population. We derive approximate formulas for the bias, variance and mean square error of two estimators when we select a fixed-size inclusion probability proportional to the size sample and then estimate regression coefficients by the ordinary least square estimator as well as the weighted least square estimator based on the selected sample data. Necessary and sufficient conditions for the comparison of the two estimators in terms of variance and mean square error are suggested. In addition, a simple example is introduced to numerically compare the variance and mean square error of the two estimators.

Automatic Premature Ventricular Contraction Detection Using NEWFM (NEWFM을 이용한 자동 조기심실수축 탐지)

  • Lim Joon-Shik
    • Journal of the Korean Institute of Intelligent Systems
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    • v.16 no.3
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    • pp.378-382
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    • 2006
  • This paper presents an approach to detect premature ventricular contractions(PVC) using the neural network with weighted fuzzy membership functions(NEWFM). NEWFM classifies normal and PVC beats by the trained weighted fuzzy membership functions using wavelet transformed coefficients extracted from the MIT-BIH PVC database. The two most important coefficients are selected by the non-overlap area distribution measurement method to minimize the classification rules that show PVC classification rate of 99.90%. By Presenting locations of the extracted two coefficients based on the R wave location, it is shown that PVC can be detected using only information of the two portions.