• 제목/요약/키워드: Principal factor analysis

검색결과 609건 처리시간 0.031초

Distortion and Dilatatioin in the Tensie Failure of Paper

  • Park, Jong-Moon;James L. Thorpe
    • 펄프종이기술
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    • 제31권5호
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    • pp.73-85
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    • 1999
  • Yield and fracture are separated in the tensile failure of paper. Failure in the machine direction of photocopy paper is contrasted with failure in the cross-machine direction . The ratios of distortion (shape change) to dilatation (volume change) for individual elements at yield and fracture are described. The ratios of distortion to dilatation are measured and compared to predicted values of the strain energy density theory. To evaluate the effect of the angle from the principal material direction on the strain energy density theory. To evaluate the effect of the angle from the principal material direction on the strain energy density factor, samples are prepared from machine direction to cross-machine direction in 15 degree intervals. the strain energy density of individual elements are obtained by the integration of stress from finite element analysis with elastic plus plastic strain energy density theory. Poison's ratio and the angle from the principal material direction have a great effect ion the ratio fo distortion to dilatation in paper. During the yield condition, distortion prevails over dilatation . At fracture, dilatation is at a maximum.

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무역원활화가 중국 수출입에 미치는 영향 분석 - APEC 국가 중심으로 - (Analysis of the Impact of Trade Facilitation on China's Trade - Focused on APEC countries -)

  • 주선;최창환
    • 무역학회지
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    • 제47권4호
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    • pp.1-14
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    • 2022
  • This study examines the impact of trade facilitation on China's trade for the period 2010-2017 using a gravity model with a measurement of APEC trade facilitation through principal component analysis. The empirical results confirmed that trade facilitation was a key factor to have a positive effect on Chinese exports and that the higher the level of trade facilitation in APEC countries, the more positive the increase in exports and quantities with China. Further, the size of the economy, the total population, and the border between the trading partner had a positive effect on Chinese trade volume. To promote economic growth through increase in trade volume, countries should actively improve trade facilitation and participate in global trade facilitation reform through continuous cooperation with trading partners.

한글판 펜실베니아 걱정 질문지의 탐색적 및 확인적 요인 분석 (Exploratory and Confirmatory Factor Analysis of the Korean version of the Penn State Worry Questionnaire)

  • 전준원;김대호;김은경;노성원
    • 대한불안의학회지
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    • 제13권2호
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    • pp.86-92
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    • 2017
  • Objective : This study evaluated the factor structure of a Korean version of the Penn State Worry Questionnaire (K-PSWQ) with exploratory factor analysis in healthy adult subjects, and confirmatory factor analysis of subjects who have received psychiatric treatment. Methods : Exploratory principal component analysis was conducted with data from 318 non-psychiatric subjects, and 118 psychiatric patients were subjected to confirmatory factor analysis (maximum likelihood estimation). Participants were voluntary visitors at the booth who agreed to undergo screening for anxiety disorder at 2013 & 2014 Korea Mental Health Exhibitions. Results : Exploratory analysis revealed a two factor structure of the scale with total variance of 56.3%. Factor 1 was considered 'Worry engagement', and factor 2 was considered 'Absence of worry'. However, the results of the confirmatory factor analysis supported that both one factor model with method factor and two factor model are fit to structure of the scale considering fit indices. Internal consistency of total questions was good (Cronbach's ${\alpha}=0.899$). Conclusion : Our results supported the previously suggested factor structure of the PSWQ, and proved factorial validity of the K-PSWQ in both populations.

주성분 회귀분석 및 인공신경망을 이용한 AE변수와 응력확대계수와의 상관관계 해석 (Analysis on Correlation between AE Parameters and Stress Intensity Factor using Principal Component Regression and Artificial Neural Network)

  • 김기복;윤동진;정중채;박휘립;이승석
    • 비파괴검사학회지
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    • 제21권1호
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    • pp.80-90
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    • 2001
  • AE 신호와 재료의 기계적 물성과의 관계를 정량적으로 제시할 수 있는 방법을 개발하였다. 재료의 여러 가지 기계적 성질들 중 피로균열 거동에 관련된 응력확대계수를 중심으로 AE 신호와 같은 다변량 데이터의 처리에 많이 사용되고 있는 주성분 회귀분석과 비선형적 문제 해결에 적합한 신경회로망 기법을 이용하였다. 이를 위하여 강교량 부재인 SWS490B 강에 대한 피로균열전파 실험을 수행하였으며 표준 CT 시편에 대한 피로균열진전 시 발생하는 AE 신호의 각 변수와 응력확대계수와의 관계를 고찰하였다. 통계분석 방법인 변수선택법을 적용한 결과 AE 카운트(RC), 에너지(EN), 신호지속시간(ED)의 각각에 대한 유의성이 높은 것으로 나타났으나 전반적으로 전체 AE 변수를 모두 이용할 경우 통계적 유의성이 높은 것으로 나타났다. 부재의 반복하중 시 발생하는 피로균열진전을 정량적으로 도출할 수 있는 응력확대계수 추정모델을 개발하고 평가하였다. 미지 시료에 대하여 개발된 모델의 응력확대계수 예측 성능을 분석한 결과 주성분 회귀모델과 인공신경망 모델 모두 우수한 예측성능을 나타내었으나 전반적으로 인공신경망 모델이 주성분 회귀모델보다 다소 양호한 것으로 분석되었다.

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Phenotypic Factor Analysis for Linear Type Traits in Beijing Holstein Cows

  • Chu, M.X.;Shi, S.K.
    • Asian-Australasian Journal of Animal Sciences
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    • 제15권11호
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    • pp.1527-1530
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    • 2002
  • Factor analysis was applied to the phenotypic correlation matrix of 15 linear type traits (scored linearly 1 to 50 points) for 2035 Holstein cows of 38 sires computed from data collected between 1988 and 1992 in Beijing Shuangqiao Farm and Beijing Xijiao Farm. The 15 linear type traits were stature, body strength, body depth, dairy form, rump angle, rump length, rump width, rear leg side view, foot angle, fore udder attachment, rear udder height, rear udder width, udder cleft, udder depth and teat placement rear view. The first four components accounted for 49.1% of the total variance in type scores. Factor 1 reflected strong cows, with deep bodies, with long and wide rumps, and tall in stature. Factor 2 reflected cows with well attached fore udders, wide rear udders and whose udders were supported by strong suspensory ligaments with close teat placement. Factor 3 reflected cows with good dairyness, sickled in the hocks, high rear udders and udder floors above the hocks. Factor 4 reflected cows with sloping rumps from hooks to pins and with steep foot angle. Principal component and factor analyses are useful to clarify the relationships among type traits.

Reliability and Validity of the Malay Version of the Breast-Impact of Treatment Scale (MVBITS) in Breast Cancer Women undergoing Chemotherapy

  • Zainal, Nor Zuraida;Shuib, Norley;Bustam, Anita Zarina;Sabki, Zuraida Ahmad;Guan, Ng Chong
    • Asian Pacific Journal of Cancer Prevention
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    • 제14권1호
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    • pp.463-468
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    • 2013
  • Background: Body image dissatisfaction among breast cancer survivors has been associated with psychological stress resultant from breast cancer and resultant surgery. This study aimed to examine the psychometric properties of the Malay Version of the Breast-Impact of Treatment Scale (MVBITS) and to investigate the associations of retained factors with the Hospital Anxiety and Depression Scale (HADS) and the Rosenberg Self-Esteem Scale (RSES). Materials and Methods: The MVBITS was 'forward-backward' translated from English to Malay and then administered to 70 female breast cancer patients who came to the Oncology Clinic of University Malaya Medical Centre, Kuala Lumpur, Malaysia to undergo chemotherapy. Principal component analysis (PCA) with varimax rotation was performed to explore the factor structure of the MVBITS. Associations of retained factors were estimated with reference to Spearman correlation coefficients. Results: The internal consistency reliability of MVBITS was good (Cronbach's alpha 0.945) and showed temporal stability over a 3-week period. Principal component analysis suggested two factors termed as 'Intrusion' and 'Avoidance' domains. These factors explained 70.3% of the variance. Factor 1 comprised the effects of breast cancer treatment on the emotion and thought, while Factor 2 informed attempts to limit exposure of the body to self or others. The Factor 1 of MVBITS was positively correlated with total, depression and anxiety sub-scores of HADS. Factor 2 was positively correlated with total and anxiety sub-scores of HADS. MVBITS was also positively correlated with the RSES scores. Conclusions: The results showed that the Malay Version of Breast-Impact of Treatment Scale possesses satisfactory psychometric properties suggesting that this instrument is appropriate for assessment of body change stress among female breast cancer patients in Malaysia.

3차원 파괴조건식을 이용한 콘크리트 플러그의 안전도 평가 (Stability Analysis of Concrete Plugs Using a 3-D Failure Criterion)

  • 이연규;송원경;박철환;최병희
    • 터널과지하공간
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    • 제21권6호
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    • pp.526-535
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    • 2011
  • 중간주응력을 고려할 수 있는 새로운 콘크리트 파괴조건식을 제안하였다. 제안된 파괴조건식은 Mohr-Coulomb 파괴조건식과 Willam-Warnke의 파괴조건식의 장점을 수용하고 있으므로 자오면에서는 선형파괴식으로 나타나고 팔면체응력면에서는 항상 볼록인 궤적을 보이며 특이성을 갖지 않는다. 진삼축압축시험 결과를 이용한 회귀분석을 통하여 제안된 파괴조건식의 적합성을 검증하였다. 제안된 파괴조건식에 기초한 안전율 공식을 정의하고 이를 파일롯 플랜트에 설치된 콘크리트 플러그의 안전도 해석에 이용하였다. 제안된 안전율 공식은 팔면체응력면에서 응력상태 점의 파괴곡면에 대한 접근도를 의미한다. 마지막으로 플러그의 응력분포를 계산하기 위해 파일롯 플랜트에 대한 3차원 응력해석을 실시하였다. 플러그의 응력분포는 제안된 안전율 공식을 이용하여 안전율 분포로 변환시켰다. 콘크리트 플러그의 안전율 분포특성 분석을 통해 테이퍼형 및 쐐기형 플러그의 안전도를 평가하였다.

Understanding Volunteers' Motivations and Their Satisfactions: A Case Study of Forest Interpreters in Chungbuk Province

  • Shin, Won Sop
    • 한국산림과학회지
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    • 제95권2호
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    • pp.188-193
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    • 2006
  • Volunteerism is an emerging issue in public resource management such as forest recreation management. As volunteers, forest interpreters play a significant role in supporting and educating visitors to forest recreation areas. The purpose of this study was to examine forest interpreters' motivation and their job satisfaction. To collect data, a set of self-administered questionnaire was sent to 250 members of Chungbuk Forest Interpreters' Association during August and September of 2005. 152 completed questionnaires were returned. Principal component factor analyses yield five motivation factors and four satisfaction factors. All the factors were highly correlated.

Factor Analysis of Biometric Traits of Kankrej Cows to Explain Body Conformation

  • Pundir, R.K.;Singh, P.K.;Singh, K.P.;Dangi, P.S.
    • Asian-Australasian Journal of Animal Sciences
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    • 제24권4호
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    • pp.449-456
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    • 2011
  • Eighteen different biometric traits in 407 Kankrej cows from their breeding zone, i.e. Palanpur district of Gujarat, India, were recorded and analyzed by factor analysis to explain body conformation. The averages of body length, height at withers, height at shoulder, height at knee, heart girth, paunch girth, face length, face width, horn length, horn diameter, distance between horns, ear length, ear width, neck length, neck diameter, tail length with switch, tail length without switch and distance between hip bones were $123.44{\pm}0.37$, $124.49{\pm}0.28$, $94.68{\pm}0.30$, $38.2{\pm}0.14$, $162.56{\pm}0.56$, $178.95{\pm}0.70$, $44.09{\pm}0.10$, $15.91{\pm}0.05$, $42.47{\pm}0.53$, $26.07{\pm}0.19$, $13.34{\pm}0.08$, $31.24{\pm}0.12$, $16.10{\pm}0.05$, $50.63{\pm}0.18$, $73.21{\pm}0.32$, $111.62{\pm}0.53$, $89.34{\pm}0.34$ and $17.28{\pm}0.10\;cm$, respectively. The correlation coefficients between different traits ranged from -0.806 (horn diameter and distance between horns) to 0.815 (heart girth and paunch girth). Most of the correlations were positive and significant. Factor analysis with promax rotation with power 3 revealed three factors which explained about 66.02% of the total variation. Factor 1 described the cow body and explained 38.89% of total variation. The second factor described the front view/face of the cow and explained 19.68% of total variation. The third factor described the back of the cow and explained 7.44% of total variation. It was necessary to include some more variables for factor 3 to obtain a reliable estimate of the back view of the cow. The lower communities shown for distance between horns, horn diameter, ear width and neck diameter indicated that these traits did not contribute effectively to explaining body conformation and can be dropped from recording, whereas all other traits are important and needed to explain body conformation in Kankrej cows. The result suggests that principal component analysis (PCA) could be used in breeding programs with a drastic reduction in the number of biometric traits to be recorded to explain body conformation.

성인남자 목부위의 연령별 형태변화에 관한 연구(제3보) -직접계측치와 주성분 분석에 의한 해석- (Observation on Neck Form Changes Related to Aging in Men (Part III) -by the Somatometric Data and the Principal Component Ana]isis-)

  • 이영숙
    • 한국의류학회지
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    • 제19권3호
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    • pp.463-470
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    • 1995
  • Anthropological measurements concerning 29 items were made on 37 adult males aged from 20 to 60. Factor analysis was applied in all 36 items. The main results are as gallows 1. Neck girth and need base girth are smaller. in the elder croup than the gouger group. 2. These decrease occur in the frontal part of the neck. 3. Neck frontal width decreases with age, but side depth increases. 4. The back part of the body depth at the level of the shoulder increases with age. 5. For the factor analysis, the third factor is a factor of forms, the variations of which has a relation with age.

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