• 제목/요약/키워드: Selection effects

검색결과 1,946건 처리시간 0.029초

유성생식 유전알고리즘 : 다중선택과 이배성이 탐색성능에 미치는 영향 (Sexual Reproduction Genetic Algorithms: The Effects of Multi-Selection & Diploidy on Search Performances)

  • 류근배;최영준;김창업;이학성;정창기
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 1995년도 하계학술대회 논문집 B
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    • pp.1006-1010
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    • 1995
  • This paper describes Sexual Reproduction Genetic Algorithm(SRGA) for function optimization. In SRGA, each individual utilize a diploid chromosome structure. Sex cells(gametes) are produced through artificial meiosis in which crossover and mutation occur. The proposed method has two selection operators, one, individual selection which selects the individual to fertilize, and the other, gamete selection which makes zygote for offspring production. We consider the effects of multi-selection and diploidy on search performance. SRGA improves local and global search(exploitation and exploration) and show optimum tracking performance in nonstationary environments. Gray coding is incorporated to transforming the search space and Genic uniform distribution method is proposed to alleviate the problem of premature convergence.

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자영업 선택의 결정 요인에 관한 연구 (A Study of Selection of Self-employment in Korea)

  • 전병유
    • 노동경제논집
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    • 제26권3호
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    • pp.149-179
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    • 2003
  • 본 연구는 외환위기 이후 우리나라에서 자영업 선택에 영향을 미치는 요인들을 미시적이고 거시적인 차원에서 종합적으로 검토하였다. 특히, 금전적인 제약과 실업률로 대표되는 경기적 요인이 자영업 선택에 미치는 요인에 대해서 검토하였다. 한국노동연구원의 "한국노동패널" 1~4차년도 자료와 통계청의 "경제활동인구조사"를 사용하여 분석한 결과, 학력이나 직업 경험과 같은 인적자본은 남성의 자영업 선택에 정(+)의 효과를 가지는 것으로 나타났고, 여성의 경우에는 직업 경험이 자영업 선택에 부(-)의 효과를 가지는 것으로 나타났다. 부동산 자산 소유는 고용주 선택에서만 유의한 것으로 나타난 반면, 금융 자산 소유에 따른 소득은 자영업 선택에 오히려 부(-)의 효과를 가지는 것으로 나타났다. 기업가적인 문화와 환경 조건을 반영하는 자영업 경험 여부 또는 부모가 자영업인가의 여부는 남녀 모두 유의하게 자영업의 선택 확률을 높이는 방향으로 작용하는 것으로 나타났다. 한편, 본 연구에서 가장 관심있게 검토한 실업률과 자영업 선택 간의 관계는, 우선 미시적인 분석에서 선택편의와 예상소득기회의 차이를 통제한 구조 모형에서 실업률은 유의하게 정(+)의 효과를 가지는 것으로 나타났다. 또한, 거시 분석에서도, 경기변동과 노동시장의 조건을 반영하는 실업률과 자영업 선택 간의 관계는 외환위기 이후 대체로 정(+)의 관계를 나타내는 것으로 나타나고 있어, 자영업은 실업에 대한 하나의 대안이라는 '밀어내기 가설'을 지지하는 것으로 나타났다. 이는 경기변동에 대응하는 자영업 선택에 관한 개인의 의사결정에서 자영업 선택에 따른 소득기회와 관련된 여러 가지 불확실성과 개인적 특성의 차이 등이 중요하게 작용하고 있음을 시사한다.

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Mixed Effects Kernel Binomial Regression

  • Hwang, Chang-Ha
    • Journal of the Korean Data and Information Science Society
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    • 제19권4호
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    • pp.1327-1334
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    • 2008
  • Mixed effect binomial regression models are widely used for analysis of correlated count data in which the response is the result of a series of one of two possible disjoint outcomes. In this paper, we consider kernel extensions with nonparametric fixed effects and parametric random effects. The estimation is through the penalized likelihood method based on kernel trick, and our focus is on the efficient computation and the effective hyperparameter selection. For the selection of hyperparameters, cross-validation techniques are employed. Examples illustrating usage and features of the proposed method are provided.

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시판 라면류의 선택 속성이 만족도에 미치는 영향에 관한 연구 - 어린이 및 청소년을 중심으로 - (Effects of Instant Noodle (Ramyun)'s Selection Attribution upon Satisfaction - Focus on Children and Adolescents -)

  • 정효선;윤혜현
    • 한국식생활문화학회지
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    • 제27권1호
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    • pp.49-56
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    • 2012
  • The purpose of this study was to understand the influence of instant noodle's selection attribution on satisfaction and to empirically analyze whether or not grade (elementary schoolchildren, middle school students, high school students) plays a moderating role in the relationship between selection attribution and satisfaction. Further, this study examined the differences in demographic characteristics among two groups of subjects divided by instant noodle's selection attribution. Based on a total of 1021 samples, this study verified a total of 3 hypotheses using the SPSS program. Data were analyzed by frequency analysis, chi-square, t-test, factor analysis, reliability analysis, cluster analysis, discriminant analysis, and hierarchical regression analysis. Results of the study were as follows. There were three different instant noodle's selection attributions among the children and adolescents investigated: internal element, external element, and company reliability. The multiple regression results show that internal element (=.391), external element (=.239), and company reliability (=.063) among customers' selection attributions had significant positive effects on satisfaction. In addition, the effect of selection attribution upon satisfaction was partially moderated according to grade. Further, cluster analysis divided subjects into two groups according to instant noodle's selection attribution: high-selection group vs. low-selection group. The wo groups of subjects classified by instant noodle's selection attribution were also different from each other in demographic characteristics. Limitations and future research directions are also discussed.

Selection of electrooptic effects for diffractive LCD.

  • Tsvetkov, V.A.;Shoshin, V.M.;Bobylev, Ju.P.
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2003년도 International Meeting on Information Display
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    • pp.374-377
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    • 2003
  • We reported researches of possibility of the usage of known electrooptical effects (EOE) for diffractive displays (DLCD). We found different EOEs provide the possibility of broad selection of steepness of volt-contrast characteristics at rather large steep of modulation without the usage polarizes. The data are represented much promising for broad development DLCDs.

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전업주부 스트레스에 따른 가공편의식품 구매태도 및 선택속성의 구조적 관계 - 서울, 경기지역 주부를 대상으로 - (Structural Relations of Convenience-Processed Food Purchasing Attitude and Selection Attribute according to Housewives' Stress - Focus on Housewives in Seoul and Gyeonggi Areas -)

  • 김난희;박영일;주나미
    • 대한영양사협회학술지
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    • 제25권4호
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    • pp.257-268
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    • 2019
  • This study provides basic data on how stress impacts the processed convenience foods purchase attitudes and the selection attributes of housewives. The stress consists of 3 factors, which were housework stress, family relation stress and economic stress. The processed convenience food purchase attitude consisted of 2 factors, which were peripheral influence purchase and conviction purchase. The processed convenience food selection attribute consisted of 4 factors, which were quality, convenience, packaging and price. Factor loading confirmation and reliability test were conducted, and the reliability was confirmed with Cronbach's alpha coefficients for all the factors exceeding 0.5. The high stress levels showed significantly high stress factors of housework, family relations and economic stress (P<0.001). The high stress group was shown to make purchases by recognizing peripheral influences (P<0.01). When the selection properties of processed convenience foods depending on different stress levels were examined, it was revealed that among the three groups, the low stress group least considered the price aspect (P<0.01). After deducting the factors, AMOS (Analysis of Moment Structure) was used to conduct the confirmatory factor analysis for verifying validity. The structural equation model was used to determine the path coefficient. From the processed convenience foods purchase attitude, the peripheral influence purchase had significantly positive (+) effects on convenience (P<0.05). Also, conviction purchase was shown to have significantly positive (+) effects on quality (P<0.05). Housework and family relation stress were shown to have negative (-) effects on processed convenience foods selection attribute, and economic stress was shown to have positive (+) effects, although no significant relationships were revealed.

전력설비종합자동화를 위한 감시제어포인트 선정에 관한 연구 (STUDY ABOUT THE SELECTION OF COMTROL AND INDICATION POINT FOR TOTAL AUTOMATION)

  • 이용해;남태현
    • 제어로봇시스템학회:학술대회논문집
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    • 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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    • pp.562-566
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    • 1989
  • The selection of control and indication joints effects the supervisory and control scope of SCADA system. This paper proposes the point selection for the no-man substation. The points of no-man s/s are 3-4times as many ad points of man-substation. And also the considering points are described to implement total automation.

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Estimation of Genetic Correlations and Selection Responses for Carcass Traits between Ultrasound and Real Carcass Measurements in Hanwoo Cows

  • Son, Jihyun;Lee, Deukhwan
    • Journal of Animal Science and Technology
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    • 제55권6호
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    • pp.501-508
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    • 2013
  • This study was conducted to determine genetic correlations among carcass traits measured by ultrasound and real carcass measurements and to estimate indirect selection responses for real carcass traits based on ultrasound measurements in Hanwoo cows. To accomplish this, 22,080 ultrasound measurement records from 17,926 cows collected from 2001 to 2012 and 11,907 carcass records obtained from fattened cattle from 2008 to 2012 were used. Genetic parameters were estimated based on eye muscle area (EMA), backfat thickness (BF) and marbling score (MS) measured by ultrasound-scanning of live cows and using the official technique on chilled bovine half-carcasses after slaughtering. Heritability and genetic correlation for carcass traits were estimated using a mixed model equation that consisted of environmental effects as fixed parameters and additive genetic effects and residual effects as random parameters, assuming that traits were different between ultrasound and carcass measurements. This statistical method was applied to the average information restricted maximum likelihood method. The heritability of EMA, BF and MS measured by ultrasound were 0.33, 0.61 and 0.46, respectively, while the heritability estimates of the corresponding traits based on carcass measurements were 0.29, 0.40 and 0.38, respectively and the genetic correlation between ultrasound and carcass traits for EMA, BF and MS were 0.41, 0.78 and 0.67, respectively. The genetic correlation between ultrasound and carcass traits was highly positive. Additionally, the selection response for marbling score was estimated to be 0.42 per generation if the cows were selected based on the ultrasound scan marbling score with an assumed selection intensity of 0.8. Overall, these results indicate that the ultrasound scan technique would be applicable to judging cow selection for genetically improved meat quality.

PDA 화면 내 버튼 선택을 위한 입력지원방식의 사용성 평가 (Usability Evalulation of Button Selection Aids for PDAs)

  • 박용성;한성호;문정태;전석희
    • 대한인간공학회지
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    • 제24권3호
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    • pp.1-10
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    • 2005
  • The primary objective of this study is to design input methods for assisting button selection tasks on a PDA screen. Familiar methods in the existing computing environments were investigated to develop aiding methods. Factors manipulated in the experiment included aiding method, button size, and users' prior experience with PDAs. A total of sixteen participants examined the usability of button selection tasks. Two types of button selection tasks were used as experimental tasks; one was selecting a target button, and the other was selecting multiple target buttons consecutively. The results showed that the aiding method and the button size had significant effects on the subjective satisfaction as well as the performance. In addition, users' prior experience with PDAs affected the performance significantly. The interaction between the aiding method and the button size was found to have significant effects on the performance. However, the interaction effect between the button size and the PDA experience was significant on the task performance time only for the multiple button selection tasks. Design considerations were proposed based on the experimental results. These can be applied to the PDA interaction design to make the PDAs more usable.

남자대학생의 라이프 스타일 요인이 의복의 구매동기, 정보원활용, 의복선택기준에 미치는 영향 연구 (The Impact of Lifestyle Factors on Clothing Purchase Motives, Information Use, and Selection Criteria in Male College Students)

  • 황진숙;이기춘
    • 복식
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    • 제50권4호
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    • pp.63-72
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    • 2000
  • The purpose of this study was to investigate the effects of lifestyle factors on clothing purchase motives, information use, and selection criteria in male college students. The sample included 241 male college students, and an instrument was developed based on the previous studies. The statistical analyses used for this study were factor analysis and multiple regression. The result of factor analysis showed that lifestyle consisted of six factors : clothing interest, serif-confidence, social participation, planned clothing purchase, family-orientation, and conservativeness. Clothing purchase motives consisted of conspicuous consumption motives, fashion and individuality motives, and economic motives. Clothing information use consisted of four factors: paper/display, personal advice, fashion show/clothing observation, and electronic media. Finally. clothing selection criteria consisted of practicability, fashion/individuality, and conformity, Multip1e regression revealed that there were significant effects of lifestyle factors on clothing purchase motives, information use, and selection criteria. For example, self-confidence factor had a negative impact on conspicuous consumption motive, personal advice information use, and fashion/individuality criteria. The relative importance of lifestyle factors were different according to different dimensions of clothing purchase motives, information use, and selection criteria.

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