• 제목/요약/키워드: Chung-Ju

검색결과 4,221건 처리시간 0.04초

회귀 분석에서 이상치가 미치는 영향 (The Effect of Outliers in Regression Analysis)

  • 김광수;배영주;이진규
    • 품질경영학회지
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    • 제24권2호
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    • pp.158-171
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    • 1996
  • Outlier is one that appears to deviate extremely from other data in collected data. Thus treatment of outlier is very important work, because it is to distort the meaning of whole data in its analysis and to reduce the accuracy and validity for adequate models. The aim of this paper is to present some ways of handling outliers in given data and to investigate the effect of the analysis result before and after outlier reject. As a variety of methods has been proposed, we sellect the linear regression analysis and two linear programming techniques and compare to each result.

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절삭유의 미립화 특성 (Atomization Characteristics of Cutting Fluids)

  • 황준;정의식;정진열;황덕철
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 2002년도 춘계학술대회 논문집
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    • pp.943-946
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    • 2002
  • This paper presents atomization characteristics of cutting fluids. To analyze the behavior characteristics of cutting fluid, analytical approach and experimental measurement were performed to predict the aerosol size, velocity and concentration due to cutting fluid atomization mechanism in machining operation. The established analytical model which is based on atomization theory analyzes the cutting fluid motion and aerosol generation in machining process. The predictive models can be used as a basis for environmental impact analysis on the shop floor. It can be also facilitate the optimization of cutting fluid usage in achieving a balanced consideration of productivity and environmental consciousness.

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대학생들의 자기해석과 로하스 간의 관계에 관한 연구 (Study on Effects of Undergraduates' Self-construal on LoHAS)

  • 이일한;한주희;황금주
    • 한국환경교육학회지:환경교육
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    • 제24권1호
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    • pp.49-65
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    • 2011
  • This paper explored undergraduates' LoHAS purchasing behavior and factors influencing the behavior, including' self-construal, and LoHAS values, attitudes and behavior. First, this study investigated how self-construal affected LoHAS values, and then analyzed how LoHAS values influenced LoHAS attitude and behavior. We administerd a survey with undergraduates attending a university located in the metropolitan area. The analysis results indicate that ecological self-construal affects LoHAS values. According to the analysis, both environmentalism and sustain ability of LoHAS values also affect LoHAS attitude, and then the attitude influences LoHAS behavior. This study shows the casual relationship between variables including self-construal, LoHAS values, attitude and behavior. In particular, this finding confirms that self-construal as one of psychological factors affects LoHAS consumers' values and behavior.

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K-means 클러스터링을 이용한 초고압 케이블 절연재료의 부분방전 분포 해석 (Partial Discharge Distribution Analysis of Ultra High Voltage Cable using K-means clustering)

  • 이강원;이혁진;이충호;연규호;홍진웅
    • 한국전기전자재료학회:학술대회논문집
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    • 한국전기전자재료학회 2007년도 추계학술대회 논문집
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    • pp.201-202
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    • 2007
  • In this paper we investigated the partial discharge distribution using the K-means clustering according to the needle of tilt and void at the cross linked polyethylene(XLPE) insulators. As a result, the specimen with tilt $45^{\circ}$ has highest breakdown voltage and the specimen with air void has lower breakdown voltage than the specimen with on void. In K-menas clustering distribution of clusters concentrates at inception condition, but the distribution spreads widely at breakdown.

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Anti-oxidant activity of avicularin and isovitexin from Lespedeza cuneata

  • Lee, Ju Sung;Lee, Ah Young;Quilantang, Norman G.;Geraldino, Paul John L.;Cho, Eun Ju;Lee, Sanghyun
    • Journal of Applied Biological Chemistry
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    • 제62권2호
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    • pp.143-147
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    • 2019
  • This study evaluated the anti-oxidant activity of avicularin and isovitexin from Lespedeza cuneata using 2,2-diphenyl-1-picrylhydrazyl (DPPH) and hydroxyl (OH) scavenging assays. The results showed that among the four fractions, the highest OH radical scavenging activity was exhibited by the n-butanol fraction. The DPPH radical scavenging activities of avicularin and isovitexin were higher than 50% at a concentration of $100{\mu}g/mL$. Moreover, one hundred micrograms per liter of avicularin and isovitexin exhibited effective anti-oxidant activity, with the OH radical scavenging rates being 87.54 and 91.48%, respectively. These results suggest that Lespedeza cuneata would be useful anti-oxidant agents from natural sources.

노인 환자에서 발생한 거짓막 괴사성 기관지 아스페르길루스증 1예 (A Case of Pseudomembranous Necrotizing Bronchial Aspergillosis in An Old Age Host)

  • 이승은;전은주;송주한;신종욱;김재열;박인원;최병휘;최재철;김미경
    • Tuberculosis and Respiratory Diseases
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    • 제63권3호
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    • pp.278-282
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    • 2007
  • 거짓막 괴사성 기관지 아스페르길루스증은 심한 면역 저하가 있는 환자에서 발생하는 드문 질환으로 높은 사망률을 보이고 있다. 저자들은 당뇨병 외에는 과거력이 없는 고령의 환자에서 거짓막 괴사성 기관지 아스페르길루스증을 1예 진단하였으며 적절한 치료로 호전되어 문헌고찰과 함께 보고하는 바이다.

Transcriptome Analysis in the Midgut of the Earthworm (Eisenia andrei) using Expressed Sequence Tags

  • Lee, Myung-Sik;Cho, Sung-Jin;Lee, Jong-Ae;Moon, Joo-Sik;Cho, Hyun-Ju;Park, Bum-Joon;Kim, Seong-Ki;Choo, Jong-Kil;Park, Soon-Cheol
    • 한국잠사학회:학술대회논문집
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    • 한국잠사학회 2003년도 International Symposium of Silkworm/Insect Biotechnology and Annual Meeting of Korea Society of Sericultural Science
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    • pp.144-144
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    • 2003
  • In order to understand the expression profile of earthworm midgut, we analyzed 1255 expressed sequence tags (ESTs) derived from earthworm midgut cDNA library. Among 1255 ESTs analyzed, 537 (42.8%) ESTs represented 231 unique genes of which 168 ESTs were singletons and 63 ESTs represented by two or more ESTs. A total of 571 unknown ESTs showed no significant homology. The remaining 147 (11.7%) ESTs whose lengths were less than 150 bp were removed. Among 231 identified unique genes, 168 genes (72.7%) were sequenced only once. (omitted)

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