• Title/Summary/Keyword: SCOTT

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Analysis on the Variability of Rainfall at the Seoul Station during Summer Season Using the Variability of Parameters of a Stochastic Rainfall Generation Model (추계학적 강우모형의 매개변수 변동을 통한 서울지역 여름철 강우 변동특성 분석)

  • Cho, Hyungon;Kim, Gwangseob;Yi, Jaeeung
    • Journal of Korea Water Resources Association
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    • v.47 no.8
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    • pp.693-701
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    • 2014

  • In this study a stochastic rainfall generation model is used to analyze the structural variability of rainfall events since it has limitations in the traditional approach of measuring rainfall variability according to different durations. The NSRPM(Neyman-Scott Rectangular Pulse Model) is a stochastic rainfall generation model using a point process with 5 model parameters which is widely used in hydrologic fields. The five model parameters have physical meaning associated with rainfall events. The model parameters were estimated using hourly rainfall data from 1973 to 2011 at Seoul stations. The variability of model parameter estimates was analyzed and compared with results of traditional analysis.

  • https://doi.org/10.3741/JKWRA.2014.47.8.693 인용 PDF KSCI

Comparative Analysis of Unweighted Sample Design and Complex Sample Design Related to the Exploration of Potential Risk Factors of Dysphonia (잠재적 위험요인의 탐색에 관한 단일표본분석과 복합표본분석의 비교)

  • Byeon, Hae-Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.5
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    • pp.2251-2258
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    • 2012

  • This study compared the unweighted sample design, frequency weighted sample design and complex sample design to using 2009 Korea National Health and Nutrition Examination Survey in an effort to identify whether or not there is any difference in potential risk factors. Pearson chi-square test and Rao-scott chi-square test were applied to the analytic methods. As a result of analyses, all the variables were overestimated as significant risk factors in case of the unweighted sample design to which only the frequency weights were applied. In addition, there were differences in the confidence levels and results from the simple random sampling analysis and complex sample design to which no weight was applied. It is necessary to carry out the complex sample design rather than the analysis to which the frequency weights are applied, in order to ensure the findings to represent the whole population when our national statistics data is used.

  • https://doi.org/10.5762/KAIS.2012.13.5.2251 인용 PDF KSCI

A Study of New Modified Neyman-Scott Rectangular Pulse Model Development Using Direct Parameter Estimation (직접적인 매개변수 추정방법을 이용한 새로운 수정된 Neyman-Scott 구형펄스모형 개발 연구)

  • Shin, Ju-Young;Joo, Kyoung-Won;Heo, Jun-Haeng
    • Journal of Korea Water Resources Association
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    • v.44 no.2
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    • pp.135-144
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    • 2011

  • Direct parameter estimation method is verified with various models based on Neyman-Scott rectangular pulse model (NSRPM). Also, newly modified NSRPM (NMSRPM) that uses normal distribution is developed. Precipitation data observed by Korea Meteorological Administration (KMA) for 47 years is applied for parameter estimation. For model performance verification, we used statistics, wet ratio and precipitation accumulate distribution of precipitation generated. The comparison of statistics indicates that absolute relative error (ARE)s of the results from NSRPM and modified NSRPM (MNSRPM) are increasing on July, August, and September and ARE of NMNSRPM shows 10.11% that is the smallest ARE among the three models. NMNSRPM simulates the characteristics of precipitation statistics well. By comparing the wet ratio, MNSRPM shows the smallest ARE that is 16.35% and by using the graphical analysis, we found that these three models underestimate the wet ratio. The three models show about 2% of ARE of precipitation accumulate probability. Those results show that the three models simulate precipitation accumulate probability well. As the results, it is found that the parameters of NSRPM, MNSRPM and NMNSRPM are able to be estimated by the direct parameter estimation method. From the results listed above, we concluded that the direct parameter estimation is able to be applied to various models based on NSRPM. NMNSRPM shows good performance compared with developed model-NSRPM and MNSRPM and the models based on NSRPM can be developed by the direct parameter estimation method.

  • https://doi.org/10.3741/JKWRA.2011.44.2.135 인용 PDF KSCI

Dual Select Diode AMLCDs;A Path Towards Scalable Two Mask Array Designs

  • Boer, Willem Den;Smith, G. Scott
    • 한국정보디스플레이학회:학술대회논문집
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    • 2004.08a
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    • pp.383-388
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    • 2004

  • In this paper an alternative Active Matrix LCD technology is described with scalable, low cost processing. The Dual Select Diode AMLCD requires 60% lower capital investment in the array process than a-Si TFT arrays and results in 20% lower cost LCD modules. Development at several AMLCD manufacturers is in progress.

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