• Title/Summary/Keyword: Comparison Research

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A Study on the Improvement of Water-Leakage Detection Reliability in Local Heating System (지역난방배관의 누수감지 신뢰성 향상에 관한 연구)

  • 신춘식;안영주;변기식
    • Journal of the Korean Society of Safety
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    • v.14 no.1
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    • pp.66-72
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    • 1999
  • Local heating transportation pipe has sensor and return lines to detect water-leakage. There are impulse and resistance comparison measurement types for a water-leakage detection. The impulse type shows large detection error within a measurement range. Since the resistance comparison type can find a comparative accurate single water-leakage point in the measurement range of heating pipe, it has been used to detect water-leakages these days. However if the multi water-leakages are happened in the measurement range of transportation pipe. the resistance comparison type shows a detection error point by the parallel resistance between a detection sensor line and ground. But the detection error will be minimized by the divided transportation pipe loops. In this research, it suggests the design of remote controlled detection system which can divide a large pipe loop and a possible single water-leakage measurement process in each divided loops.

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Bayesian Multiple Comparison of Normal Populations based on Bayes Factor

  • Kang, Sang-Gil;Lee, Chang-Soon
    • Journal of Korea Society of Industrial Information Systems
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    • v.7 no.1
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    • pp.42-49
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    • 2002
  • In this paper, we develop the Bayesian multiple comparison procedure for the normal model. The procedure which we suggest is based on the fractional Bayes factor of O'Hagan (1995). We apply our procedure to normal populations, when noninformative prior is assumed to the model parameters. We derive explicit form of Bayes Factors when the number of populations is greater than 3. A famous data is analyzed by the proposed procedure. For this example, the suggested method is straightforward for specifying distributionally and to implement computationally, with output readily adapted for required comparison.

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Speed characteristic comparison of PI controller and SLMC in SRM drives (SRM 드라이브에서 PI 제어기와 SLMC의 속도 특성 비교)

  • Kim Jin-young;Choi Jae-dong;Ahn Jae-Hwang;Oh Seung-Up;Ju Hyung-Jun;Seung Se-jin
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.34-37
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    • 2001
  • In this paper the comparison of conventional PI control and nonlinear sliding mode control is presented for Switched Reluctance Motor(SRM). SRM drives require a nonlinear controller for high dynamic Performance but the high nonlinearity makes a poor performance in conventional PI control. However SRMs with sliding mode control achieve a robust performance for speed control. In this paper nonlinear sliding mode controller is suggested for high performance speed. State equation and modeling are proposed. And we present the speed comparison of PI control and SLMC.

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Position Value for Relative Comparison of Healthcare Status of Korea in 2016 (2016년 한국 보건의료의 상대적 위치와 추이: 경제협력개발기구 국가와 비교)

  • Oh, Sarah Soyeon;Park, Eun-Cheol
    • Health Policy and Management
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    • v.29 no.1
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    • pp.90-97
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    • 2019
  • This study investigated the healthcare status of South Korea and member states of the Organization for Economic Cooperation and Development (OECD). By employing the position value for relative comparison index, healthcare status was measured through the following components: demand, supply, accessibility, quality, and cost. Statistical analysis was conducted through the Mann-Kendall test from analyzing trends from 2000 onwards. Results showed that while Korea, on average, scores higher than the OECD average in most of the investigated components, it is below average in certain indexes including primary care and mental health care. Considering the various health issues that have been raised about these indexes, it is important these components be improved upon by policy-makers.

Social Comparison Theory and Interpersonal Contact: The Influence of Incidental Envy on Contacting Higher or Lower Status Others

  • Youn, Y. Jin;Park, Kiwan
    • Asia Marketing Journal
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    • v.20 no.2
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    • pp.41-63
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    • 2018
  • Incidental envy influences behavior in various domains. However, no research, to date, has investigated whether incidental envy influences interpersonal behavior toward others who are unrelated to the emergence of the emotion. That is, the literature is silent on how those who experience incidental envy engage in interpersonal contact and how this may affect consumers. In this paper, we address this question by investigating the influence of incidental envy on interpersonal contact with others of higher or lower status based on the social comparison theory. We demonstrate that incidental envy (versus a neutral emotion) motivates people to contact higher status others to facilitate upward assimilation (experiments 1 and 2). We also show that when competition (a situational factor that heightens the personal relevance of the interaction with the target) is involved, individuals who feel envy (versus a neutral emotion) are more likely to contact lower status others to engage in downward contrast (experiment 3). We conclude with a discussion of the practical implications of our findings.

On Some Properties of Amount of Information

  • Kim, Jae-Joo;Suh, Kil-Won
    • Journal of the Korean Statistical Society
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    • v.4 no.2
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    • pp.97-109
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    • 1975
  • To gain knowledge about the unknown state $\theta$ of nature, we perform experiments. Sufficiency of an experiment for another experiment has been introduced for the comparison of experiments. The knoledge before and after an experiment makes it possible to discuss the amount of information provided by the experiment.

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Triterpenes from the Seeds of Phytolacca sp.

  • Kang, Sam-Sik;Woo, Won-Sick
    • Korean Journal of Pharmacognosy
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    • v.17 no.1
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    • pp.55-61
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    • 1986
  • Direct comparison of the triterpenoids isolated from the seeds of Phytolacca sp. and synthetic compounds confirmed that the natural products were acetylaleuritolic acid and 3-acetylmyricadiol rather than epiacetylaleuritolic acid, acetyloleanolic acid and phytolaccanol.

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