• Title/Summary/Keyword: 디커플링 지수

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Study on Blast Effects of Decoupling Condition and Polymer Gel Coupling in Single Blast Hole by Numerical Analysis (디커플링 조건 및 폴리머 겔 적용에 따른 발파공 발파위력 영향에 관한 수치해석 연구)

  • Ko, Young-Hun;Jung, Seung-Won;Yang, Hyung-Sik
    • Explosives and Blasting
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    • v.36 no.2
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    • pp.1-9
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    • 2018
  • In this paper, AUTODYN blasting simulation of single blast hole were conducted to evaluate the blasting effects of Polymer Gel. The coupling mediums used as the filling material around an explosive charge were air and gelatin. each simulation case was D I(decoupling index) 1.0, 1.25, 1.56 with air or polymer gel coupling materials. In order to evaluate blast effects full charge model was used as a reference for evaluation of blasting effects. The results of numerical analysis showed that fragmentation of a limestone model of were much more fractured by polymer gel medium than by air medium. As expected, the transmitted peak pressure was higher polymer gel coupled model than in air medium.

Decomposition and Decoupling of $CO_2$ emission in Korea's manufacturing industry (국내 제조업의 이산화탄소 배출 변화요인 및 디커플링 분석)

  • Kim, Yu-Jeong;Kim, Seong-Yong
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.10a
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    • pp.375-378
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    • 2008
  • This paper aims at identifying the factors that have influenced changes in the level of industrial $CO_2$ emissions. By means of complete decomposition method the observed changes are analyzed into five different factors: output level, energy intensity, energy mix and structural change and utility use. The application study refers to the manufacturing sectors in Korea. Moreover, this paper discusses the relationship between Korea's manufacturing $CO_2$ emission and economic growth (as measured by GDP), investigating whether economic growth is decoupling from $CO_2$ emission.

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Numerical Study on the Reduction of Blast-induced Damage Zone (최외곽공 주변암반의 발파굴착 손상영역 저감에 관한 수치해석적 연구)

  • Park, Se-Woong;Oh, Se-Wook;Min, Gyeong-Jo;Fukuda, Daisuke;Cho, Sang-Ho
    • Explosives and Blasting
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    • v.37 no.3
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    • pp.25-33
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    • 2019
  • Controlling the blast-induced damage zone(BDZ) in mining excavation is a significant issue for the safety of employees and the maintenance of facilities. Numerous studies have been conducted to accurately predict the BDZ in underground mining. This study employed the dynamic fracture process analysis (DFPA) to estimate the BDZ from a single hole blasting. The estimated BDZ were compared with the results obtained by Swedish empirical equation. The DFPA was also used to investigate the control mechanism of BDZ and fracture plane formation around perimeter holes for underground mining blasting.