• 한국자동차공학회논문집
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• 제15권5호
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• pp.146-152
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• 2007

Recently, The air pollution problems become hot issues as the production of the diesel automotive increases. The ministry of environment has enforced a precise inspection law to decrease the vehicle emission. In this circumstances, the smoke measurement is somewhat complicated by the use of the different type smoke meters. Although the paper filtration type opacimeter has been used for measuring smoke widely but currently the light extinction type is being used for precise inspection law. These two type opacimeters are different in their measuring principles on each other. So, for the time being the regulation standards can be confused by these two type opacimeters. In this article, The correlation factor between these two type opacimeters is studied by using engine dynamometer and vehicle test. The result of the dynamometer test shows the light extinction type is more sensitive than the filtration type by 1.47 times. But the relation factor by the vehicle test achieved 1.37 value, which is lower than that of the dynamometer test. In the future study the more precise research is needed to estimate the relation factor on vehicle test.

• 한국안전학회지
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• 제22권6호
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• pp.13-19
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• 2007

Diesel car's smoke measurement equipment and method were investigated based on the exhaust gas regulations. Reflection photo method and light extinction method for measuring smoke were compared under conditions of both no load mode and Lug-down 3 mode. Free acceleration mode at no load condition was used for regular inspection of diesel car, and Lug-down 3 mode was used for fine inspection of the diesel car. A correlation between no load mode and Lug-down 3 mode was investigated in this research. The smoke measured with reflection photo method was 1.5${\sim}$2 times higher than that of light extinction method The correlation coefficient between reflection photo method and light extinction method for measuring smoke was 0.83, which shows comparatively high correlation between the two methods for measuring smoke in diesel engines.

• 대한토목학회논문집
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• 제28권4B호
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• pp.421-428
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• 2008

최근 들어 우리나라 전해역에 걸쳐 발생하고 있는 침식은 사회적인 문제가 되어왔다. 하지만, 해안구조물에 의한 기존의 방법으로 해안선을 보호하는 것이 "파랑장에 친화적인가?"라는 관점에서 개선의 여지가 있다. 새로운 형식의 철재형 이안제는 권혁민 등(2007)에 의해 제안되었다. 본 형식은 다수의 파일과 상부에 파랑진행방향과 수평으로 설치된 소파장치로 구성되어 있다. 본 형식은 해수유통원활, 대수심 축조수월, 공기단축 등의 장점이 있다. 본 연구는 소파제로서 철재형 이안제의 상부에 거치가 가능한 이열 조합판의 투과율을 실험적으로 평가했다. 일방향 불규칙파 시스템에 의한 모형실험을 통하여 반사율, 소파율, 투과율에 관하여 분석했다. 실험결과, 파형경사가 클수록 그리고 조합판의 폭-파장비가 클수록 투과율이 작아짐을 보였다. 본 연구는 이열 소파판 조합에 대하여 투과율 산정을 위한 직선식을 제안했다.