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Theoretical Analysis on Transient Torsional Vibrations of Two Stroke Low Speed Diesel Engines
Lee, Don-Chool,Kim, Sang-Hwan,Yu, Jung-Dae The Korean Society of Marine Engineering 2007 한국마린엔지니어링학회지 Vol.31 No.3
Theoretical analysis on transient torsional vibration was started from the early 1960s for high power synchronous motor application. Particularly. its simulation and measuring techniques in marine diesel engine field have been steadily studied by some classification societies and large marine diesel engine designers. This paper introduces the simulation method on transient torsional vibration of two stroke low speed diesel engine using the Newmark method.
High CO₂ Controlled Atmosphere Storage of Korean Ginseng Roots
Sang Don Yun,Seung Koo Lee 한국원예학회 2005 Horticulture, Environment, and Biotechnology Vol.46 No.1
The effects of high CO₂ controlled atmosphere (CA) conditions on the quality of ginseng roots were investigated. High CO₂ atmosphere (10% O₂ + 90% CO₂) inhibited the incidence of decay development in ginseng roots. The ginseng roots were infected only 10% in high CO₂ storage after 5 months, whereas all of the roots were infected in air storage. The incidence of internal cavity in fresh and processed ginseng roots by high CO₂ atmosphere. The internal cavity of steamed ginseng processed from the air stored ginseng roots was a serious problem in ginseng industry. The internal cavity of the roots gradually increased during storage. However, high CO₂ CA storage remarkably reduced the occurrence of internal cavity in steamed ginseng roots.