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표영민(Yeongmin Pyo),이석주(Seokju Lee),김대식(Daesik Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.5-3
Lean premixed gas turbine combustors were successful in meeting current NOx emission regulations. However, these have been found to be susceptible to comvustion instability. The combustion instabilites result from the feedback relationship between heat release perturbations and acoustic pressure oscillations in the combustor. Therefore, the acoustic characteristics in the system are the key parameters in determining combustion instability behavior in the gas turbine combustors. In this study, in order to predict acoustic field correlated by combustion driven oscillations, in-house thermoacoustic network model was developed. The model is based upon physical conservation equations and 1-D acoustic theory, and provide information on the frequency and initial growth rate for the combustion instability. The prediction results show a good agreement with measurements under the selected combustion system and operating conditions. Also, it was found that the change in a system length influenced the longitudinal instability characteristics such as mode shape and frequencies.
이향미(Yi, Hyangmi),임청룡(Lim, Cheoungroung),이석주(Lee, Seokju),서상택(Seo, Sangtaek) 한국농식품정책학회 2018 농업경영정책연구 Vol.45 No.1
In this study, we investigated the characteristics of individual farms and their regions that influenced the selection of farming enterprise. This is considered as a prerequisite in the introduction of crop diversification in rice fields which has been reviewed as a solution to the structural problem of rice oversupply in South Korea. It is, in general, necessary to analyze the regional influence as well because farming systems in individual farms are not influenced by the characteristics of individual farms only. They are also influenced by the characteristics of the regions the farms belong to. In this study, the factors influencing the selection of farming by the paddy rice farmers were analyzed using data obtained from the 2015 Agriculture and Forestry Census. Integrating the analytical results from the study, we presented the following policy proposals for the introduction of rice production adjustment system , such as expanding the rental business of agricultural machinery, strengthening information education, establishing the conditions for the wide use of agricultural land, systematizing the supply and demand of agricultural manpower, and preferential support for the organized management body.