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이현규 베뢰아대학원대학교 2000 사도신학 Vol.2 No.-
In these days, the teenage problem is not just a social problem but a religious one including Christianity. Of course, the causes of teenage problem can be talked in different points of view but in Christian point of view, the depth of young Christians' beliefs is the main cause of their problems. Moreover, their beliefs have a strong effect on their self-consciousness in their teenage period. The result of this study on the idea showed that there is a positive relation between teenage believers' religious maturity and their self-consciousness. This means as the religious maturity grows, the self-consciousness also gets improved. Therefore, the teenagers having mature Christian beliefs surely have self-consciousness. But, on the other hand, teenagers who are not religiously matured can be assumed to have high chances of bringing various teenage problems. So managers or educators in church need to pay more attention to developing the teenagers' religious beliefs by carrying out more concrete and organized education system
이현규,이정수,김동화,조진수 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.10
Hole-type pre-swirl nozzle was optimized using CFD analysis and experiments. CFD methodologies were validated by comparing the CFD results with experiments. Four design variables were considered in the optimization process: nozzle inlet length ( L ), outlet length ( l ), inlet diameter (D), and radial location (r p ). The optimization process included the optimal Latin hypercube design sampling method with the Kriging surrogate model and genetic algorithm. The single-objective optimization was performed to maximize the discharge coefficient. Results showed that the optimized nozzle reduced total pressure losses and increased mass flow rate. Total temperature drop effectiveness was increased from 0.07 to 0.29. The total temperature in pre-swirl system could be characterized as the reduction in temperature by nozzle acceleration and elevation by aerodynamic losses due to friction and viscous effects in the system. The optimized model showed a discharge coefficient of 0.846, which was 31.7 % higher than the baseline condition. By improving the discharge coefficient , the pre-swirl system reduced aerodynamic losses, and the mass flow rate was increased at certain pressure ratios or satisfied the pressure margin for blade cooling.