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FW-H 방법을 이용한 잠수함 표면 처리에 따른 소음 전산 해석
김승기(Seunggi Kim),유재영(Jaiyoung Ryu) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Submarine has been performed for national defense activities representatively. Underwater Radiated Noise (URN) which emitted during underwater vehicle operation is directly related to the survivability of the underwater vehicle. This study focused on examining the effects of surface treatment on noise aspects in submarine. Numerical simulations were conducted for two cases : smooth surface as a reference case, and V-type riblet. To solve the incompressible fluid flow passing the submarine, the Reynolds-averaged Navier-Stokes equation coupled with the k-ω SST turbulence model was used. As a result of examining the noise radiation around the submarine, it was confirmed that it was necessary to pay attention to the noise radiation effect in the middle part of the submarine body. And the results indicate that overall sound pressure level can be reduced about maximum 4 dB at far-field by applying riblet surface. This study provides more enhanced understanding about the surface design on underwater vehicles to reduce underwater radiated noise.
GIFTED EDUCATION IN MONGOLIA: Current Status and Future Directions
절자야 바야르사이한,한기순 순천향대학교 SCH특수아동교육연구소 2020 특수·영재교육저널 Vol.7 No.1
The purpose of this study is to analyze the situation in Mongolia's gifted education and to define the current status and future direction of Mongolia's gifted education. There is almost no awareness of special education for the gifted within Mongolia. Currently, Mongolia recognizes the need for this and is seeking to put it into practice in earnest. This research introduces a system for structuring special education for the gifted within the Mongolian educational context, and talent development in the light of the above situation. The object of this study is to present a detailed search into concepts and policies for special education of the gifted in Mongolia. The study is organized into an examination of data and literature on the topic and is based on the most recent research of scholars who are promoting the need for special education for the gifted. This study investigates concepts for such education in the Mongolian educational system, which have been examined over a long period and presents factors that will lead to effective and adequate education, influence and transformation within the conventional educational system. Up until now, Mongolian education has followed the Russian system. However, recently Mongolia has also been studying other systems across the whole world and has reorganized its educational goals accordingly to improve the effectiveness of its educational program. This paper will be useful for the future development of policies for Mongolian special education for the gifted, and it is expected that this will provide basic and meaningful information, which will result in a better understanding of its programs and consequent development.