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다공관 출구로부터 방사된 충격성 소음에 관한 실험적 연구
허성욱(Sung-Wook Heo),제현수(Hyun-Su Je),양수영(Soo-Young Yang),이동훈(Dong-Hoon Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This experimental study describes the propagation characteristics and suppression of the impulse noise emitted from the exit of<br/> a perforated pipe attached to the open end of a simple shock tube. The experiment is performed through the systematic change of<br/> the shock wave Mach number and the geometrical parameters such as the porosity, hole diameter and length of the perforated pipe.<br/> The experimental results for the near and far sound field are presented and explained in comparison with those for a straight pipe.<br/> The results obtained show that for the near sound field the impulse noise strongly propagates toward to the pipe axis, but for the far<br/> sound field the impulse noise uniformly propagates toward to the all directions, indicating that the directivity pattern is almost same<br/> regardless of the pipe type. Moreover, the noise reduction performance of perforated pipe depends upon the condition of sound field.<br/> For the near sound field the perforated pipe has a little performance to suppress the impulse noise, but for the far sound field the<br/> perforated pipe has little performance to suppress the impulse noise.
Maternal Separation Does Not Produce a Significant Behavioral Change in Mice
Shawn Tan,Hin San Ho,송윤수,Joey Low,제현수 한국뇌신경과학회 2017 Experimental Neurobiology Vol.26 No.6
Early life adversities together with genetic predispositions have been associated with elevated risks of neuropsychiatric disorders during later life. In order to investigate the underlying mechanisms, many chronic, early-life stress paradigms in multiple animal models have been developed. Previously, studies reported that maternal separation (MS) in the early postnatal stages triggers depression- and/or anxiety-like behaviors in rats. However, similar studies using mice have reported inconsistent behavioral outcomes. In this study, we sought to assess behavioral outcomes from two different early-life stress paradigms; a conventional 3-hour MS and a maternal separation with early weaning (MSEW) paradigm using C57BL/6J male mice with independent cohorts. Our data demonstrated that both MS and MSEW paradigms did not produce reported behavioral anomalies. Therefore, MS paradigms in mice require further validation and modification.