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리모델링 전·후 공연예술연습공간의 주관적 음향성능 평가
남승훈(Seung Hoon, Nam),김재수(Jae-Soo, Kim) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
With the recent improvement in the cultural level and the quality of life, one requires small-sized cultural and practice spaces, which are absolutely insufficient. So the central and local governments have created performing arts practice spaces to provide stable performing arts practice spaces and community spaces by remodeling neglected idled public facilities. However, creation of such performing arts practice spaces focuses only on improvement in spacial form, interior design, and physical acoustic performance. So satisfaction with subjective acoustic performance following remodeling is not evaluated and it is difficult to say that good acoustic performance has been secured. From this perspective, this study aimed to use auralization to assess responses to and changes in subjective acoustic performance of representative spaces following remodeling on the basis of the data from the previous research.
남승훈(Seung Hoon Nahm),김동균(Dong Kyun Kim),박종서(Jong Seo Park),김엄기(Amkee Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
This paper presents an overview of the mechanical properties of carbon nanotubes. The<br/> characteristics of carbon nanotubes were briefly introduced. We then present briefly the experimental<br/> techniques used to measure mechanical properties and the results obtained by other researchers. A<br/> carbon nanotube is too small to be pulled apart with standard tension devices. Manipulators should be<br/> used for mechanical testing. We introduced manipulation methods using nanomanipulators under<br/> field-emission scanning-electron microscope.
남승훈(Seung Hoon, Nam),김재수(Jae-Soo, Kim) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
University performance halls, which are still recognized as spaces only for lectures and events, are provided with very short reverberation time and have defects corrected with electric sound in building and remodeling. So the complaint has been made that they may have difficulty in allowing audience to appreciate music with a mellow sound due to insufficient reverberation for performances, including concerts. In addition, poor satisfaction with subjective acoustic performance in audience, despite the improvement in physical acoustic performance, following remodeling causes dissatisfaction. From this perspective, this study aimed to examine the changes in subjective satisfaction with the improvement in acoustic performance through auralization test on the basis of the field measurements of the performance hall in W University, which has recently been remodeled according to the data from the previous research, and the simulation data with improved acoustic performance appropriate for a multi-purpose hall.
체적에 따른 국악 공연장의 잔향시간 분포 및 상관성 분석
남승훈(Nam Seung Hoon),김재수(Kim Jae-Soo) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
Korean traditional music is a unique type of music that exists only in Korea unlike Western music. As Pansori and Korean traditional music have been performed in multi-purpose halls and concert halls, which are venues designed mainly for Western music, the need for venues that are appropriate for Korean traditional music performance has been pointed out. In addition, this area involves a lot of challenges since there have yet to be systematic researches on reverberation time that is ideal for Korean traditional music halls. In this regard, the present study compares the reverberation time proposed in the preliminary study with that proposed by Knudsen-Harris in order to grasp the range of reverberation time. Based on the result, the correlation between reverberation time and volume depending on the frequency is analyzed additionally. It is expected that the findings will be useful in specifying the range of optimum reverberation time for Korean traditional music halls that are suitable for the domestic condition.
남승훈(Nam Seung Hoon),김재수(Kim Jae-Soo) 대한설비공학회 2016 대한설비공학회 학술발표대회논문집 Vol.2016 No.11
Korean traditional music is a unique type of music that exists only in Korea unlike Western music. As Pansori and Korean traditional music have been performed in multi-purpose halls and concert halls, which are venues designed mainly for Western music, the need for venues that are appropriate for Korean traditional music performance has been pointed out. Accordingly, a variety of acoustic materials on Korean traditional music halls are necessary, but there have yet to be systematic researches on reverberation time and absorption elements inside a venue. In this regard, the present study analyzes the correlation among absorption elements (room constant, absorbing power, and average absorbing coefficient) inside a venue based on the proper reverberation time suggested in the preliminary study. It is expected that the findings will be useful in specifying the range of optimum reverberation time for Korean traditional music halls that are suitable for the domestic condition.
남승훈(Seung Hoon, Nam),김재수(Jae-Soo, Kim) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
With the recent improvement in the quality of life and cultural level for the people, the central and local governments take interest in activation of culture and arts; however, there have been absolutely insufficient spaces for practicing performing arts by now. So the government tries to make greater use of idle public facilities, which have been neglected, aged, for years, and provide stable practice spaces in support of creative activities of local arts groups. The development of such idle public facilities into performing arts practice spaces requires security of acoustic performance appropriate for their use as well as improvement of the aged facilities. From this perspective, this study aimed to determine the degree of improvement and changes in acoustic performance following remodeling of Hanpac Practice Room in Seoul, which has recently been remodeled, on the basis of the data from the previous research. The data from this study are expected to be useful in remodeling similar performing arts practice spaces.
리모델링 전·후 공연예술연습공간의 체적과 음향성능 평가지수와의 상관성 분석
남승훈(Seung Hoon, Nam),김재수(Jae-Soo, Kim) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
Aged idle public facilities have recently been neglected, empty, in urban areas, causing social problems. So the central and local governments have tried to remodel such spaces into performing arts practice spaces with the objective of improving local culture and arts and forming cultural communities. Formation of performing arts practice spaces requires prediction of acoustic performance before and after remodeling at the stage of design; however, lack of data is causing lots of difficulty. From this perspective, this study aimed to analyze correlation between the volume and the acoustic performance assessment index before and after remodeling on the basis of the data from the previous research. These data are expected to be very useful at the design and construction stages in remodeling performing arts practice spaces.
UNSM 처리한 베어링 강재의 VHCF 피로 및 파단특성
남승훈(Seung-Hoon Nahm),서민수(Min-Soo Suh),서창민(Chang-Min Suh),편영식(Young-Sik Pyun) 대한기계학회 2018 大韓機械學會論文集A Vol.42 No.6
사용된 베어링강의 UNSM처리효과와 기가사이클 설계기준에 필요한 VHCF 회전굽힘피로특성을 구하기 위한 피로시험을 거쳐 미시적인 파면해석과 EDS 분석을 통하여 표면과 내부에서 파괴되는 기구를 파괴역학적으로 연구하였다. 베어링강은 UNSM처리재와 미처리재중 경면상태의 경우는 duplex S-N 곡선이 얻어졌고, 가공상태의 경우는 표면조도가 크므로 이중 S-N곡선이 형성되지 않았다. 또 미처리재에 비해서 UNSM처리재는 표면의 나노(nano)조직화, 표면경도 상승, 표면조도 감소 및 압축잔류응력형성에 의하여 10⁶ 사이클 피로한도에서 약 28 % 정도 상승하는 경향을 나타내었다. 또 HCF(장수명피로) 범위에서는 표면을 기점으로 하는 표면결함에서 발생한 표면균열에 의해 파괴되는 형태를 취하였고, VHCF(초장수명피로, Nf >10⁶ 사이클) 범위에서는 내부에서 피로균열이 형성되는 어안균열이 주요 파괴기구로 되었다. 이 어안균열은 개재물의 흔적이 명확한 TiN개재물에서 주로 발생하였다. 개재물의 △K는 5 ㎫√m에 접근하며, 또 어안균열의 △K는 10 ㎫√m에 접근하였다. This study was to investigate the influence of ultrasonic nanocrystal surface modification (UNSM) effects on very high cycle fatigue(VHCF) strength and fracture mechanism of a bearing steel. In case of mirror finished specimens with and without UNSM treatment after machined surface, the duplex S-N curves were obtained, but in case of unpolished machined surface condition, the duplex S-N curves were not formed. The UNSM treated specimen showed a tendency to increase about 28% in the fatigue limit of 10⁶ cycles due to the refined structure to nanocrystal, the increased surface hardness, the decreased surface roughness and the increased compression residual stress. In the range of HCF, the fracture was caused by the surface crack generated by the surface defects originating from the surface. In the VHCF range, the dominant fracture mechanism was the fish-eye crack in which the internal originating fracture type was formed. The central part of the fish-eye where cracks initiated was inclusion consist of TiN. The stress intensity factor range (ΔK) of inclusions and fish-eye cracks approached 5 ㎫√m and 10 ㎫√m respectively.