http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
방송용 다목적 홀에서 배너 가변에 따른 음향 환경 변화
박호철,서로사,서춘기,전진용,Park, Ho-Cheul,Seo, Rosa,Seo, Chun-Ki,Jeon, Jin Yong 한국음향학회 2019 韓國音響學會誌 Vol.38 No.5
스피치, 국악, 뮤지컬, 대중음악과 콘서트까지 다양한 장르의 공연이 이루어지는 방송용 다목적 홀의 경우 공연에 필요한 전기, 건축 음향적 요구 조건이 다양하다. 하지만 실제 음향 환경 가변을 위한 효율적인 운용 방법은 많지 않다. 본 연구는 무대 반사판의 설치 유 무와 전기 음향 사용 조건하에서 배너의 가변에 따른 홀의 음향 환경 변화를 살펴보았다. 그 결과 벽체 면적의 15 %에 해당하는 배너를 설치한 실제 측정에서 잔향 시간(Reverberation Time, $T_{30}$)은 최대 0.12 s, 초기감쇠시간(Early Decay Time, EDT)은 0.15 s, 음악 명료도(Clarity, $C_{80}$)는 0.76 dB, 음성 명료도(Definition, $D_{50}$)는 6.43 % 변하였다. 배너의 면적을 확장시킨 컴퓨터 시뮬레이션을 통해 전체 벽체 면적의 40 %에 해당하는 배너를 설치할 경우 잔향 시간은 0.11 s에서 최대 0.55 s까지 가변되는 것을 확인했다. When used for broadcasting, multipurpose halls need to accommodate various types of programs such as speeches, Korean traditional music, musicals, pop music, and concerts. Therefore, multipurpose halls must meet a wide range of electric and architectural acoustic demands. However, there are few ways to alter acoustic environments for multipurpose halls, given these different demands. The current study investigates the effects of banners on acoustic environments in the presence of an acoustic shell or electric acoustic system. The results indicate that the installation of a 15% banner of wall area could vary the range of reverberation time ($T_{30}$) by 0.12 s, EDT (Early Decay Time) by 0.15 s, clarity of music ($C_{80}$) by 0.76 dB, and clarity of speech ($D_{50}$) by 6.43 % under different measurement circumstances. A computer simulation that enlarges the banner size to 40 % of the wall area varies the reverberation time from 0.11 s to 0.55 s depending on the room environment.
역할극 놀이를 통한 아동의 사회조망능력 향상에 관한 연구
박호철 한국아동교육학회 1993 아동교육 Vol.3 No.1
The purpose of this study is to examine the effect of the role-play of the elementary school's lower grade students on their social perspected taking improvement. To accomplish this purpose, this study set the following hypotheses 1. Experimental group will have more high-score than control group in cognitive perspective taking test. 2. Experimental group will have more high-score than control group in affective perspective taking test. 3. Boys will have more high-score than girls in cognitive perspective taking test. 4. Girls will have more high-score than girls in affective perspective taking test. For investigating this study, choose the 40 elementary school's lower grade students in Pusan City. And devided two group (experimental group, control group). Each group has been pre-test. An experimental group had been carried out role-play but control group had not been contacted. After 12 days long performed role-play each group has post-test. The result of this study is summarized as follows. 1. Children's cognitive perspective taking did not improvement through the role-play. 2. Children's affective perspective taking did improvement through the role-play. 3. There was no significance difference in cognitive perspective taking between two sex. 4. There was no significance difference in affective perspective taking between two sex.
박호철,박지선,신영도,강재희,오주형,류경남 대한혈관외과학회 2001 Vascular Specialist International Vol.17 No.1
Adventitial cystic disease of the popliteal artery is a rare disorder that causes localized stenosis or occlusion by compression of the vessel lumen. The disease produces lower extremity claudication, typically in young and middle-aged men. We report a case of the adventitial cystic disease of the popliteal artery in a 55-year-old man with symptom of left calf claudication. Diagnosis was done by ultrasound, angiography, and magnetic resonance imaging. The patient was treated with resection of the diseased popliteal artery followed by interposition of saphenous vein graft. Postoperatively, the symptom and sign resolved completely.
$SiO_2$가 유리섬유로 보강된 고분자 겔 전해질의 전기 화학적 특성에 미치는 영향
박호철,김상헌,전종한,김동원,고장면,Park Ho Cheol,Kim Sang Heon,Chun Jong Han,Kim Dong Won,Ko Jang Myoun 한국전기화학회 2001 한국전기화학회지 Vol.4 No.1
유리섬유(glass fiber cloth, GFC)가 보강제로 사용된 고분자 겔 전해질(polymeric gel electrolytes, PGEs)에 $SiO_2$를 첨가하여 전해질의 전기 화학적 특성을 조사하였다. 가소제로는 Ethylene carbonate(EC) , propylene carbonate(PC), diethyl carbonate(DEC)를, 리튬염으로는 $LiClO_4$를 고분자로는 polyacrylronitrile(PAN)과 poly(vinylidene fluoride-co-hexafluoro propylene)(P(VdF-co-HFP))을 사용하여 $80\~90{\mu}m$의 두께로 전해질을 제조하였다. 제조된 전해질은 모두 상온체서 $10^{-3}S/cm$의 이온 전도도를 나타내었고, 4.8V까지 안정하였다. 리튬금속을 사용하여 제조된 셀의 임피던스 결과에서는 시간이 지남에 따라 모든 전해질이 부동태 피막의 성장으로 계면저항이 증가했으나, $SiO_2$첨가비율에 따라 뚜렷한 차이는 보이지 않았다. $LiClO_2$와 mesophase pitch-based carbon fiber(MCF)를 각각 양극과 음극으로 사용하여 제조된 겔의 임피던스에서는 $SiO_2$가 첨가되지 않은 셀의 옴 저항이 충전, 방전이 진행되는 동안 많은 변화를 보였으며, $SiO_2$가 첨가된 셀의 저항은 거의 변화되지 않았고, 계면의 변화도 적었다. 또한 방전용량에서도 $SiO_2$가 $20\%$가 첨가된 전해질이 0.2C의 방전속도에132mAh/g의 비 용량을 나타내었고, 2C의 방전속도에서$85\%$의 방전용량을 유지하였다. [ $SiO_2$ ] effect on the electrochemical properties of polymeric gel electrolytes(PGEs) reinforced with glass fiber cloth(GFC) was investigated . PGEs were composed of polyacrylronitrile(PAN), poly(vinylidenefluoride-co-hexafluoropropylene) (P(VdF-co-HFP)), $LiClO_4$ and three kind of plasticizer(ethylene carbonate, dietyl carbonate, propylene carbonate). $SiO_2$ was added to PGEs in the weight fraction of 10, 20, $30\%$ respectively. PGEs containing $SiO_2$ showed conductivity of over $10^{-3}S/cm\;at\;23^{\circ}C$ and electrochemical stability window to 4.8V. In the impedance spectra of the cells, which were constructed by lithium metals as electrodes, interfacial resistance increased due to growth of passivation layer during storage time and remarkable difference was not observed with content of $SiO_2$. In the impedance spectra of the lithium ion polymer batteries consisted of $LiClO_2$ and mesophase pitch-based carbon fiber(MCF), ohmic cell resistance of $SiO_2-free$ PGE was changed continuously with number of cycle, but those of $SiO_2-dispersed$ PGEs were not. Discharge capacity of the PGE containing $20wt\%\;SiO_2$ showed 132 mAh/g at 0.2C rate and $85\%$ of discharge capacity was retained at 2C rate.