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박현구,조경숙,송혁,김선우 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1
The aim of this study is to analyse the relationship between traffic noises and subjective responses. The traffic noises considered in this study were aircraft, road traffic and train, and we recorded them in order to edit by using the sound insulation performance of windows. The sound sources recorded and edited were made to be different sound level with 5 steps by 5dB. Finally 100 sounds sources were composed for the purpose of psychoacoustic experiments and we surveyed the subjective responses. As a result, the average points of the subjective response to the sound sources have shown differently depending on their sound level, the type of windows and the type of sound sources.
박현구,조경숙,김선우 대한건축학회 2003 대한건축학회논문집 Vol.19 No.2
This study has performed to analyse the measurement the main hall of Catholic churches and to find out general room acoustical characteristics. Furthermore, extracted data could be used in subjective evaluation for optimum values of each physical parameter. For the reason, we surveyed whole Catholic churches located in Gwangju metropolitan city and finally chose 11 churches to measure. Room volume of buildings chosen is ranged widely from 1,782 to 9,195 cubic meter so that measured values can be distributed including various characteristics of acoustical parameters. As a result, the differences of values using PA system as sound source were larger than those using omnidirectional speaker in the center part of alter and values of D50 and C80 in the balcony floor were especially appeared to have different values comparing with those of main floor due to diversified layout of speakers. The range of RT and EDT was from 1 to 3 sec. approximately depending on the room volume and sound absorbing materials installed on floor, wall and ceiling and it was revealed that RT at 250㎐ of center frequency range was shortest and RT at 1㎑ was largest as most of the materials applied to finishing were panel absorbers and reflectors such as wood panel, concrete and brick.
조인숙(Jo, In-Sook),박경옥(Park, Kyoung-Ok),최병숙(Choi, Byoung-Sook),김도연(Kim, Do-Yeon),윤영호(Yoon, Young-Ho) 한국주거학회 2019 한국주거학회 논문집 Vol.30 No.6
The purpose of this study is to suggest the housing operation ways that respond to the needs of young people for the supply of ‘Shared Public Support Private Rental Housing’ under the「Special Act on Private Rental Housing」. This research conducted the interview on the existing shared housing operators and the planners to supply and operate ‘shared public support private rental housing’ and the survey on the interested youth. In-depth interviews were conducted using a semi-structured research tool to analyze 11 people from June 7, 2018 to July 26, 2018. The online survey of 129 young people was conducted from July 12 to 30, 2018, analysed by the SPSS program for frequency, mean, and chi-squared test. The conclusions of this study are as follows. For the planning of shared house it is needed: the principle of 1 room for 1 person, the design for separation of private and shared spaces, facilities for safety from fire and crime, and the plan for a common living space considering community activities. For the operation of shared house it is needed: larger home appliances considering frequent in and out moves and lower economic power of young people, various ways of acceptance decision considering non-income factors for shared housing, education for common life, programs for community life and communication, specialists for operation, and diversified contract period.
조경숙(Jo, Kyoung-Sook),황대선(Hwang, Dae-Sun),조연(Cho, Yeo),허덕재(Hur, Deog-Jae) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.5
In this study, the sensitivity of annoyance was investigated by the subjective jury test for the variations of the frequency components along with various sound pressure levels of sixteen environmental noise sources. Annoyance was, also, evaluated for the road traffic noises. Sound pressure levels were $54{\sim}84\;dB$ which individually divided frequency components with eight bands of equally three bark bands. The results show that vehicle traffic noise is recognized as the most serious environment noise source. The sensitivity of human perception of annoyance in frequency bands is quite different from A-weighting curve. The annoyance found out to be more sensitive in high frequency region and reached its maximum in 3.4 kHz.
Gas-Pressure-Assisted Modified One-Step Deposition for Hybrid Perovskite Solar Cells
Jo, Mansik,Cho, Seulki,Jang, Jihun,Song, Sangwoo,Moon, Kyoung-Sook,Koo, Sang-Mo,Moon, Byungmoo American Scientific Publishers 2017 Journal of nanoelectronics and optoelectronics Vol.12 No.12
<P>In recent years, hybrid organic-inorganic perovskites have attracted much attention as promising light absorbers. Herein, the gas pressure during spin coating for a perovskite layer is introduced as a parameter for perovskite solar cells. We adopt gas pressure engineering to improve the perovskite film morphology without overgrown crystals and pin-holes. As a result, compared to 8.95% efficiency of conventional two step fabrication, perovskite solar cells based on gas-pressure-assisted method showed similar efficiency of 8.48% but increased the current density from 16.28 mA/cm(2) to 15.69 mA/cm(2), even though it reduced processing time and steps. These findings will provide important guidelines for the fabrication of low-cost perovskite solar cells.</P>
( Kyoung Sook Park ),( Ea Wha Kang ),( Tae Ik Chang ),( Wonji Jo ),( Jung Tak Park ),( Tae-hyun Yoo ),( Shin-wook Kang ),( Seung Hyeok Han ) 대한신장학회 2021 Kidney Research and Clinical Practice Vol.40 No.3
Background: The use of newly developed mixed-dilution hemodiafiltration (HDF) can supplement the weaknesses of pre- and postdi-lution HDF. However, it is unclear whether mixed-HDF performs well compared to predilution HDF. Methods: We conducted a prospective, open-labeled, randomized controlled trial from two hemodialysis centers in Korea. Between January 2017 and September 2019, 60 patients who underwent chronic hemodialysis were randomly assigned at a 1:1 ratio to re-ceive either predilution HDF (n = 30) or mixed-HDF (n = 30) for 6 months. We compared convection volume, changes in small- and medium-sized molecule clearance, high-sensitive C-reactive protein (hs-CRP) level, and dialysis-related parameters between the two dialysis modalities. Results: A mean effective convection volume of 41.0 ± 10.3 L/session in the predilution HDF group and 51.5 ± 9.0 L/session in the mixed-HDF group was obtained by averaging values of three time-points. The difference in effective convection volume between the groups was 10.5 ± 1.3 L/session. This met the preset noninferiority criteria, suggesting that mixed-HDF was noninferior to predilution HDF. Moreover, the β2-microglobulin reduction rate was greater in the mixed-HDF group than in the predilution HDF group, while mixed-HDF provided greater transmembrane pressure. There were no significant between-group differences in Kt/V urea levels, changes in predialysis hs-CRP levels, proportions of overhydration, or blood pressure values. Symptomatic intradialytic hypotension episodes and other adverse events occurred similarly in the two groups. Conclusion: Use of mixed-HDF was comparable to predilution HDF in terms of delivered convection volume and clinical parameters. Moreover, mixed-HDF provided better β2-microglobulin clearance than predilution HDF.