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RISS 인기검색어
- 검색키워드
- 저자 : 우대광(Daekwang Woo) (검색결과 5 건)
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우대광(Daekwang Woo),남경탁(Kyungtag Nam),김영길(Younggil Kim),김광수(Kwangsu Kim),강윤호(Yunho Kang),김태성(Taesung Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The particle formation using pyrolysis has many advantages over other particle manufacturing techniques. The particles by pyrolysis have relatively uniform size and chemical composition. Also, we can easily produce high purity particles. Thus, we studied the formation of silicon particles by pyrolysis of 50% SiH₄ gas diluted in Ar gas. A pyrolysis furnace was used for the thermal decomposition of SiH4 gas at 800℃ and atmospheric pressure. The aerosol flow from furnace is separated into two ways. The one is to the Scanning Mobility Particle Sizer (SMPS) for particle size distribution measurement and the other is to the particle deposition system. The produced silicon particles are deposited on the wafer in the deposition chamber. SEM measurement was used to compare the particle size distribution results from the SMPS. Depending on the experimental conditions, particles of high concentration in the 30~80 ㎚ size range were generated.
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도로변 측정을 이용한 2행정 스쿠터의 대기오염물질 배출특성 연구
우대광(Daekwang Woo),이승복(Seung-Bok Lee),배귀남(Gwi-Nam Bae),임철수(Cheolsoo Lim),김태성(Taesung Kim) 한국대기환경학회 2011 한국대기환경학회지 Vol.27 No.6
Although a scooter is a convenient transportation means for a short distance traveling with a light package in the congested urban center, it might be one of the significant sources of air pollutants to which many people can easily be exposed during its passing-by. In this paper, we measured concentrations of gases and particles emitted from a scooter at roadside with no other traffic. To understand the characteristics of scooter emissions with respect to driving speed (idling, 30 ㎞/h) at the roadside, total particle number concentration, particle size distribution, average surface area of particles deposited in the alveolar region, and concentrations of black carbon, CO, and NO<SUB>x</SUB> were measured. The concentrations of the particle number, surface area of deposited particles, CO, and NO<SUB>x</SUB> were highly fluctuated in the scooter’s idling condition. The trends of particle number concentration, CO, and NO<SUB>x</SUB> generation were similar to one another. When the scooter started to move, all of NO<SUB>x</SUB>, CO and particle number concentrations increased and after it passed by at the speed of 30 ㎞/h, the concentration peaks of the particles and gases appeared at the same time. Unimodal size distribution with ~70 and ~93 ㎚ mode diameters was observed for the idling and cruising condition, respectively. From this work, we found that emission from a passing vehicle could be characterized using a roadside monitoring technique.
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겨울철 서울 내부순환로 도로상 초미세입자 오염의 공간분포 특징
우대광(Daekwang Woo),이승복(Seung-Bok Lee),이승재(Seung Jae Lee),김진영(Jin Young Kim),진현철(Hyun Chul Jin),김태성(Taesung Kim),배귀남(Gwi-Nam Bae) 한국대기환경학회 2013 한국대기환경학회지 Vol.29 No.1
To understand the traffic emissions with high temporal and spatial resolutions on road, a mobile laboratory was developed. The objective of this study is to characterize on-road air pollution on Naebu express way surrounding the northern area of Seoul, Korea. We measured the number concentration of ultrafine particles larger than 5 nm and particle size distribution using a condensation particle counter and a fast mobility particle sizer, respectively on 3, 7, and 8 December 2009. The average ultrafine particle number concentration on the Naebu express way excluding tunnels was 126,000 particles/㎤ and 4.2 times higher than that on internal road at Korea Institute of Science and Technology in Seoul, and more than twice higher than that measured on and at the arterial roads of Seoul in previous studies. The maximum ultrafine particle number concentration was observed at the tunnel sections. It was 232,000 particles/cm3 and 1.8 times higher than average ultrafine particle number concentration for the other sections on Naebu express way. The ultrafine particle number concentration on the wider roads with higher traffic volume along the Han River was similar to that in the residential section, probably because of enhanced dilution effect in widely open environment. The size distribution of particles on the Naebu express way was highly fluctuated for a short duration. Ultrafine particles measured at the tunnel showed a bimodal size distribution with mode diameters of ~10 nm and ~50 nm. At the Han riverside section, ~10 nm particles appeared significantly compared with size distribution at the tunnel. This on-road measurement approach can be utilized to manage vehicle-related air pollution in urban area.
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SMPS와 TR-DMPS를 이용한 도로변 초미세 입자 모니터링 결과의 비교
우대광(Daekwang Woo),이승복(Seung-Bok Lee),배귀남(Gwi-Nam Bae),김태성(Taesung Kim) 한국대기환경학회 2008 한국대기환경학회지 Vol.24 No.4
A Transient Differential Mobility Particle Spectrometer (TR-DMPS) with a short response time was recently developed to monitor high concentration of ultrafine particles emitted from vehicles. To investigate the availability of the TR-DMPS for monitoring transient roadside aerosols, the number size distribution of ultrafine particles was monitored at the Cheongnyangni roadside in Seoul on March 23, 2007 together with a Scanning Mobility Particle Sizer (SMPS). The roadside aerosols were monitored every 5 min and 0.1 sec by using the SMPS and the TRDMPS, respectively. The concentration of ultrafine particles at the roadside was highly fluctuated for a short duration. From the comparison of particle number concentrations and size distributions between two instruments, it was confirmed that the SMPS provided fairly good time-averaged number size distribution although it did not follow rapid change of particle number concentration at the roadside. The TR-DMPS quickly responded to a rapid change of particle number concentration due to abrupt traffic flow. However, the TR-DMPS frequently showed electrical noise events, resulting in underestimated particle contamination. A more stable operation of the TR-DMPS is needed in application of roadside aerosol monitoring.
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