• Journal of Korean Society for Atmospheric Environment
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• v.3 no.2
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• pp.39-45
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• 1987

Rubber particles emitted from automobile tire tread by abrasion were collected by Andersen sampler with atmospheric dusts. The samples of atmospheric dusts at each stage were analysed for rubber particles by Curie point pyrolysis-gas chromatography with Apiezon grease L column. Pyrolysis was done at 740$^circ$C for 5 seconds. In the pyrogram, NR rubber (bus and truck tire tread) was determined by isoprene peak, and SBR rubber (passenger car tire tread) was determined by styrene peak simultaneously. The size distribution of rubber particles was proportioned with the size of rubber particles. The concentrations of NR and SBR rubber were 0.23 $\mug/m^3$ and 1.31 $\mug/m^3$, respectively, in the atmospheric dusts which were collected from the street in front of Yonsei University on April 1986. The ratio of tire tread rubber in the atmospheric dusts was about 0.63%.

• Journal of Korean Society for Atmospheric Environment
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• v.15 no.1
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• pp.13-22
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• 1999

This study is carried out to investigate the chemical composition of atmospheric deposition in Cheju Island, Korea. For this purpose, dustfall matter samples are collected by dust jar from August, 1995 to July, 1996 at five sampling sites and total suspended particulate matters (TSP) and rain are also collected at one site from October, 1995 to July, 1996. All the samples collected are analyzed, and then the information of the 19 chemical species and deposition amount of each species is obtained. These data are used to determine the regional trends in dustfall chemistry and deposition, and compare the characteristics of chemical compositions between dustfall, TSP and rainwater.

• Journal of Korean Society on Water Environment
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• v.26 no.3
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• pp.525-531
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• 2010

To figure out the importance of temperature on electrochemical properties in water environment, calcium carbonate, one of important substances in water chemistry, was chosen to make suspensions. The result of electrokinetic potential of calcium carbonate suspensions revealed that it tended to increase as temperature increased. In addition, electrokinetic potential was negatively increased as suspensions became more basic. Its isoelectric point was ca. 7 regardless of temperature. The adsorption of hydrogen ions on calcium carbonate particles followed endothermic reaction. This result was verified by continuously measuring pH as adding HCl solution in calcium carbonate suspension. It explained that suspensions' potential was determined by DLVO theory which calculated total interaction energy between particles. Suspensions' total interaction energy was proportional to the value of electrokinetic potential. Furthermore, total interaction energy between particles increased as suspensions' temperature was increased.

• Transactions of the Korean Society of Machine Tool Engineers
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• v.12 no.6
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• pp.104-111
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• 2003

In order to collect the engine performance data and determine optimum engine conditions, engine performance test based on interface unit were tested This paper was carried out that engine' performance was developed using interface unit between personal computer and diesel engine. The results of the study are summarized as follows: Interface unit was developed. By using PAL, simulation was carried in order to logic's inspection. From this tea NO$_{x}$ were decreased, otherwise PM were increased. By using EGR system PM were increased by twice in the high load ranges, it was not seen to come into effect in the low load ranges. This system was tested D-l3 mode, the results were decreased more than 50% in the NO$_{x}$ emission.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.77-82
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• 2005

Recently, people's rising interests toward a 'well-being' lifestyle together with research contributions are accelerating the concerns regarding indoor air pollution making indoor air quality management an emerging environmental challenge of the era. The Ministry of Environment began to regulate the air quality of railway stations last year. The newly established 'Indoor Air Quality Act' covers 17 facilities whereas only underground subway stations and underground markets were regulated by previous 'Underground Air Quality Management Act' of 1996. In this study, we carried out the measurement of temperature, relative humidity, CO(carbon monooxide), $CO_2$(carbon dioxide), HCHO(formaldehyde), PM-10(particulate matters), and VOCs(volatile organic compounds) in underground subway stations. Based on the obtained results, we will suggest a way to improve the indoor air quality of the subway stations.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.1558-1563
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• 2007

The air pollution by the diesel locomotives has become serious environmental concern because the emission gases are exhausted without any further treatment. Recently, the public interest on the air pollutants emission reduction technology is increasing due to the establishment of 'Metropolitan Air Quality Preservative Law' and the regulation of local governments on the urban air quality. In this study, we measured the concentration of particulate matters and gaseous pollutants by using a scanning mobility particle sizer, a dust spectrometer, and a stack sampler upon various engine load condition. The results show that the amount of emitted air pollutants increased upon the increase of engine power. The development of new technology to reduce the air pollutants emission is urgently required.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.989-993
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• 2007

It was intended in this study to seek for the measures to utilize the USN technique, which has high usability due to low price and low power consumption, in air quality monitoring. As a method, the sensors of temperature, humidity, particulate matters (PM10), and carbon dioxide ($CO_2$) were installed in the self-manufactured sensor nodes; the nodes were installed in the waiting rooms and platforms of a subway station and the measurements were collected at real time with use of a computer which micro gateway was built in. Collected data was to be processed by the statistics program installed in the computer; the collected data is to be used in managing the air quality of stations after transmission to the ventilation system of ventilation chambers.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.209-210
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• 2003

국제 표준화 연구와 관련하여, 측정 및 분석과 관련된 국제기관들이 참여하여 1993년에 발행된 측정 불확도의 표현지침인 GUM은 데이터의 품질 관리 및 보증의 수단으로서 활발히 연구되고 있다. 특히, 국제적으로도 CCQM, CITAC, Eurachem, NIST 등의 기관을 중심으로 GUM 규격의 적용이 활발히 연구되고 있으나, 미국보다는 유럽에서 데이터 품질의 계량화 기술로서 연구되고 있다. 한편, 유해 대기오염물질인 중금속측정 자료가 국내에 축적되고 있음에도 불구하고 이러한 물질에 대한 측정 불확도가 거의 평가된 적이 없어 분석 값에 대한 보증을 위해 행하는 일련의 과정에 대한 표준 절차서가 시급한 현실이다.(중략)

• Proceedings of the Korean Society of Marine Engineers Conference
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• 2012.06a
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• pp.125-126
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• 2012

The key issues for the reduction technologies of the exhaust gas from diesel engine being developed are to reduce particulate matters and NOx. Performance of NOx removal in SCR process depends on such various factors as catalyst factors(catalyst composition, shape, velocity, etc.), exhaust gas temperature and velocity distribution. In this study checked flow uniformity with the flow characteristics in the SCR reactor by using STAR CCM+. The pressure drop of experiment and simulation had similar result more than 90% at catalytic Cell. Also, flow uniformity calculated about 0.9036 ant 1st catalytic ind SCR reactor.

• Journal of Korean Society for Atmospheric Environment
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• v.12 no.1
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• pp.67-77
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• 1996

Total suspended particulate matters (TSP) were collected based on a size segregation method by a cascade impactor for 6 consecutive years (form Dec. 1989 to sep. 1994) in the Kyung Hee University-Suwon Campus, and 6 trace metals (Ca, Si, Fe, Pb, Cu, Zn) were determined by an x-ray fluorescence spectroscopy. Total number of samples collected during the study are 118 sets and each set of sample comsists of 9 filters. The levels of TSP and 6 trace metals were then used to examine seasonal and annual variations with respects to their size distributions. For statistical analyses, raw data were initially transformed by both logarithmic and root transformating to approximately normalize them, and then size distribution functions for each trace element were separately developed season-to-season by a regression analysis in order to obtain maximum amount of physical information, Subsequently, each developed model was verified by comparing with supervised data collected on 1994. The result showed that each prediction model was in good agreement except the fall, partly due to lack of the data collected on fall, 1994.