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An Experimental Estimation of Two Detection Limit Models
마창진,강공언,수수무도노,미키오카사하라 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1
In environmental studies, decisions are often made on the analytical data indicating certain contaminants as being "detected" or "non-detectible." Since detection limits are analytical method specific, one has to first review the concepts and definitions associated with analytical method systems and specifications. In this study, the experimental analytical values for a series of low level standards (for an ionic species) were used as an example to estimate two different method detection limits (MDL). The scores of EPA's MOL and Pallesen's MDL determined by real analytical scores are 0.0575 and 0.0561 mg/L, respectively for our nitrate data. These scores determined by two different MDL models are roughly similar, while there are apparent differences between two methods with respect to statistical and systematical procedure. However, detennination of MDL for one's laboratory provides some practical applications which helps to assure one's regulating authorities that one's measured scores are accurate.
Characteristics of Gas- and Particle-phase Acids and NH₃at Urban and Rural Sites in Korea
마창진,김희강,강공언,수수무도노,미키오카사하라 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.E1
To study the characteristics of ammonia and the related compounds, atmospheric aerosols and gases were collected using a triple filter pack sampler, a low volume air sampler, and a three-stage Andersen air sampler in Seoul and Kangwha Island, Korea from Dec. 1996 to Oct. 1997. Ammonia concentrations showed approximately two times higher in summer than in winter at both sites. The highest HNO₃ levels were generally observed in summertime at two sampling sites. The average mass concentration of PM_2.5 in heavily industrialized Seoul was about three times higher than that of Kangwha. In winter, the sum of NH₄^+ and its counter ions (such as CI^-, NO₃^-, and S0₄²^-) comprised 30-41% of PM_2.5 mass concentration at each sampling site. Temperature dependence of particulate nitrate was examined at the urban sampling site. The formation of the nitrate in the fine mode was dependent not only on the amount of precursors but also on the variation of temperature. (NH₄)S0₄and NH₄HS0₄coexisted with NH₄NO₃and NH₄Cl at each site. According to the summertime backward trajectory analysis. NO₃- showed higher level with air parcels transported from northeast Asian continent. On the other hand, the concentration of SO₄²- showed significantly higher level when air masses originated from Pacific Ocean, southern part of Japan. and Korea.
Present situation of English education in Japan
미키오 나모토,마사요시 키노시타,치유키 타쿠보,카츠미 키요나가,메구미 카와지리,츠요시 카나모리 팬코리아영어교육학회 2000 영어교육연구 Vol.12 No.1
At present English Education in Japan is conducted at the secondary level only.
야마노이 미키오(Mikio Yamanoi),곽태수(Tae-Soo Kwak),정종교(Jong-Kyo Jung) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.3
This study is focused on simulation technology in injection molding process for plastic optic lenses. The CAE program, 3D-TIMON<SUP>TM</SUP> is used for the injection molding simulation with O-PET resin material. The design for different gate shape and runner layout has been under review by CAE simulation results. Moreover, the prediction of birefringence and polarized light in injection molded optic lenses has been tested by the CAE Program. The simulation results have been expected to effectively use in the design of injection molding mould.
최금찬,전기일,미키오, 카사하라 동아대학교 환경문제연구소 1990 硏究報告 Vol.13 No.1
Dry and wet deposition were considered for aerosol particles. In wet deposition, aerosol particles are become nuclei to make cloud particles, the generated cloud paticles are removed by settling as rainfalls. Also, gases are absorbed in cloud particles and rainfalls in the atmosphere. In dry deposition, deposition rate is largely depends on the deposited surface areas and its properties. Some dispersion models are able to apply to obtain good results for dry and wet deposition.