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Characteristic of Hyperfine Magnesioferrite Particles Possessing Shape Anisotropy
Yim, Going,Yim, Chai-Suck 배재대학교 공학연구소 2005 공학논문집 Vol.7 No.1
The ferrimagnetic resonance technique, with the inclusion of shape anisotropy effects, was used to obtain information about the early stages in the precipitation of magnesium ferrite from iron-doped magnesia. The very small magnesioferrite particles were produced by precipitation method from solid solution of iron ion in single crystal magnesia. The temperature dependence of the resonance anisotropy field for a coherent assembly of hyperfine magnesium ferrite precipitates was investigated in the range 100~400K. The results are interpreted in terms of the shape anisotropy of the precipitates.
Evaluation of an Ammonia Passive Sampler Using Chamber System
Yim, Bong-Been,Kim, Sun-Tae Korean Society for Atmospheric Environment 2006 한국대기환경학회지 Vol.22 No.E1
The purpose of this study was to evaluate the efficiency of a passive sampler in measuring atmospheric ammonia concentrations using chamber system. The ability of the passive sampler to quantitatively determine atmospheric ammonia gas was almost identical to that of the reference method (indophenol method). There was no significant difference between concentrations measured by the two methods. The detection and quantification limits of the ammonia passive sampler were 16.9 ppb and 25.3 ppb, respectively, for a 24-h sampling period. The average coefficient of variation between replicated samplers was $6.7{\pm}4.2%$. The concentrations measured by the two methods (passive sampler and indophenol method) were no significant difference with good a correlation (correlation coefficient=0.964).
Evaluation of Badge-Type Diffusive Sampler Performance for Measuring Indoor Formaldehyde
Bong Been Yim,Kyu Sung Lee,Joo In Kim,Hyun Su Hong,Sun Tae Kim 대한환경공학회 2013 Environmental Engineering Research Vol.18 No.3
The purposes of this study were to determine the efficiency of using a badge-type diffusive sampler to measure formaldehyde concentrations indoors, and to evaluate the uncertainty associated with the use of data from a diffusive sampler. A diffusive sampler using 2,4-dinitrophenylhydrazine (DNPH) reagent was found to be a suitable tool for measuring the formaldehyde concentration in an indoor environment. The agreement between results of the diffusive sampler and DNPH cartridge were good, showing a correlation coefficient of 0.996. The sampling rate for the diffusive sampler was calculated to be 1.428 L hr.1, with a standard deviation of 0.084 L hr.1. It was found through analysis that the uncertainty associated with the sampling rate and the mass of the formaldehyde transported into the diffusive sampler by diffusion was the dominant contributor to the total.
Volatile Organic Compounds Measurement In The Boundary Of Waste Treatment Facilities
Bong Been Yim,Sun Tae Kim 대한환경공학회 2007 Environmental Engineering Research Vol.12 No.2
Concentrations of the principal volatile organic compounds, such as benzene, toluene, ethylbenzene, m,p,o-xylene, styrene, and chlorobenzene were measured at the solid waste treatment plants classified into four categories; municipal waste incinerator, municipal waste landfill site, industrial waste incinerator and industrial waste landfill site. The average concentration of VOCs in industrial waste treatment facilities was 33.43 ppb and was significantly higher than that measured at municipal waste treatment facilities (4.71 ppb). The average toluene concentrations measured at incinerators (13.05 ppb) were a little higher than those measured at landfill sites (11.54 ppb). The contribution of the waste treatment facilities to the concentration of benzene (0.35 ppb) and o-xylene (0.15 ppb) in the industrial area was relatively small. However, toluene measured in the industrial waste treatment facilities was the most abundant VOCs with the average concentration of 21.37 ppb. As a result of analyses of fingerprint, in cases of IISH and ILUS, a variety of compounds other than major VOCs were detected in high level. On the Pearson correlation analysis, the correlation was generally positive and some pairs of these VOCs were very strongly correlated (correlation coefficient > 0.75).
폐수의 악취측정을 위한 금속산화물 반도체 및 전기화학식 가스센서 어레이 특성 평가
임봉빈 ( Bong Been Yim ),이석준 ( Seok Jun Lee ),김선태 ( Sun Tae Kim ) 한국센서학회 2015 센서학회지 Vol.24 No.1
This study aimed to evaluate the characterization of a metal oxide semiconductor and electrochemical gas sensor array for measuring wastewater odor. The sensitivity of all gas sensors observed in sampling method by stripping was 6.7 to 20.6 times higher than that by no stripping, except sensor D (electrochemical gas sensor). The average reduction ratio of sensor signal as a function of initial dilution rate of wastewater was in the order of food plant > food waste reutilization facility > plating plant. The sensitivity of gas sensors was dependent on both the type of wastewater and the dilution rate. The sensor signals observed by the gas sensor array were correlated with the dilution factor (OU) calculated by the air dilution sensory test with several wastewater (r2=0.920~0.997), except the sensor signals of sensor D measured in the plating plant wastewater. It seems likely that the gas sensor array plays a role in the evaluation of odor in wastewater and is useful tool for on-site odor monitoring in the wastewater facilities.
임성빈(Seoung Been Yim),김미숙(Misook Kim),김은경(Eun-Kyung Kim),고재윤(Jae Youn Ko),정윤화(Yoonhwa Jeong) 한국식품영양과학회 2010 한국식품영양과학회지 Vol.39 No.12
본 연구에서는 타우린 첨가 김치의 발효과정 중 화학적 특성의 변화를 조사하였다. 대조군, Taurine I, Taurine Ⅱ 및 Taurine Ⅲ의 환원당과 비타민 C 함량은 발효 46일 후에 0일째와 비교하여 감소하였다. 대조군에서 타우린은 검출되지 않았으며, 타우린군의 경우 타우린 함량은 타우린첨가량에 비례하였고 발효기간 동안 타우린 함량은 크게 변하지 않았다. 이러한 결과로부터 첨가한 타우린이 김치 발효 숙성중에 영향을 받지 않음을 알 수 있었다. 아미노태 질소 함량은 Taurine Ⅲ> Taurine Ⅱ> Taurine I> 대조군의 순이었다. 모든 분석 항목에서 타우린 첨가가 저온에서의 김치 발효에 영향을 미치지 않은 것으로 사료된다. The present study was carried out to elucidate the changes in the chemical characteristics of taurine added Kimchi during fermentation for 46 days at 6oC. Chinese cabbage was brined in a 10% salt solution for the control Kimchi and in a 10% salt solution containing 5% taurine for taurine added Kimchi (Taurine I, Ⅱ, and Ⅲ). One and three percent (w/w, based on Chinese cabbage) of taurine were added to make Taurine Ⅱ and Taurine III, respectively. Reducing sugar and vitamin C contents for all the samples decreased after the 46-day fermentation. Taurine was not detected in the control, and the taurine contents, from the largest to the smallest, during the fermentation period were Taurine Ⅲ, Taurine II and Taurine I. Amino nitrogen contents in all the samples studied proportionally increased during the 46-day fermentation. It is suggested that taurine does not affect the chemical characteristics of Kimchi during fermentation at low temperature (6℃).