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연속측정방법을 이용한 도심권 대기질 내 저농도 황화합물의 관측에 대한 연구
최여진,김기현,오상인,손장호 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.2
In this study, the concentrations of major reduced sulfur compounds (H₂S, CH₃SH, DMS, and DMDS) were determined from ambient air in a monitoring station located in the mid-eastern area of Seoul. Measurements of sulfur species were conducted by the combination of on-line air sampling, thermal desorption, and capillary GC/PFPD analysis. A total number of 143 hourly samples were collected in the two time periods set between June and July 2003. The mean concentrations of four sulfur species measured in the whole study period were found on the order: DMS (535±183H) > H₂S (47±10) > DMDS (35±22) > CH₃SH (6.19±29.4 pptv). The results of this study show that the concentrations of DMS at the study area are generally higher than those reported previously in the oceanic environments, while those of other sulfur species are not easy to compare with due to the lack of data. The H₂S concentrations were generally higher during the daytime than the nighttime, whereas those of others generally exhibited a reversed diurnal pattern. The overall results of our study suggest that the distribution of major reduced S compounds should be controlled by diverse processes in the urban area.
최여진,오상인,김기현 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.5
In the present work, the distribution characteristics of ambient volatile organic compounds (VOCs) were investigated at high temporal resolution from a monitoring station located in a mid-eastern area of Seoul. A total number of 587 samples were collected during December 2002 to January 2003. The measurements of VOC were conducted by a combination of on-line air sampling and thermal desorption unit (TDU) coupled with capillary GC/FID analysis. A total of five aromatic compounds (BTEX: benzene, toluene, ethyIbenzene, m, p-xylene, and o-xylene) were, measured routinely at hourly intervals during the whole study period. The mean concentrations of BTEX measured in our study period were found in the order: toluene (8.99±5.38ppb)>benzene(0.92±0.52ppb)>m, p-xylene (0.51±0.34ppb)>o-xylene(0.48±0.35ppb)>ethyl benzene (0.43±0.32ppb). The BTEX concentrations were generally higher during the daytime than the nighttime, exhibiting certain patterns on a weekly basis. Results of our analysis indicate that the unusually high concentrations of toluene, while showing good correlations with other VOCs, can be a good indicator of air pollution in the study area.
임부의 연령에 따른 보완대체요법에 관한 인식 태도 경험 비교 연구
김연진,김지연,노경민,신혜리,유예지,이지민,장희조,정아인,최소정,강숙정,이향연,민혜영 이화여자대학교 간호과학대학 2016 이화간호학회지 Vol.- No.50
Purpose: This study aims to test if the age of pregnant women affects the perception, experience, and attitude towards complementary alternative therapy (CAT), by investigating the perception, experience, and attitude of pregnant women under the age of 35, and above 35 (Advanced Maternal Age). The study will 1) find the general characteristics of pregnant women under and over the age of 35 2) compare the perception, behavior, and experience of pregnant women under and over the age of 35, and 3) find the comparison of the perception, behavior, and experience according to the general characteristics of pregnant women under and over the age of 35. Method: The subjects of this study are composed of 44 women under the age of 35 and 44 women above the age of 35, totaling 88 pregnant women visiting midwiferies, obstetrics and gynecology, and baby fairs in Seoul and Gyeong-Gi area. Data for this study was collected from November 28, 2015 to January 6, 2016 for 40 days. The collected data analyzed mean, standard deviation, t test, ANOVA, and chi-square by using SPSS 23.0. Result Results show that there is a significant difference in the perception, attitude, and experience of the two-sample groups in the use of CAT. The question of “what is most necessary when applying CAT in a hospital clinical environment” for the perception criteria came out with the results of t=9.980, p<.05. For the attitude, results showed that the answers of pregnant women under the age of 35 displayed a more positive attitude towards CAT. (t=2.421, p<.05) Lastly, in the experience section, pregnant women under the age of 35 showed more CAT use than the other sample group. Conclusion Results have shown that there is a difference in the perception, behavior, and experience between the two sample groups. Therefore further research on the efficacy and the adverse effects of CAT needs to be done.
다중 이용시설의 실내 공기 중 휘발성 유기화합물질(VOC)의 농도에 관한 연구
이기한,최여진,김기현 경희대학교 2003 環境硏究 論文集 Vol.12 No.-
As a means to investigate the status of indoo ollution Korea, we collected and analyzedmajor aromatic volatile compound (VOC) from diverse indoor facilities located all across Seoul city. The concentrations of major aromatic VOc inc uding benzene, toluene, ethylbenzene, xylene (commonly called, BTEX), and styrene were measured during the period covering Sept. through Nov. 2003. the results of our study generally indicated that the VOC levels in most indoor facilities are high enough to be distinguished from outdoor environments. Moreover, such pollution was generally dominated by significantly enhanced concentrations of toluene. Powever, it was found that relative dominance of VOC tend to vary greatly among different indoor conditions.
김기현,오상인,최여진,김민영,최규훈 한국대기환경학회 2003 한국대기환경학회지 Vol.19 No.4
In order to develop a confident sampling technique, we designed and constructed a 6-port manifold MFC sampling system for collecting gaseous pollutants in air. Using this instrumentation, we tested the performance criteria of MFC system in terms of: (1) flow rate; (2) MFC-to-MFC variability: (3) tube-to-tube variability: and (4) time. It was interesting to find that the later two factors did not show any significant variations, while the former two show substantially large variations. However, as most of those variabilities are consistent enough to form systematic patterns, we were able to explain the occurrence patterns of all those MFC biases in terms of those tour major variables. The overall results of our experiment suggest that one needs to use correction factor for each MFC unit under a given flow rate to maintain optimal accuracy and precision for sampling of those pollutants.
Rheological Behavior of Cold Water-Soluble Potato Starch Treated with Alcoholic-Alkaline
Ye-Jin Choi,Moo-Yeol Baik,Hyun-Seok Kim,Byung-Yong Kim 한국산업식품공학회 2016 학술대회 및 심포지엄 Vol.2016 No.10
The objective of this study was to determine rheological properties of cold water-soluble potato starch. Scanning Electron Microscopy (SEM) study showed that granule size of cold water-soluble potato starch was 10-60 μm, and shape was dimple in the middle, likely due to starch shrinkage after swelling during treatment. Cold water-soluble starch was prepared by ethanol (60%) and 3 M NaOH. The cold water solubility of native potato starch was low at 4.43±2.9%, whereas the solubility of cold water-soluble starch was high at 81.01±0.9%. The DSC diagram showed a gelatinization peak temperature of native starch but no such peak for treated starch. In dynamic tests, cold water-soluble starch showed decreased storage modulus (G') and loss modulus (G'') with increasing temperature, while native starch showed a continuous increase in G' and G''. This results indicated that cold water-soluble starch showed different granule structure and rheological properties.
Prevalence of Clostridium tetani isolated from cattle farms in Korea
Jin Sung Seo(Jin Sung Seo),Young Min Son(Young Min Son),Kwang-Ho Choi(Kwang-Ho Choi),Mi-Hye Hwang(Mi-Hye Hwang),Kichan Lee(Kichan Lee),Bang-Hun Hyun(Bang-Hun Hyun),Young-Ju Lee(Young-Ju Lee),Byeong Ye 한국예방수의학회 2018 한국예방수의학회 학술대회자료집 Vol.2018 No.-