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스캐너를 이용한 AZ31 극박판재와 AZ91D 다이캐스팅 프레임의 고속레이저용접
이목영,서민홍,Lee, Mok-Young,Seo, Min-Hong 한국레이저가공학회 2015 한국레이저가공학회지 Vol.18 No.1
High welding speed and narrow weld seam are favorable for welding of magnesium alloy. Magnesium alloy is recommended for the smart frame because it has several advantages such as low density, high thermal conductivity, EMI shielding capability and good cast ability. This study is for the assembly welding of the magnesium smart frame with high productivity, good performance and low cost. The window for battery on AZ91D frame produced by die-casting was prepared by CNC machining. Corresponding AZ31 blank of 0.2mm thickness was prepared by die-blanking cut. All system set was fixed at the stationary bed but the laser beam was manipulated by scanner up-to 1,000mm/s speed. The weld joint between AZ31 sheet and AZ91D frame was welded by fiber laser on 850~1,000W output power. The joint showed penetration enough but some humping bead. The distortion by the weld heat was almost free because of the quick dissipation of the heat by small beam size and fast welding. Consequently, the thinner magnesium foil was assembled successfully to the magnesium frame of mobile phone.
우리나라 먹는물의 크립토스포리디움에 의한 건강위해도 평가 연구
이목영,박상정,조은주,박수정,한선희,권오상,Lee, Mok-Young,Park, Sang-Jung,Cho, Eun-Joo,Park, Su-Jeong,Han, Sun-Hee,Kwon, Oh-Sang 한국환경보건학회 2013 한국환경보건학회지 Vol.39 No.1
Objectives: Cryptosporidium, a protozoan parasite, has been recognized as a frequent cause of waterborne disease due to its extremely strong resistance against chlorine disinfection. Although there has as yet been no report of a Cryptosporidium outbreak through drinking water in Korea, it is important to estimate the health risk of Cryptosporidium in water supply systems because of the various infection cases in human and domestic animals and frequent detection reports on their oocysts in water environments. Methods: This study evaluated the annual infection risk of Cryptosporidium in tap water using the quantitative microbial risk assessment technique. Exposure assessment was performed upon the results of a national survey on Cryptosporidium on the water sources of 97 large-scale water purification plants in Korea, water treatment efficacy, and daily unboiled tap water consumption. The estimates of the US Environmental Protection Agency on the mean likelihood of infection from ingesting one oocyst were applied for effect assessment. Results: Using probabilistic methods, mean annual infection risk of Cryptosporidiosis by the intake of tap water was estimated to fall within the range of $2.3{\times}10^{-4}$ to $1.0{\times}10^{-3}$ (median $5.7{\times}10^{-4}$). The risk in using river sources was predicted to be four times higher than with lake sources. With 0.5-log higher removal efficacy, the risk was estimated to be $1.8{\times}10^{-4}$, and could then be lowered by one-third. Conclusions: These estimations can be compared with acceptable risk and then used to determine the adequacy and priority of various drinking water quality strategies such as the establishment of new treatment technology.
1623 방법에 의한 서울시 상수도계통의 지아디아 및 크립토스포리디움 검출
이목영(Mok Young Lee),김도연(Do Yeon Kim),조은주(Eun Ju Cho),이의광(Eu Kwang Lee),오세종(Sea Jong Oh),이채근(Chae Keun Lee),하영칠(Yung Chil Hah) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.5
Giardia cysts and Cryptosporidium oocysts in water samples were detected simultaneouly using 1623 Method, which combined capsule/membrane filtration and immunomagnetic separation with immunofluorescence assay. In this study, raw water samples from 6 intakes, finished and tap water samples supplied from Kueui Water Treatment Plants in Seoul, and Wangsuk creek water samples were tested from April 1999 to February 2000, to estimate the prevalence of two protozoa in Seoul drinking water supplies. Giardia cysts were found in 25∼75% of water samples from 6 intakes in the range of 0∼9.7/10L. Cryptosporidium oocysts were found in 0∼50% of six intake water samples in the range of 0∼4/10L. Raw water samples from Kueui. Jayang, Pungnap intakes showed significantly higher concentration and more frequent incidence of Giardia than that from Paldang, Kangbuk. Amsa intakes. It seemed that Wangsuk creek acts as an important source of Giardia pollution in Kueui, Jayang. Pungnap intakes because all samples from Wangsuk creek, flowing in upstream of Kueui intakes, contained 19∼109/l0L of Giardia cysts. No Cryptosporidium and Giardia were found in all finished and tap water sample. We concluded that Giardia cysts are more often found in raw surface waters of Seoul than Cryptosporidium oocysts, although two protozoa were not detected in treated water samples of Kueui Water Treatment Plant.