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마산만 퇴적물의 중금속 및 유기염화합물 오염에 관한 연구
이찬원,민병윤,권영택,양운진,이규환 경남대학교 환경문제연구소 1990 환경연구 Vol.12 No.-
마산내만 및 마산만 유임 주요하천의 오염퇴적물을 1988년 7월부터 1989년 8월에 걸쳐 채취하여 중금속 및 유기염소화합물을 분석하였다. 오염퇴적충의 뚜께는 10㎝에서 169㎝의 넓은 분포를 보였으며 조사지점의 중금속농도는 지점에 따라 많은 차이를 나타내었다. 특히 인근에 마산수출자유지역 및 조선산업이 위치한 조사 지점에서는 모든 중금속의 농도가 가장 높게 나타났다. 마산만 퇴적오염물 중금속 농도를 오염된 일본의 자료와 비교하였을때 Osaka만의 수온을 제외하고 모든 평균농도가 높게 나타났다. 유기염소화합물(PCB 및 DDE)의 농도는 주거지역 및 공장지대가 함께 위치한 산호천 및 마산시 연안지역에서 높게 검출되었다. 본 연구결과에 의하면 마산만과 같은 폐쇄성 해역에서 중금속 오염원으로 공장폐수가 고려될때는 퇴적된 오염물질의 중금속 분석이 좋은 척도가 철 수 있음을 시사하고 있다. Sediments were collected from Masan bay and two main waterways into Masan Bay in the period of July 1988 to August 1989 for the analysis of heavy metals and Organochlorine compounds. The polluted layer of black sludge had a wide range between 10㎝ to 169㎝ and the content of heavy motels was widely distributed from site to site. One site near the Masan free-export area and a shipmaking company was extremely contaminated by heavy metals. All the average concentration of heavy metals in the sediments from Masan Bay were higher than those from Japanese bays compared except Hg from Osaka Bay. Higher levels of PCBs and DDE were found in sediments from Sanho stream and along the coastal area of Masan city. The results obtained in this study imply that the heavy metal analysis of sediments may be a useful to reveal the pollution sources in a closed bay fuck as Masan Bay.
막힘온도 지시계를 이용한 액체 나트륨중 불순물 농도 측정
권상운,정경채,김병호,김광락,황성태,최윤동,정지영 한국공업화학회 1998 응용화학 Vol.2 No.2
The monitoring of impurity in sodium is one of the most important R&D issues to develop a liquid metal reactor. Impurity measuring experiments were carried out by a Plugging Temperature Indicator, which is an on-line impurity monitoring instrument. Plugging temperature was successfully measured at various oxygen contents with two operation modes- bare orifice mode and partially plugging mode. The relation between plugging temperature and oxygen content was calibrated from the experimental data. Further study is needed to develop a more reliable instrument.
Byung Seok Moon,김상욱,Tae Sup Lee,Soon Hyuk Ahn,Kyo Chul Lee,Gwang Il An,Seung Dae Yang,DaeYoon Chi,Chang Woon Choi,Sang Moo Lim,Kwon Soo Chun* 대한화학회 2005 Bulletin of the Korean Chemical Society Vol.26 No.1
O-(3-[18F]Fluoropropyl)-L-tyrosine (L-[18F]FPT) was synthesized by nucleophilic radiofluorination followed by acidic hydrolysis of protective groups and evaluated with 9 L tumor bearing rat. L-[18F]FPT is an homologue of O-(2-[18F]fluoroethyl)-L-tyrosine (L-[18F]FET) which recently is studied as a tracer for tumor imaging using positron emission tomography (PET). [18F]FPT was directly prepared from the precursor of O-(3-ptoluenesulfonyloxypropyl)- N-(tert-butoxycarbonyl)-L-tyrosine methyl ester. FPT-PET image was obtained at 60 min in 9 L tumor bearing rats. The radiochemical yield of [18F]FPT was 40-45% (decay corrected) and the radiochemical purity was more than 95% after HPLC purification. The total time elapsed for the synthesis of [18F]FPT was 100 min from EOB (End-of-bombardment). A comparison of uptake studies between [18F]FPT and [18F]FET was performed. In biodistribution, [18F]FPT showed similar pattern with [18F]FET in various tissues, but [18F]FPT showed low uptake in brain. Furthermore, [18F]FPT showed higher tumor-to-brain ratio than [18F]FET. In conclusion, [18F]FPT seems to be more useful amino acid tracer than [18F]FET for brain tumors imaging with PET.
權炳善,朴又龍,鄭東熙,鄭東云,李乙台 順天大學校 農業科學硏究所 1996 農業科學硏究 Vol.10 No.-
The experiment was conducted to reduce the required time and production cost with the harvesting the garlic using the machine and the results are as follows. On labor saving effect in transparent vinyl mulching, digging working hours per 10a in the case of using tractor are 55 min, fixing + turning time is 11 min, the time of harvest is 66 min, digging working hours using cultivator are 90 min and fixing + turning time is 9 min, but the time of hand harvesting is 693 min. and 41 sec and in digging labor saving effect, tractor shows 90% in the harvesting period and harvest by cultivator 86%. On non mulching cases, the harvest by tractor takes 44 min and that by cultivator does 75 min, and digging required time saving effect shows 93% in the tractor harvest and 89% in the cultivator harvest. Therefore, on the working efficiency per hour, in the case of tractor with digger vinyl mulching and nonmulching show 0.091∼0.136㏊ and in the case of cultivator with digger both show 0.061∼0.08㏊, so in the mechanized harvest of garlic, the harvest by tractor with digger is the best. On the cost and time save of harvesting the garlic with labor saving effect, tractor shows 19 hours and 4 min/10a in vinyl mulching and 18 hours and 43 min/10a in nonmulching, so it shows the short hours for harvesting. And labor saving effect shows 30% in comparison with 25 hours and 43 min∼27 hours and 30 min (95,250∼102,375 won) of the hand harvest, so the cost was reduced to 69,111∼71,400 won. On the cultivator with diggers, vinyl mulching takes 20 hours and 12 min and nonmulching 19 hours and 6 min, so the labor saving effect and cost were reduced to 25∼26% (71,475∼75,450 won) in comparison with the manual harvest.
Kwon Jae-Woo,Kim Mi-Ae,Sim Da Woon,Lee Hwa Young,Rhee Chin Kook,Yang Min-Suk,심지수,김민혜,Kim So Ri,Park Chan Sun,Kim Byung-Keun,Kang Sung-Yoon,Choi Gil-Soon,Lee Hyun,Jang An-Soo,김상헌 대한천식알레르기학회 2022 Allergy, Asthma & Immunology Research Vol.14 No.3
Purpose: Oral corticosteroids (OCSs) are frequently prescribed for asthma management despite their adverse effects. An understanding of the pattern of OCS treatment is required to optimize asthma treatment and reduce OCS usage. This study evaluated the prescription patterns of OCSs in patients with asthma. Methods: This is a retrospective multicenter observational study. We enrolled adult (≥18 years) patients with asthma who had been followed up by asthma specialists in 13 university hospitals for ≥3 years. Lung function tests, the number of asthma exacerbations, and prescription data, including the days of supply and OCS dosage, were collected. The clinical characteristics of OCS-dependent and exacerbation-prone asthmatic patients were evaluated. Results: Of the 2,386 enrolled patients with asthma, 27.7% (n = 660) were OCS users (the median daily dose of OCS was 20 mg/day prednisolone equivalent to a median of 14 days/year). OCS users were more likely to be female, to be treated at higher asthma treatment steps, and to show poorer lung function and more frequent exacerbations in the previous year than non-OCS users. A total of 88.0% of OCS users were treated with OCS burst with a mean dose of 21.6 ± 10.2 mg per day prednisolone equivalent to 7.8 ± 3.2 days per event and 2.4 times per year. There were 2.1% (51/2,386) of patients with OCS-dependent asthma and 9.5% (227/2,386) with exacerbation-prone asthma. These asthma phenotypes were consistent over the 3 consecutive years in 47.1% of OCS-dependent asthmatic patients and 34.4% of exacerbation-prone asthmatic patients when assessed annually over the 3-year study period. Conclusions: We used real-world data from university hospitals in Korea to describe the OCS prescription patterns and relievers in asthma. Novel strategies are required to reduce the burden of OCS use in patients with asthma.
Fluorination of Metals and Metal Oxides by Gas-Solid Reaction
Kwon, Sang Woon,Kim, Eung Ho,Ahn, Byung Gil,Yoo, Jae Hyung,Ahn, Ho Geun 한국공업화학회 2002 Journal of Industrial and Engineering Chemistry Vol.8 No.5
The technology on the transmutation of nuclear waste has been developed to reduce the risks during the long-term storage of the long-lived radioactive nuclides. The fluorination of metals and metal oxides was studied to investigate the preparation of the fuel for a transmutation reactor. The solid reactants reacted with diluted hydrogen fluoride gas to produce fluorides in a monel tubular reactor. Ce0_2, Nd_20_3, and SrO were successfully fluorinated by the gas-solid reaction method. Noble metals did not react with hydrogen fluoride gas and could be separated from other elements during the dissolution step. Among the various gas-solid reaction models, the phase boundary controlled (reaction controlled) model was suitable for the fluorination of CeO_2, whereas the nucleation and growth model was suitable for Nd_20_3 and SrO. Reaction time required for the complete conversion could be predicted from the models.