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한상만,박한석,변기식 釜慶大學校 1998 釜慶大學校 論文集 Vol.3 No.2
Local heating transportation pipe has sensor and return lines to detect water- leakage. There are impulse and resistance comparison measurementtypes for a water-leakage detection. The impulse type shows large detection error within a measurement range. Since the resistance comparison type can find a comparative accurate single water-leakage point in the measurement range of heating pipe. it has used to detect water-leakages these days. However if the multi water-leakages are happened in the measurement range of trange of transportation pipe. the resistance comparison type shows a detection error point by the parallel resistance between a detection sensor line and ground. But the detection error will be minimized by the divided transportation pipe loops. In this research, it suggests the design of remote controlled detector which can divide a large pipe loop and a possible single water-leakage measurement process in each divided loops.
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정석문,김정한,김동열,육홍선,변명우,이승철 慶南大學校 附設 基礎科學硏究所 2002 硏究論文集 Vol.16 No.-
왕겨에 200, 400, 600, 800 및 1000 Gy의 저선량의 감마선을 조사하여 항산화능의 변화를 관찰하였다. 총 페놀 화합물의 양은 무처리구의 경우 0.184 mM를 나타내었고, 200 Gy로 감마선을 조사하였을 때는 0.215 mM로 약간 증가함을 보였으나 이후 차츰 감소하였다. 전자 공여능은 무처리구에 비해 처리구의 경우 조사 선량별로 조금씩의 차이만 있을 뿐, 조사 선량에 대한 왕겨의 전자 공여능은 유의적인 큰 변화 없이 비슷한 활성을 보였다. Fe^2+-ions 킬레이팅 활성은 무처리구의 경우 68.25%를 나타내었으며, 200, 400, 600 및 800 Cy 에서는 각각 86.45, 85.61, 86.65 및 82.84%로서 무처리구보다는 증가함을 보였으나, 1000 Gy에서는 74.67%로 감소하였다. 지질 과산화 억제능은 무처리구에 비해 처리구는 약간의 증가를 보였으나 효과는 미비하였다. We studied the effect of small-dose of γ-irradiation to rice hull(RH) for its antioxidant ability. The RH was treated with 200, 400, 600, 800, and 1000 Gy of γ-ray at 70 Gy/min. Total phenol amount of unirradiated RH was 0,184 mM, after irradiation at 200 Gy it increased to 0,215 mM, while irradiation above 400 Gy up to 1000 Gy decreased that to unirradiated level. The electron donating ability of RH did not show significant change depend on irradiation. The chelating ability for Fe^2+ of unirradiated RH was 68.25 %, while that of 200, 400, 600 and 800 Gy irradiated RH showed 86.45, 85.61, 86.65 and 82.84 % respectively, but, 1000 Gy was decreased to 74.67 %. According to TBARS analyses, inhibition ability of lipid peroxidation by RH was not affected by γ-irradiation.
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변종철,한충훈,이남호,백종석 濟州大學校 基礎科學硏究所 2001 基礎科學硏究 Vol.14 No.2
diamine류 { ethylenediamine, 1,3-propanediamine, 2,2-dimethyl-1,3-propanediarnine, o-phenyle-nediamine}와 aldehydes { salicylaldehyde, 5-chlorosalicylaldehyde, 3,5-dichloro- salicylaldehyde, 3,5-di-tert-butyl-2-hydroxybenzaldehyde}를 methanol#액에서 축합반응시켜 네 자리 salen형 리간드(H₂L_(acn);n=1-11)를 합성하였다. 이들 리간드의 toluene(또는 methanol) 용액에 Mn(OAc)₂·4H₂O methanol용액을 첨가하고, 공기를 주입시켜[Mn(L_(acn))Cl] 착물을 얻었다. 이들 리간드 및 착물들은 원소분석, 전도도 및 NMR, IR, UV-VIS 분광학법을 이용하여 확인·고찰하였다. A series of tetradentate salen-type ligands(L_(ac)) were been prepared by condensation of diamines { ethylenediamine, 1,3-propanediamine, 2,2-dimethyl-1,3-propanediamine, and o-phenylenediamine} and aldehydes {salicylaldehyde, 5-chlorosalicylaldehyde, 3,5-di-chlorosalicylaldehyde, and 3,5-di-tert-butyl-2-hydroxybenzaldehyde} in methanol. These [Mn(L_(ac))Cl] complexes were synthesized from the reaction of toluene(or methanol) of L_(ac) with methanol solution of Mn(OAc)₂·4H₂O in the presence of air. These ligands and complexes were characterized and confirmed by elemental analysis, conductivity, NMR, IR, and UV-VIS spectroscopy.
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Validity assessment of self-reported smoking status in firefighters using the urine cotinine test
Han Cheol Heo,Young Seok Byun,Soo Ho Sohn,Seong Min Jo,Sung Kyu Park,Joon Sakong 대한직업환경의학회 2020 대한직업환경의학회지 Vol.32 No.-
Background: In firefighters, smoking management is important because they are exposed to various harmful substances in their occupational environment. Accurate surveys of smoking status are essential to control tobacco use. The main disadvantage of self-report questionnaires, which are commonly used for investigating smoking status, is the possibility that the subjects" response are invalid. If the validity of firefighters" answers on smoking questionnaires is not adequate, different methods will be needed for investigating smoking status in firefighters. Methods: This study was conducted on 445 male firefighters from 9 fire stations in Daegu (the city in South Korea) who visited a medical institution for medical checkup in 2016. The urine cotinine test strip (DCT-102; CLIAwaived Inc., cut-off value = 200 ng/mL) was used to classify the actual smoking status and to assess the validity of self-reported smoking status on questionnaires. The sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of the smoking questionnaires were analyzed. Subjects testing positive in the urine cotinine test (assumed the actual current smokers) were selected. The frequency at which actual current smokers were misclassified as current non-smokers by the questionnaire was calculated. Subjects" characteristics were analyzed for possible association with any discrepancy between self-reported smoking status and urine cotinine test results. Results: The smoking rates among firefighters surveyed using the smoking questionnaire and the urine cotinine test were 22.47% and 51.24%, respectively. Of the all subjects, 29.66% (n = 132) were misclassified. The sensitivity of the smoking questionnaire was 42.98%, the specificity was 99.08%, the PPV was 98.00%, and the NPV was 62.32%. In the 228 subjects classified as current actual smokers by the urine cotinine test, 57.02% (n = 130) were misclassified on the questionnaire. The misclassification rate increased with age. The degree of misclassification also increased when subjects had a history of disease. Conclusions: In present study, the validity of the smoking questionnaire for firefighters was not suitable for investigating smoking status due to low sensitivity. To increase the validity of smoking status monitoring in firefighters, consideration of the various factors like survey environment, subjects" characteristics, and occupational factors is needed.
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한동석,신원한,최순관,변박장,이인수,이동화 대한신경외과학회 1988 Journal of Korean neurosurgical society Vol.17 No.4
The posterior fossa arterivenous malformation(AVM) is uncommon and different from other intracranial AVM in its natural history, diagnosis, treatment, prognosis, and other features. The authors present 3 cases of posterior fossa AVM. A 26 year old woman with supravermian AVM and a 17 year old woman with right cerebrllopontine angle AVM were treated with surgical removal in good result. And another was occured in the pons of 20 year old woman, that was treated with intersecting beam radiation of 5040 rads in cummulative dosage.
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마늘 抽出物이 Lard와 Alcohol을 攝取한 흰쥐 血淸중의 脂質成分 및 醱酵活性에 미치는 影響
韓相今,卞富亨,金漢洙,金碩煥 東亞大學校附設基礎科學硏究所 1987 基礎科學硏究論文集 Vol.4 No.1
脂質代謝에 미치는 成分의 영향을 檢討하기 위해서 흰쥐에 lard와 alcohol 및 마늘을 첨가한 食餌를 10週間 給與하여 成長시킨 後 體重, 各種 臟器 重量, 血淸脂肪成分 含量 및 AST, ALT, ALP, LDH의 活性을 測定하였을 때 다음과 같은 結果를 얻었다. 1. lard와 alcohol 첨가식이群에서는 體重과 食餌攝取量은 감소하였으나 마늘의 投與에 依한 食餌效率은 增加하였다. 2. lard의 添加 食餌로 成長시킨 實驗郡에서는 肝臟, 腎臟, 脾臟의 무게는 增加하였으나 다른 食餌群에서의 重量 變化는 없었다. 3. 血淸中 AST, ALT, LDH, ALP 活性은 lard, alcohol을 添加한 食餌群(Ⅱ,Ⅲ群)에 比해 有意한 감소를 나타내었다. 4. 血淸 triglyceride, total cholesterol 含量은 lard 添加食餌群(Ⅱ群)에서는 대조군에 比해 有意한 增加를 보였고, lard와 마늘을 동시에 投與한 實驗群(Ⅴ群)에서는 lard를 단독 첨가한 식이군(Ⅱ群)에 比해 有意한 감소를 나타내었다. 5. 血淸 free-cholesterol, ester cholesterol의 含量에 있어서 lard만을 攝取케한 群에 비해 마늘을 동시에 섭취케 하였을 때에는 有意한 감소를 보였다. 6. HDL-Cholesterol의 含量은 마늘만을 단독섭취케한 群에서만 增加를 볼 수 있었고 그외 群에서는 有意한 차이가 없었다. 7. 血淸중의 VLDL LDL-Cholesterol과 HDL-Cholesterol의 含量比에서는 lard를 단독 섭취케한 群과 alcohol만을 섭취케한 群이 有意的으로 높았고 마늘을 섭취케한 郡에서는 lard나 alcohol을 단독처리한 群보다 낮은 경향을 보였다. 이러한 結果로 보아 마늘 成分은 高脂血症을 개선하므로서 代謝性 疾患을 豫防하여 줄것으로 생각된다. Rats given feed containing lard and alcohol showed significantly decrease in net weight gain, but garlic caused an increase in food efficiency ratio. Lard supplementation caused an increase in the weight of liver, kindney, spleen, but another groups did not. AST, ALT, ALP, LDH of serum were significantly increase in lard and alcohol containing group but garlic feeding decreased enzyme activities compared to lard and alcohol containing group. The contents ratio of triglyceride, total cholesterol in serum of lard-fed group showed significantly increase compred to controls and but the simultaneous supplementation of garlic and lard decreased significantly than those of lard-fed group. The contents of free-cholesterol and ester cholesterol in sreum of the simultaneous supplementation of garlic decreased as compared with the lard single fed group. Garlic single-fed group increased plasma HDL-cholesterol compared to controls but in any other groups were not changed. The ratio of contents of VLDL, LDL-cholesterol and HDL-cholesterol in serum was significantly high in the only lard containing group and alcohol group, the garlic supplemented group was showed lower tendency than only lard and alcohol group. The above results suggest that garlic would prevent the metabolic disease by improving hyperlipemia.
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