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한군 ( Han Jun ),라요 ( Luo Yao ),만겸 ( Wan Qian ),배군도 ( Pei Juntao ),조녕녕 ( Zhao Ning Ning ) 한국한자한문교육학회 2014 漢字 漢文敎育 Vol.35 No.-
본고는 저학년 학생들이 쉽게 글자를 틀리게 서사하고, 쉽게 잘못 인식하는 태도에 중점을 두고 서술되었다. 선행 연구의 기초 위에서 字理교수법과 部件교수법을 상호 비교하여 보았다. 모 소학교 2학년의 두 개반을 대상으로 실험을 실시한 결과 字理교수법이 部件교수법보다 학생들의 한자 학습에 더 긍정적 효과를 미치고 있음을 알 수 있었다. 이 실험결과를 토대로 본고에서는 한자의 조자 방법을 분류하고, 字理교수 학습법을 제안하였다. With regard to the phenomenon that students often make mistakes in writing and recognizing characters in primary school in China, the study further explored han character teaching based on the previous studies, whether the approach of analyzing the principles of formation of han characters is better than approach of character-component teaching. Two classes of primary 2 students participated in the experiment, one being the control group, adopting the approach of character-component teaching; the other one being the experimental group, adopting the approach of analyzing the principles of formation of han characters. The result yielded that, han character teaching by analyzing the principles of formation of han characters can improve student’s ability in recognizing characters better than the traditional one. On that basis, character teaching strategies were sorted out according to the principles of formation of Chinese Characters.
( Pei-pei Han ),( Wen-ji Geng ),( Meng-nan Li ),( Shi-ru Jia ),( Ji-long Yin ),( Run-ze Xue ) 한국미생물 · 생명공학회 2021 Journal of microbiology and biotechnology Vol.31 No.9
Microbially induced calcium carbonate precipitation (MICP) has recently become an intelligent and environmentally friendly method for repairing cracks in concrete. To improve on this ability of microbial materials concrete repair, we applied random mutagenesis and optimization of mineralization conditions to improve the quantity and crystal form of microbially precipitated calcium carbonate. Sporosarcina pasteurii ATCC 11859 was used as the starting strain to obtain the mutant with high urease activity by atmospheric and room temperature plasma (ARTP) mutagenesis. Next, we investigated the optimal biomineralization conditions and precipitation crystal form using Plackett-Burman experimental design and response surface methodology (RSM). Biomineralization with 0.73 mol/l calcium chloride, 45 g/l urea, reaction temperature of 45°C, and reaction time of 22 h, significantly increased the amount of precipitated calcium carbonate, which was deposited in the form of calcite crystals. Finally, the repair of concrete using the optimized biomineralization process was evaluated. A comparison of water absorption and adhesion of concrete specimens before and after repairs showed that concrete cracks and surface defects could be efficiently repaired. This study provides a new method to engineer biocementing material for concrete repair.
Role of Selenium in Alteration of Erythrocyte Parameters in Bovine Fluorosis
Han, Bo,Yoon, Soon-Seek,Wu, Pei-Fu,Han, Hong-Ryul,Liang, Li-Cheng Asian Australasian Association of Animal Productio 2006 Animal Bioscience Vol.19 No.6
Signs of dental discolouration, difficulty in mastication, bony exostosis and debility were observed in cattle from Qingtongxia Ningxia, China where fluoride concentration in drinking water, soil, fodder, serum, bone, teeth, haircoat and urine were significantly higher than the corresponding health site. The problem of fluorosis in beef cattle is attributable to water containing toxic levels of fluoride. The objective of this paper was therefore to evaluate the influence of fluoride on erythrocyte parameters in cattle under high fluoride and low selenium conditions, as well as the protective efficacy of selenium exposure in feedstuff for bovine endemic fluorosis. Sixteen 6 to 7 year-old high fluoride beef cattle were randomly allotted into two groups each with eight cows: high fluoride control group, and supplemented with 0.25 mg/kg selenium per day for 83 days respectively. In addition, eight 6 to 7 year-old normal control beef cattle were selected from a non-high fluoride site. Blood samples were collected on day 0, 30 and 83 for erythrocyte parameters analysis and scanning electronic microscopy. The results indicated that erythrocytes, hemoglobin, packed cell volume values and $Na^+-K^+$ ATPase activity from affected cattle on the high fluoride site were significantly reduced during the period as compared with the corresponding samples of normal control cattle, a great number of echinocytes were present in peripheral blood, and subsequent anaemia. However, affected cattle exposed to selenium revealed increasable erythrocyte parameters, the extent of elevation in these values being dependent on the duration of supplementation with selenium. These findings suggest that fluoride exposure can cause erythrocyte damage, whereas selenium supplementation can antagonize fluoride-induced generation of free radicals and cumulative effects of lipid peroxidation in erythrocytes. Selenium supplementation may help to alleviate the possible hazards associated with bovine endemic fluorosis.
고강도 콘크리트의 폭렬방지에 미치는 폴리머수지의 형태 및 혼입율의 영향
한천구(Han Cheon-Goo),양성환(Yang Seong-Hwan),한민철(Han Min-Cheol),裴長春(Pei Chang-Chun) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.5
This study investigates the fundamental properties and examines the spalling appearances and residual compressive strength after fire test of high strength concrete depending on polymer contents and appearance. The results are summarized as following. For the flowability, the slump flows of EVA-P(Powder type Ethylene Vinyl Acetate Copolymer), PVA-F(Fiber type Polyvinyl Alcohol Copolymer), and PP-F(Fiber type Polypropylene) were slightly decreased caused by polymer contents. However, the slump flow of PVA-P appeared greatly decreasing tendency due to increased viscosity. The air contents of EVA-P, PVA-F, and PP-F were satisfied target air content, but the case of PVA-P was greatly increased over 0.1% of polymer content. The strength of 10% of EVA-P and others were slightly declined, but the strength of PVA-P was greatly decreased about 20% caused by increasing air content. The spalling appeared on EVA-P, PVA-P, PVA-F, and control concrete. However, when 0.10% of PP-F was mixed, spalling can be prevented effectively therefore PP-F with 0.10% was confirmed as favorable shape and content. After fire test, the residual compressive strength was greatly decreased because of the inner crack, and it declined about 20~30% when the spalling did not occur.
Cheng Han Ng,Kai En Chan,Yip Han Chin,Rebecca Wenling Zeng,Pei Chen Tsai,Wen Hui Lim,Darren Jun Hao Tan,Chin Meng Khoo,Lay Hoon Goh,Zheng Jye Ling,Anand Kulkarni,Lung-Yi Loey Mak,Daniel Q Huang,Mark C 대한간학회 2022 Clinical and Molecular Hepatology(대한간학회지) Vol.28 No.3
Background/Aims: Nonalcoholic fatty liver disease (NAFLD) is closely associated with diabetes. The cumulative impact of both diseases synergistically increases risk of adverse events. However, present population analysis is predominantly conducted with reference to non-NAFLD individuals and has not yet examined the impact of prediabetes. Hence, we sought to conduct a retrospective analysis on the impact of diabetic status in NAFLD patients, referencing non-diabetic NAFLD individuals. Methods: Data from the National Health and Nutrition Examination Survey 1999–2018 was used. Hepatic steatosis was defined with United States Fatty Liver Index (US-FLI) and FLI at a cut-off of 30 and 60 respectively, in absence of substantial alcohol use. A multivariate generalized linear model was used for risk ratios of binary outcomes while survival analysis was conducted with Cox regression and Fine Gray model for competing risk. Results: Of 32,234 patients, 28.92% were identified to have NAFLD. 36.04%, 38.32% and 25.63% were non-diabetic, prediabetic and diabetic respectively. Diabetic NAFLD significantly increased risk of cardiovascular disease (CVD), stroke, chronic kidney disease, all-cause and CVD mortality compared to non-diabetic NAFLD. However, prediabetic NAFLD only significantly increased the risk of CVD and did not result in a higher risk of mortality. Conclusions: Given the increased risk of adverse outcomes, this study highlights the importance of regular diabetes screening in NAFLD and adoption of prompt lifestyle modifications to reduce disease progression. Facing high cardiovascular burden, prediabetic and diabetic NAFLD individuals can benefit from early cardiovascular referrals to reduce risk of CVD events and mortality.
PP섬유 혼입에 의한 60~100㎫급 고강도 콘크리트의 폭렬방지
한천구(Han Cheon-Goo),양성환(Yang Seong-Hwan),한민철(Han Min-Cheol),裴長春(Pei Chang-Chun) 대한건축학회 2008 大韓建築學會論文集 : 構造系 Vol.24 No.4
This paper presents the results of spalling occurrence and residual strength of the high strength concrete with 60~100 ㎫ (W/B 15~35%) subjected to fire depending on PP fiber contents. It is found that addition of above 0.25% of PP fiber resulted in protecting from spalling occurrence of the ultra high strength concrete with W/B of 15%. On the other hand, such amount of PP fiber led to a reduction of fluidity of fresh concrete, and thereby, increase of superplasticizer dosages or replacement of fiber or change of method is necessary for practical application at the job site. Proper amount of PP fiber for protecting from spalling is found to be more than 0.1% in the high strength concrete with W/B of 25% and 35%, and such amount of PP fiber did not affect the fluidity of fresh concrete significantly. Therefore, optimum amount of PP fiber to protect from spalling is determined to be 0.10% in the region of 60~80 ㎫ of the high strength concrete.