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Predicting the impacts of climate change on nonpoint source pollutant loads from agricultural small watershed using artificial neural network

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Journal of Environmental Sciences 2010年第6期22卷 840-845页

作者： eunjeong lee Chounghyun Seong Hakkwan Kim Seungwoo Park Moonseong Kang Department of Landscape Architecture and Rural Systems Engineering Research Institute for Agricultural & Life Sciences Seoul National University

This study described the development and validation of an artificial neural network （ANN） for the purpose of analyzing the effects of climate change on nonpoint source （NPS） pollutant loads from agricultural small watershed. The runoff discharge was estimated using ANN algorithm. The performance of ANN model was examined using observed data from study watershed. The simulation results agreed well with observed values during calibration and validation periods. NPS pollutant loads were calculated from load-discharge relationship driven by long-term monitoring data. LARS-WG （Long Ashton Research Station-Weather Generator） model was used to generate rainfall data. The calibrated ANN model and load-discharge relationship with the generated data from LARS-WG were applied to analyze the effects of climate change on NPS pollutant loads from the agricultural small watershed. The results showed that the ANN model provided valuable approach in estimating future runoff discharge, and the NPS pollutant loads.

关键词： artificial neural network climate change LARS-WG nonpoint source pollution runoff

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Anticancer,antiobesity,and anti-inflammatory activity of Artemisia species invitro

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Journal of Traditional Chinese Medicine 2013年第1期33卷 92-97页

作者： eunjeong Choi Heesook Park Jehyuk lee Gunhee Kim Plant Resources Research Institute Duksung Women's University

OBJECTIVE： To investigate the anticancer, antiin flammatory, and antiobesity activity of methanol extracts of eight distinct species： Artemisia Stolon ifera （AST）, Artemisia Selengensis （ASE）, Artemisia .la ponica, Artemisia Montana, Artemisia Capillaris （ACA）, Artemisia Sylvatica （ASY）, Artemisio Keiskeana （AKE）, and Artemisia Scoparia （ASC） in vitro. METHODS： Antiproliferative activity was investigat ed in human breast cancer estrogen receptora pos itive T47D and negative HS578T cell lines exposed to the extracts at various concentrations （5200 mgl mL）for24, 48, and 72 h. For evaluating the antiin flammatory activity of the extracts, inhibition of ni trite synthesis was investigated in lipopolysaccha ride （LPS）stimulated cultures of macrophages cells exposed to 10, 50, 100, and 200 mglmL for 24 h. The antiobesity activity of the extracts was deter mined as triglyceride content and by a lipolysis as say in differentiated 3T3LI cells exposed to the extracts for 72 h at the same concentrations de scribed above. RESULTS： All extracts showed similar antiprolifera tive activity in a dose and timedependent man ner in HS578T cells. Although extracts at lower con centrations and shorter times stimulated growth of T47D cells, the antiproliferative effects of the extracts on T47D cells at higher concentrations （〉100 mg/ mL） for 72 h were significantly greater than those of HS578T cells. In case of antiinflammatory activi ty, some extracts （AST, ASE, ACA, and AKE） signifi cantly reduced nitric oxide production at higher concentrations in the presence of LPS compared with that in control cells. Antiobesity activity was showed with reducing lipid accumulation signifi cantly （〉50%） at concentrations above 100 mg/mL in most extracts （except AST and ACA）. Additional ly, AKE and ASC increased lipolysis by 11%24% compared with that in the control. CONCLUSION： Artemisia spp. demonstrates poten tial as bioactive food supplements.

关键词： Artemisia Anticancer Anti-inflammatory Antiobesity In vitro

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3D-printed gelatin methacrylate (GelMA)/ silanated silica scaffold assisted by two-stage cooling system for hard tissue regeneration

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Regenerative Biomaterials 2021年第2期8卷 50-63页

作者： eunjeong Choi Dongyun Kim Donggu Kang Gi Hoon Yang Bongsu Jung MyungGu Yeo Min-Jeong Park SangHyun An KyoungHo lee Jun Sik Kim Jong Chul Kim Woonhyeok Jeong Hye Hyun Yoo Hojun Jeon Research Institute of Additive Manufacturing and Regenerative Medicine Baobab Healthcare Inc55 Hanyangdaehak-RoAnsanGyeonggi-do 15588South Korea Department of Mechanical Engineering Korea Polytechnic UniversitySangidaehak-roSiheungGyeonggi-do 15073South Korea Medical Device Development Center Daegu-Gyeongbuk Medical Innovation Foundation(DGMIF)80Cheombok-roDong-guDaegu 41061South Korea Laboratory Animal Center Daegu-Gyeongbuk Medical Innovation Foundation(DGMIF)80 Cheombok-roDong-guDaegu 41061South Korea Department of Plastic and Reconstructive Surgery Dongsan Medical CenterKeimyung University College of Medicine1035 Dalgubeol-daeroDalseo-guDaegu 42601South Korea Institute of Pharmaceutical Science and Technology College of PharmacyHanyang University55 Hanyangdaehak-RoAnsanGyeonggi-Do 15588South Korea

Among many biomaterials,gelatin methacrylate(GelMA),a photocurable protein,has been widely used in 3D bioprinting process owing to its excellent cellular responses,biocompatibility and ***,GelMA still shows a low processability due to the severe temperature dependence of *** overcome this obstacle,we propose a two-stage temperature control system to effectively control the viscosity of *** optimize the process conditions,we evaluated the temperature of the cooling system(jacket and stage).Using the established system,three GelMA scaffolds were fabricated in which different concentrations(0,3 and 10 wt%)of silanated silica particles were *** evaluate the performances of the prepared scaffolds suitable for hard tissue regeneration,we analyzed the physical(viscoelasticity,surface roughness,compressive modulus and wettability)and biological(human mesenchymal stem cells growth,western blotting and osteogenic differentiation)***,the composite scaffold with greater silica contents(10 wt%)showed enhanced physical and biological performances including mechanical strength,cell initial attachment,cell proliferation and osteogenic differentiation compared with those of the *** results indicate that the GelMA/silanated silica composite scaffold can be potentially used for hard tissue regeneration.

关键词： 3D bioprinting gelatin methacrylate silanated silica cooling system human mesenchymal stem cells

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