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Assessment of the clear-sky bias issue using continuous PM10 data from two AERONET sites in Korea

Journal of Environmental Sciences 2017年第3期29卷 151-160页

作者： Yongjoo Choi young sung ghim Department of Environmental Science Hankuk University of Foreign StudiesYongin 449-791Korea

A bias in clear-sky conditions that will be involved in estimating particulate matter （PM） concentration from aerosol optical depth （AOD） was examined using PM10 from two Aerosol Robotic Network sites in Korea. The study periods were between 2004 and 2007 at Anmyon and between 2003 and 2011 at Gosan, when both PM10 and AOD were available. Mean PM10 when AOD was available （PMAOD） was higher than that from all PM10 data （PMall） by 5.1 and 9.9 μg/m3 at Anmyon and Gosan, which accounted for 11% and 26% of PMall, respectively. Because of a difference between mean PM10 under daytime clear-sky conditions （PMclear） and PMAoD, the variations in APM10, the difference of PMan from PMdear rather than from PMAoD, were investigated. Although monthly variations in APMlo at the two sites were different, they were positively correlated to those in AT, similarly defined as APM10 except for temperature, at both sites. APM10 at Anmyon decreased to a negative value in January due to an influence of the Siberian continental high-pressure system while APM10 at Gosan was high in winter due to an effect of photochemical production at higher temperatures than at Anmyon.

关键词： AERONETData recovery rateCloud amountWind speedPhotochemical productionSiberian high

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Three-dimensional kagome structures in a PCL/HA-based hydrogel scaffold to lead slow BMP-2 release for effective bone regeneration

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Bio-Design and Manufacturing 2023年第1期6卷 12-25页

作者： Se-Hwan Lee Kang-Gon Lee Jaeyeon Lee Yong Sang Cho Min-Soo ghim Soojin Kim Su-Jin Heo Yongdoo Park young-Sam Cho Bu-Kyu Lee McKay Orthopaedic Research Laboratory Department of Orthopaedic SurgeryPerelman School of MedicineUniversity of Pennsylvania36th Street and Hamilton WalkPhiladelphiaPA 19104USA Department of Biomedical Sciences College of MedicineKorea University73Goryeodae-roSeongbuk-guSeoul 02841Republic of Korea Medical Device Development Center Daegu-Gyeongbuk Medical Innovation Foundation(K-MEDI hub)80Cheombok-roDong-guDaegu 41061Republic of Korea Department of Mechanical Engineering College of EngineeringWonkwang University460Iksan-daeroIksan 54538Republic of Korea Biomedical Engineering Research Center Asan Institute for Life SciencesAsan Medical Center88Olympic-roSongpa-guSeoul 05505Republic of Korea Department of Mechanical Design Engineering College of EngineeringWonkwang University460Iksan-daeroIksan 54538Republic of Korea MECHABIO Group Wonkwang University460Iksan-daeroIksan 54538Republic of Korea Department of Oral and Maxillofacial Surgery Asan Institute for Life SciencesAsan Medical Center88Olympic-roSongpa-guSeoul 05505Republic of Korea

Osteoconductive function is remarkably low in bone disease in the absence of bone tissue surrounding the grafting site,or if the bone tissue is in poor ***,an effective bone graft in terms of both osteoconductivity and osteoinductivity is required for clinical ***,the three-dimensional(3D)kagome structure has been shown to be advantageous for bone tissue regeneration due to its mechanical *** this study,a polycaprolactone(PCL)kagome-structure scaffold containing a hyaluronic acid(HA)-based hydrogel was fabricated using a 3D printing *** retention capacity of the hydrogel in the scaffold was assessed in vivo with a rat calvaria subcutaneous model for 3 weeks,and the results were compared with those obtained with conventional 3D-printed PCL grid-structure scaffolds containing HA-based hydrogel and bulk-type HA-based *** retained hydrogel in the kagome-structure scaffold was further evaluated by in vivo imaging system *** further reinforce the osteoinductivity of the kagome-structure scaffold,a PCL kagome-structure scaffold with bone morphogenetic protein-2(BMP-2)containing HA hydrogel was fabricated and implanted in a calvarial defect model of rabbits for 16 *** bone regeneration characteristics were evaluated with hematoxylin and eosin(H&E),Masson’s trichrome staining,and micro-CT image analysis.

关键词： Kagome-structure scaffold Retention capacity Biomimetic hydrogel Bone morphogenetic protein-2(BMP-2)

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沙尘暴事件中大气颗粒物化学组分的浓度变化和硫酸盐的形成

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环境科学研究 2005年第6期18卷 12-17页

作者：刘咸德董树屏李冰高占君李玉武 MOON Kil-Choo ghim young sung 中国环境科学研究院北京100012 国家环境分析测试中心北京100029 国家地质实验测试中心北京100037 烟台环境监测中心站山东烟台264003 韩国科学技术研究院

应用电感耦合等离子体原子发射光谱、质谱和离子色谱分析了2002年3月28日—4月8日在山东长岛县采集的共11对粗、细大气颗粒物样品的化学组成,探讨4月6—8日沙尘暴事件中大气颗粒物化学组分的变化和硫酸盐的形成。沙尘暴事件应区分前锋... 详细信息

应用电感耦合等离子体原子发射光谱、质谱和离子色谱分析了2002年3月28日—4月8日在山东长岛县采集的共11对粗、细大气颗粒物样品的化学组成,探讨4月6—8日沙尘暴事件中大气颗粒物化学组分的变化和硫酸盐的形成。沙尘暴事件应区分前锋和后续部分,前锋与大气中各种污染物相互作用,具有硫富集的特征。后续部分较好地保持了长距离传输风沙尘本身的特征。硫酸盐的形成机理可能是多相氧化而不是简单的酸碱中和。硫酸铵是首先生成的含硫物种,这是细颗粒主导的形成过程。硫酸铵逐渐转化为其他硫酸盐,硫的成分也逐渐向粗颗粒转移。在沙尘暴事件中含硫污染物不但有一个从气相向颗粒物转变的过程,也有一个从细颗粒向粗颗粒转化的过程。

关键词：大气颗粒物沙尘暴事件硫酸盐形成

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