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여현구,홍정주,이영전,이경식,전창엽,박정형,원진영,서진철,안유진,김건우,백승호,황은하,김그린,진영배,정강진,구본상,강필용,임경섭,김선욱,허재원,김영현,손영훈,김지수,최치훈,차상훈,이상래 한국뇌신경과학회 2019 Experimental Neurobiology Vol.28 No.4
The function of microglia/macrophages after ischemic stroke is poorly understood. This study examines the role of microglia/macrophages in the focal infarct area after transient middle cerebral artery occlusion (MCAO) in rhesus monkeys. We measured infarct volume and neurological function by magnetic resonance imaging (MRI) and non-human primate stroke scale (NHPSS), respectively, to assess temporal changes following MCAO. Activated phagocytic microglia/macrophages were examined by immunohistochemistry in post-mortem brains (n=6 MCAO, n=2 controls) at 3 and 24 hours (acute stage), 2 and 4 weeks (subacute stage), and 4, and 20 months (chronic stage) following MCAO. We found that the infarct volume progressively decreased between 1 and 4 weeks following MCAO, in parallel with the neurological recovery. Greater presence of cluster of differentiation 68 (CD68)-expressing microglia/macrophages was detected in the infarct lesion in the subacute and chronic stage, compared to the acute stage. Surprisingly, 98~99% of transforming growth factor beta (TGFβ) was found co-localized with CD68-expressing cells. CD68-expressing microglia/macrophages, rather than CD206+ cells, may exert anti-inflammatory effects by secreting TGFβ after the subacute stage of ischemic stroke. CD68+ microglia/macrophages can therefore be used as a potential therapeutic target.
국방 핵심기술 R&D 효율성 분석에 관한 연구 : GSFA와 DEA의 적용을 중심으로
여현구,이춘주 한국혁신학회 2020 한국혁신학회지 Vol.15 No.4
In this study, the efficiency of the defense critical technology R&D project was analyzed by applying DEA and GSFA. In consideration of the cycle of the Defense Science and Technology Promotion Policy, which presents the policy direction of defense science and technology innovation, the efficiency of each project task was derived for the defense critical technology R&D projects conducted from 2003 to 2017. And then the impact of the project promotion characteristics such as the project supervising agency, defense science and technology classification, weapon system classification, and the target period of defense science and technology promotion policy was analyzed. We discussed the approach and applicability of applying economies of scale derived from GSFA, a multi-output parametric efficiency analysis methodology newly proposed in the 2019 literature, to DEA, a non-parametric efficiency analysis methodology. Through this, it was indirectly confirmed that the defense R&D policy, which expanded creative and challenging technology development, led to technological change in the defense critical technology R&D project and had an effect on technical efficiency. 본 연구에서는 GSFA와 DEA를 적용하여 국방 핵심기술 R&D 사업의 효율성을 분석하였다. 국방과학기술 혁신의 정책방향을 제시하는 국방과학기술진흥정책서의 주기를 고려하여2003년부터 2017년까지 수행한 국방 핵심기술 R&D 응용연구 사업을 대상으로 사업과제별효율성을 도출하고, 사업 주관기관, 국방과학기술분류, 무기체계분류, 국방과학기술 진흥정책 대상기간 등 사업추진 특성에 따른 영향을 분석하였다. 2019년 문헌에 새롭게 제시된다수 산출 모수적 효율성 분석방법론인 GSFA로부터 도출한 규모의 경제성을 비모수적 효율성 분석방법론인 DEA에 적용하는 접근법과 적용성을 논하였다. 이를 통해 창의⋅도전적기술개발을 확대하는 국방R&D 정책이 국방 핵심기술 R&D사업의 기술 변화를 이끌었고기술 효율성에 영향을 미쳤다는 것을 간접적으로 확인하였다.
안성 지역 소나무 잎과 토양 중 PBDEs의 농도 수준 및 특성
여현구,조기철,천만영,Yeo, Hyun-Gu,Cho, Ki-Chul,Chun, Man-Young 한국환경보건학회 2006 한국환경보건학회지 Vol.32 No.2
Polybrominated diphenyl ethers (PBDEs) in pine needles and soil samples from rural area were analyzed in this study. Concentrations of PBDE congeners were ranged between 0.2 and 3104 pg/g DW(dry weight) in pine needles and between 2.4 and 1997 pg/g DW in soil samples. The most abundant congener both in pine needles and soil samples was BDE-209, which was related to importation and production of deca-BDE technical mixtures in Korean industry. And BDE-99, BDE-47, BDE-100 deposited in pine needles and soil samples were closely matched with the major constituents of the penta-BDE technical mixture. Those can be interpreted as an evidence that transfer of the congeners in deca-BDE and penta-BDE technical mixtures from source to pine needle and soil occurs with broadly similar efficiency. Correlation coefficient(r) of PBDE congeners deposited in pine needles and soil samples is very significant because it implies th at there has been little weathering/degradation/alteration of the congeners generated from sources during atmospheric transport or within pine needles and soil themselves.