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Remote Sensing and Landscape Metrics-Based Forest Physical Degradation: Two-Decades Assessment in Gishwati-Mukura Biological Corridor in Rwanda, East-Central Africa

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Journal of Geoscience and Environment Protection 2022年第4期10卷 64-81页

作者： Hassina Uwiringiyimana jaeyong choi Department of Environment and Forest Resources Chungnam National University Daejeon Republic of Korea

The management of forest corridors and related ecology is one of the effective strategies to minimize the adverse effects of forest degradation. It controls the connectivity of inhabitant species and the connection of the isolated patches. This study analyzed spatial and temporal forest physical degradation based on forest cover change and forest fragmentation in the Gishwati-Mukura biological corridor from 1990-2019. Remotely sensed datasets, Geographical Information System (GIS) and FRAGSTATS software were used to analyze the spatial and temporal physical degradation and changes in forest cover. The results indicated that the Gishwati-Mukura corridor experienced massive deforestation where approximately 7617.1 ha (64.22%) of forest cover was completely cleared out, which implies an annual forest loss of 262.6 ha·year-1 (2.21%) during 1990-2019. The forest cover transitions patterns and geostatistical analysis indicated that extensive deforestation was associated with intensive agriculture. The results demonstrated that agriculture has dramatically increased from 29.46% in 1990 to 57.22% in 2019, with an annual increase of 1.97%. Since Gishwati-Mukura has changed to National Park (NP), it lacks diversified scientific studies addressing the analysis of the remote and spatial patterns to investigate its physical degradation and landscape dynamics. This research study will serve as remote forest analysis gap-filling and as the cornerstone of numerous other research that will contribute to the improvement of the connectivity assessments along the Gishwati-Mukura corridor and other related ecosystems.

关键词： Landscape Metrics Remote Sensing Geographic Information System (GIS) Forest Physical Degradation Biological Corridor National Park

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Flexible micro-LED display and its application in Gbps multi-channel visible light communication

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npj Flexible Electronics 2022年第1期6卷 973-979页

作者： Luhing Hu jaeyong choi Sumin Hwangbo Do-Hoon Kwon Bongkyun Jang Seunghyeon Ji Jae-Hyun Kim Sang-Kook Han Jong-Hyun Ahn School of Electrical and Electronic Engineering Yonsei UniversitySeoul 03722Republic of Korea Department of Nanomechanics Nano-Convergence Mechanical Systems Research DivisionKorea Institute of Machinery&Materials(KIMM)156 Gajeongbuk-roYuseong-guDaejeon 34103Republic of Korea

A flexible full-color micro-LED display with high mechanical robustness was fabricated by printing quantum dots(QDs)on a blue micro-LED array using standard *** red and green colors yielded from QDs exhibit a better color gamut than conventional color *** light conversion efficiency was enhanced by adding TiO2 nanoparticles to the QD-photoresist *** full-color micro-LED display was successfully mounted on various unusual substrates such as curved glass,fabrics,and human skin,enabling diverse optoelectronic *** addition,wireless multi-channel visible light communication(VLC)based on the wavelength-division-multiplexing orthogonal-frequency-division-multiplexing(WDM-OFDM)technique was demonstrated using a QD-based color micro-LED panel.A high data transmission rate of 1.9 Gbps was successfully obtained owing to the high electrical-optical modulation bandwidth of the QD-based micro-LED panel.

关键词： communication Gbps visible

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腐植酸和硝酸银存在下银纳米粒子对细菌的吸收

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腐植酸 2013年第3期 31-36页

作者： Eunjoo Bae Hee-Jin Park jaeyong Yoon Younghun Kim Kyunghee choi Jongheop Yi 韩立新首尔国立大学化学与生物工程学院首尔151742 光云大学化学工程学系首尔139701 国家环境研究所仁川404708 中国腐植酸工业协会北京100120

银纳米粒子(AgNPs)是一种潜在的抗菌材料,会引起细胞膜的损伤,并能产生活性氧(ROS)。由此产生的细胞膜的结构性变化能够增加银离子和AgNPs在细胞中的渗透能力。为了进一步阐述这个问题,我们测试了这种纳米材料的体内和体外细胞毒性,并... 详细信息

银纳米粒子(AgNPs)是一种潜在的抗菌材料,会引起细胞膜的损伤,并能产生活性氧(ROS)。由此产生的细胞膜的结构性变化能够增加银离子和AgNPs在细胞中的渗透能力。为了进一步阐述这个问题,我们测试了这种纳米材料的体内和体外细胞毒性,并通过这种方法来量化和评估它们的纳米毒性。考虑到AgNPs在环境中的行为,毒性可能受到其物理化学性质(尺寸、附聚率、在腐植酸上的吸附性能)和毒性抑制性质的差异影响。我们通过附聚和吸附动力学研究了细胞吸收AgNPs的作用。试验发现,尺寸小于14nm的AgNPs的附聚和吸附高于尺寸为90nm和140nm的AgNPs的附聚和吸附。对于大小为90nm和140nm的AgNPs,吸附作用显著大于附聚作用。值得注意的是,在正规概念下,AgNPs越小越容易被吸收这一正常概念在非生物因素相互作用下可能是错误的。

关键词：银纳米粒子附聚吸附腐植酸盐度大肠杆菌

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