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RISS 인기검색어
- 검색키워드
- 저자 : Leti, Guillaume (검색결과 3 건)
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Marsed Leti,Hüseyin Bilgin 국제구조공학회 2024 Structural Engineering and Mechanics, An Int'l Jou Vol.89 No.5
This study evaluates the seismic performance of a premodern six story reinforced concrete building typology designed during the communism period of Albania and build throughout the country. During the November 26, 2019 Earthquake in Albania, the most affected reinforced concrete buildings were among the old templates, lacking shear walls and inadequate reinforcement details which suffer from concrete aging. The mathematical model of the selected building is done in the environments of ZeusNL software, developed especially for earthquake engineering applications. The capacity curve of the structure is gained using the conventional static nonlinear analysis. On the other hand, the demand estimation is utilized using one of the recent methods known as Incremental Dynamic Analysis with a set of 18 ground motion records. The limit states in both curves are defined based on the modern guidelines. For the pushover, immediate occupancy (IO), life safety (LS) and collapse prevention (CP) are plotted in the same graph with capacity curve. Furthermore, on each IDA derived, the IO, CP and global instability (GI) are determined. Moreover, the IDA fractiles are generated as suggested by the literature, 16%, 50% (median) and 84%. In addition, the comparative assessment of the IDA median with capacity curve shows good correlation points. Lastly, this study shows the approach of determination of LS in IDA fractiles for further vulnerability assessment based on the local seismic hazard map with 95 and 475 return period.
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Sun, Yuning,Yun, Ki Nam,Leti, Guillaume,Lee, Sang Heon,Song, Yoon-Ho,Lee, Cheol Jin IOP 2017 Nanotechnology Vol.28 No.6
<P>Carbon nanotube (CNT) paste emitters were fabricated using graphite nanopowder filler. The CNT paste emitters consist of CNTs as the emitting material, graphite nanopowder as the filler and a graphite rod as the cathode. Rather than metal or inorganic materials, graphite nanopowder was adapted as a filler material to make the CNT paste emitters. After fabricating the emitters, sandpaper treatment was applied to increase the density of emission sites. The CNT paste emitters showed a high field emission performance, for example a high emission current of 8.5 mA from a cylindrical emitter with a diameter of?0.7 mm (corresponding to a current density of 2.2 A cm<SUP>−2</SUP>) and an extremely stable emission current at 1 mA (260 mA cm<SUP>−2</SUP> for 20 h). Interestingly, after a number of electrical arcing events, the emitters still showed a high emission current of 5–8 mA (higher than 1 A cm<SUP>−2</SUP>). In addition to the sound electrical and thermal properties of the graphite filler, effective mechanical adhesion of the CNTs onto the graphite cathode induced by the use of the graphite nanopowder filler contributed the excellent field emission properties of the CNT paste emitters.</P>
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Sanudin,Ary Widiyanto,Eva Fauziyah,Leti Sundawati 한국산림과학회 2023 Forest Science And Technology Vol.19 No.3
The COVID-19 pandemic has created impacts on various aspects of life and caused a shock to all sectors, including agriculture. The Indonesian government continues encouraging access for communities to be involved in forest management through social forestry pro- grams Minister of Environment and Forestry Regulation No. 9 of 2021 on Social Forestry Management is Indonesia’s latest policy regulating social forestry. For Java Island, the social forestry program is regulated by the Minister of Environment and Forestry Regulation No. 39 of 2017. Traditional agroforestry has been carried out by farmers throughout Indonesia for a long time, both in state forest areas through social forestry programs and on private land dominated by woody tree species called private forests. This research aims to examine the resilience of agroforestry farmers in social forestry areas and private forest during the COVID-19 pandemic in Indonesia. This research was conducted in Garut and Bandung Districts, West Java Province, Indonesia, from May to July 2022. Interviews were performed with 219 respondents from six farmer groups: four groups that obtained social forestry per- mits through the recognition and protection of forestry partnerships (pengakuan dan perlin- dungan kemitraan kehutanan/KULIN KK) scheme and two groups in a private forest. The household livelihood resilience approach was used to analyze the agroforestry farmers’ resili- ence, comprised of financial, human, social, physical, and natural capital. Data were proc- essed with a Likert scale (1, 2, and 3) and visualized using a spider diagram to compare and distinguish the five types of capital. The results showed the COVID-19 pandemic affected both social forestry and private forest farmers, where there was a decrease in agroforestry product prices and an increase in production input prices. These excluded private forest products, specifically cardamom, which has increased prices. Agroforestry farmers in the pri- vate forest have higher resilience than social forestry. These results highlight the need to increase financial capital, which has the lowest value for increasing household resilience. The level of resilience is influenced by the characteristics of farmers, especially their level of edu- cation, land ownership, and income. Based on the results, capital assistance, market access, and training related to post-harvesting are strategies for improving resilience. The results also contributed to efforts needed to increase the resilience of social forestry and private for- est farmers during the COVID-19 pandemic. Further research is needed to determine the resilience of agroforestry farmers in social forestry and community forests after the COVID-19 pandemic.
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