• Title/Summary/Keyword: Eco-friendly mitigate

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Novel Algicidal Substance (Naphthoquinone Group) from Bio-derived Synthetic Materials against Harmful Cyanobacteria, Microcystis and Dolichospermum (유해 남조류 Microcystis와 Dolichospermum에 대하여 선택적 제어가 가능한 생물유래 살조물질 (Naphthoquinone 계열))

  • Joo, Jae-Hyoung;Cho, Hoon;Han, Myung-Soo
    • Ecology and Resilient Infrastructure
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    • v.3 no.1
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    • pp.22-34
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    • 2016
  • We developed a biologically-derived substance naphthoquinone (NQ) derivate for the eco-safe mitigation of harmful cyanobacteria blooms such as Microcystis and Dolichospermum. NQ was reacted with various substituents ($R_n$) to produce different NQ derivatives. We tested a total of 92 algicidal compounds based on the algicidal activity of Microcystis and Dolichospermum. 22 compounds of NQ were selected as candidates (algicidal activity >80% at $1{\mu}M$). Among them, NQ 40 compound showed the highest algicidal activity of 99.6% and 100% at the optimal concentration of $1{\mu}M$ on Microcystis and Dolichospermum, respectively. No algicidal effects of NQ 40 ($1{\mu}M$) were observed against non-target algae such as Stephanodiscus, Cyclotella and Peridinium. According to the results of acute eco-toxicity assessment, the $EC_{50}$ values of NQ 40 compound for Selenastrum capricornutum and Daphnia magna were 3.2 and $14.5{\mu}M$, respectively, and the $LC_{50}$ for Danio rerio was $15.7{\mu}M$. In addition, for D. magna chronic eco-toxicity assessment, no toxicity toward survival, growth and reproduction was observed. Therefore, we suggested the NQ 40 ($1{\mu}M$) compound as an alternative eco-safe algicidal substance to effectively mitigate harmful cyanobacteria blooms.

Development of an Urban Folding Bike for Public Transportation (대중교통 연계를 고려한 도심형 접이식 자전거 개발)

  • Jung, T.S.
    • Transactions of Materials Processing
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    • v.22 no.1
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    • pp.42-47
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    • 2013
  • The bicycle is one of the most important eco-friendly transport methods which can mitigate global warming. The portability of a bike on public transportation systems is essential for the wide spread use of bicycles by people in urban environments. In this study, a lightweight urban folding bike was developed with careful consideration of the association with public transport. A folding frame using a moving slide link mechanism made from AL6061 is proposed. Numerical analysis was conducted to evaluate structural safety of the bike in both vertical and pedal loading tests. The proposed urban folding bicycle weights only 10kg and summation of its width, length, and height in the folded configuration is under 158cm.

Scoping for Environmental Impact and System Improvement of Marine Sand Mining in Korea (바다골재채취에 따른 환경영향 스코핑과 제도개선)

  • Lee, Dae-In;Eom, Ki-Hyuk;Jeon, Kyeong-Am;Kim, Gui-Young
    • Journal of Environmental Impact Assessment
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    • v.19 no.3
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    • pp.335-345
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    • 2010
  • This paper assessed environmental impacts of marine sand mining on coastal areas and Exclusive Economic Zones (EEZs) of Korea, and diagnosed problems of the related assessment statements for suggesting key assessment items (scoping) and system improvement. To mitigate conflicts and environmental impacts caused by large-scale, concentrated sand mining, we suggest it is critical to promote sustainable and eco-friendly utilization of marine resources while listening opinions from various stakeholders and analyzing alternative plans. Especially, it should be mandatory as a scoping item to provide verifiable data on the amount of sand, potential and accumulative impacts by mining, and key assessment items (e.g. erosion and sedimentation by submarine topography, benthic change, spreading of suspended solids, water pollution, grain-size change, and impact on fisheries resources). We also suggest that postassessment and monitoring should be improved to enable tracking of environmental impacts caused by sand mining through seasonal monitoring together with intermittent short-term surveys. In addition, effective measures to mitigate the impacts is also essential. As repeated sand mining at large-scale can damage marine ecosystems by long-term accumulated impacts, we suggest that assessment systems and regulatory policies should be developed and established, especially for ensuring reliability of assessment and review on selected major sandmining projects.

A study on climate design using cold air flow to reduce air contaminant concentration of underground garage in the apartment complex (냉기류를 이용하여 공동주택단지 내 지하주차장 오염농도를 저감하는 기후 디자인에 관한 연구)

  • Kim, Tae Han;Cho, Kyung Hak;Chroi, Ji Hye;Kim, Seog cheol
    • KIEAE Journal
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    • v.11 no.1
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    • pp.29-38
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    • 2011
  • This study suggested practical application of climate design on apartment complex with the focus on the use of Cold Air Flow and green building design method. The domestic research on the wind path analysis has been associated since the early 21th century in urban planning and site planning, this initiative study aimed to mitigate the urban heat island effect and to promote the sustainable urban development. It is, however, mostly focused on the flow analysis and heat flow in the urban context, due to the poor application of the wind path analysis in actual planning and design. Special attention is paid to the possibilities of identifying and developing the application methods in relation to Cold Air Flow and building design. This study examined these relations and suggested some trenchant approach to a more comprehensive and efficient use of the wind flow analysis in climate design.

Study on the Heat Dissipation Behavior of Diecast Mg Inverter Housing for Eco-friendly Hybrid Vehicles (친환경 전기 하이브리드 자동차용 마그네슘 다이캐스팅 인버터 하우징의 열방출 특성)

  • Cho, In-Sung;Han, Yo-Sub;Lee, Seung-Jae;Lee, Byung-jun
    • Journal of Korea Foundry Society
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    • v.38 no.3
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    • pp.60-65
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    • 2018
  • In the present study, the characteristics of Mg inverter cases for hybrid cars are investigated. Concerns over the use of lightweight materials to reduce energy use and to mitigate emission problems are inevitable in the twenty-first century. Magnesium is a promising material for the manufacturing of lightweight parts. Several cases for thermal cooling channels have been designed and simulated, and the effects of materials and coatings on the thermal cooling efficiency have been discussed. The effects of the coating thickness on heat extraction in an Mg inverter housing case using the PEO (plasma electrolyte oxidation) coating method were also discussed. In order to produce an inverter case by the diecasting process, the filling sequence and cooling behavior during the diecasting process were simulated. The optimized process conditions from the simulation result were then used in a trial diecasting experiment.

Prediction of Environmental Change and Mitigation plan for large scale reclamation (대규모 매립에 대한 환경영향예측과 저감방안에 관한 연구)

  • Shin, Bum-Shick;Kim, Kyu-Han
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.22 no.2
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    • pp.95-100
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    • 2010
  • In this study we predicted some of the negative effects on the ocean ecosystem and water quality, caused by a coastal reclamation project in semi-closed bay that makes it extremely difficult to be purified by natural process. In order to predict change of water quality triggered by coastal reclamation, the 3D hydrodynamic model and material cycle model are used. And we suggested new ecological park, an artificial beach and eco-friendly revetments on the reclamation area to mitigate the environmental impacts affecting this area using the numerical simulation results and observation data.

A Novel Approach for the Particulate Matter(PM) Reduction in the Industrial Complex using Integrated Data Platform (통합데이터 플랫폼을 활용한 산업단지 미세먼지 저감 방안)

  • Chung, Seokjin;Jung, Seok
    • Resources Recycling
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    • v.29 no.1
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    • pp.62-69
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    • 2020
  • Manufacturing processes in industrial complexes produce NOx, SOx, VOCs, which cause particulate matter (PM). Therefore, this study analyzed the characteristics of each industrial complex by using scattered public data, matched the existing particulate matter(PM) reduction technology, and proposed an optimized reduction plan. The application of matching technologies and facilities by industrial complexes based on data is able to mitigate NOx, SOx, and VOCs which cause particulate matter in the process in advance. This way can be an effective alternative in order to reduce PM in the manufacturing processes as well as industrial complexes.

Study on Solution-Processed Flexible Electrochromic Devices with Improved Coloration Efficiency and Stability

  • Gihwan Song;Haekyoung Kim
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.36 no.1
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    • pp.1-9
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    • 2023
  • According to the recent global warming, it is necessary to use energy efficiently together with eco-friendly energy. The development of alternative technologies is requisite for managing the current energy and climate crises. In this regard, "smart windows," which can control solar radiation, can be used to mitigate energy demands. Electrochromic devices (ECDs) effectively control the amount of solar energy reaching commercial and other living areas and maintain climate conditions via color modulation in response to small external stimuli, such as temperature and light irradiation. However, the performance and the stability of ECDs depend on the state of the electrolyte and sealing of the device. To resolve the aforementioned issues, an ECD was manufactured by using a poly (methyl methacrylate) (PMMA)-based gel polymer electrolyte (GPE), and a laminating method was used to adequately seal the ECD. The concentrations of PMMA, acetonitrile (ACN), and ferrocene (Fc) were controlled to optimize the composition of the GPE to achieve an enhanced electrochromic performance. The fabricated GPE-based ECD afforded high optical contrast (~81.92%), with high electrochromic stability up to 10,000 cycles. Moreover, the lamination method employing the GPE could be used to fabricate large-area ECDs.

Verification of the Effect of Liquefied Pig Manure on Reducing Nitrous Oxide Generation (돈분 액비의 아산화질소 발생 저감 효과 검정)

  • Pyeong Ho Lee;Ji Hyeon Baek;Yeonjong Koo
    • Korean Journal of Environmental Agriculture
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    • v.42 no.4
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    • pp.418-426
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    • 2023
  • This study focused on nitrous oxide, a major greenhouse gas produced in agricultural settings through bacterial nitrogen oxidation in aerobic soil. Nitrogen fertilizer in farmland is identified as a primary source of nitrous oxide. The importance of reducing excess nitrogen in soil to mitigate nitrous oxide production is well-known. The study investigated the use of liquefied pig manure as an alternative to urea fertilizer in conventional agriculture. Results showed a more than two-fold reduction in nitrous oxide emissions in pepper cultivation areas with liquefied pig manure compared to that with urea fertilizer. The population of Nitrosospira, a nitrous oxide-producing bacterium, decreased by over 10% with liquefied pig manure. Additionally, nirK and nosZ, which are related to the denitrification process, significantly increased in the urea fertilizer group, whereas levels in the liquefied pig manure group resembled those with no nitrogen treatment. In conclusion, the experiment confirmed that liquefied pig manure can serve as an eco-friendly nitrogen fertilizer, significantly reducing nitrous oxide production, a major contributor to the atmospheric greenhouse effect.

Impact of Energy Consumption, FDI and Trade Openness on Carbon Emissions in lvory Coast

  • Ange Aurore KADI;Liang LI;David Dauda LANSANA;Joseph FUSEINI
    • Asian Journal of Business Environment
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    • v.14 no.3
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    • pp.23-35
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    • 2024
  • Purpose: The study focuses on the impact of Foreign Direct Investment (FDI), trade openness, and energy consumption on carbon dioxide emissions in the Ivory Coast. It aims to quantitatively evaluate the effects of FDI, energy consumption, and trade openness on CO2 emissions in Ivory Coast. Research design, data, and methodology: The research uses an econometric framework and the Autoregressive Distributed Lag (ARDL) model to analyze time-series data from 1980 to 2021 between these factors. Results: The analysis revealed that FDI significantly impacts the carbon dioxide emissions, FDI showed a negative impact on carbon emissions in the long-run equilibrium term. Also, energy consumption impacted CO2 emissions in the long-run equilibrium term. Conclusion: To mitigate the upsurge of CO2 emissions in the Ivorian context, concrete policy, including enactment and adherence to strict environmental regulations, adoption and prioritization of eco-friendly products and technologies, and investment in renewable energy infrastructure are recommended. The study contributes to the global discussion on sustainable development by offering a model for similar assessments in other emerging nations facing simultaneous economic growth and environmental conservation challenges.