• Title/Summary/Keyword: International environmental protection

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Development and Application of Dry Process Caisson for Maintenance of Submerged Barber Structure

  • Lee, Joong-Woo;Lee, Seung-Chul;Oh, Dong-Hoon;Kwak, Seung-Kyu;Lee, Jeong-Su
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2006.10a
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    • pp.105-114
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    • 2006
  • Together with the trend of enhancement in domestic industrial development and economic progress due to import and export, the demand for construction of the roads, bridges, especially port facilities, and several coastal protection and ocean structures is increasing rapidly. MOMAF of Korean Government is driving construction of 9 new ports and renovation of the existing fishery ports. Among these structures most of bridge base, wharves, dolphins, quays, and jetties are being newly built of steel or concrete pile. As the base, supporting bulkheads, and piles are underwater after construction, it is difficult to figure out the status of structures and not enough to get maintenance and strengthen the structures. Every year, moreover, these works suck the government budget due to higher incomplete maintenance expense for protection from corrosions of structures and increased underwater construction period. for the purpose of cutting down the government budget, it is necessary to extend the life cycle of the existing structures. We developed a new method for maintenance of submerged structures near the waterline by allowing dry work environment with the floating caisson. The method shows easy to move around the working area and handle. It also showed not only a significant reduction of maintenance expenses and time for anti-corrosion work but also better protection. This will be a milestone to reduce the maintenance and construction expenses for the shore and water structures.

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A Study on Prediction of Sediment and Riverbed Variation According to Sediment Transportation Functions (유사량 산정공식에 따른 유사 및 하상변동 예측에 관한 연구)

  • Go, Su Hyeon;Song, In Ryeol;Kim, Chang Seok
    • Journal of Environmental Science International
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    • v.13 no.3
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    • pp.263-277
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    • 2004
  • The purpose of this study is to analyze the characteristics of riverbed variation due to the sediment protection weir located on the estuary of the main stream of Taehwa river using I-D finite difference model, HEC-6 model, and the followings are the results of estimating sediment transport rate, amount of scour or deposition, and accumulated amount of deposit according to before and after of the sediment protection weir removal with various flow rates in the channel. Ackers-White transport function produced the greatest sediment transport rate while Meyer-Peter showed the smallest sediment transport rate at the most down stream area of the watershed through the sediment transport rate analyses for various flow rates according to the existence or nonexistence of the sediment protection weir. Toffaleti's and Colby transport function were closest to the average value, and the difference among the results of the sediment transport functions showed up to 8~9 times. Duboy's transport function produced the greatest riverbed variation while Toffaleti's showed the smallest variation through the riverbed variation analyses according to the existence or nonexistence of the sediment protection weir. Yang's was closest to the average value, and the difference among the results of the riverbed variation analyses ranged from 1.4 times to 11 times. It is thought that a sediment transport function must be selected very carefully with respect to the criteria of sediment yield estimation because the analysis results of the sediment transport rate and riverbed variation according to flow rates showed significant differences among the sediment transport functions, and the differences of sediment transport rate and riverbed variation according to the various sediment transport functions decreased as the flow rate increased.

Analysis of Production Process Improvement with Life Cycle Assessment $Technology{\sim}$ Example of HDPE Pipe Manufacturing

  • Tien, Shiaw-Wen;Chiu, Chung-Ching;Chung, Yi-Chan;Tsai, Chih-Hung;Chang, Chin-Fa
    • International Journal of Quality Innovation
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    • v.8 no.2
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    • pp.32-56
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    • 2007
  • Life Cycle Assessment (LCA) aims to analyze possible impact upon manufacturing process and availability of products, and also study the environmental considerations and potential influence during entire life cycle ranging from procurement, production and utilization to treatment (namely, from cradle to tomb). Based on high-density polyethylene (HDPE) pipe manufacturing of company A, this case study would involve evaluation of environmental influence during the production process. When the manufacturing process has been improved during "production process" and "forming cooling" stage, it is found that capital input on "electric power" and "water supply" could be reduced, thus helping to sharpen the competitive power of company A, and also ensure sustainable economic and industrial development in accordance with national policies on environmental protection.

An Adaptive Reclosing Algorithm Considering Distributed Generation

  • Seo, Hun-Chul;Kim, Chul-Hwan
    • International Journal of Control, Automation, and Systems
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    • v.6 no.5
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    • pp.651-659
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    • 2008
  • Autoreclosing techniques have been used in power systems to maintain system stability and continuity of supply. Environmental and economical issues have driven significant increases in the development of distributed generation (DG). DG connected to distribution systems, however, may impose negative influences with respect to power quality, protection, and stability, because DG can cause some challenges to protection, especially to reclosing. For this reason, in order to improve the reliability and safety of the distribution system, the rules and guidelines suggest that the DG system needs to be rapidly disconnected from the system before reclosing. We present, in this paper, an adaptive reclosing algorithm considering the DG. The algorithm consists of an angle oscillation's judgment, the emergency extended equal-area criterion (EEEAC), the calculation of an optimal reclosing time, and a reconnection algorithm. Our simulation results for three different DG technologies with Electromagnetic Transient Program (EMTP) indicate that we can maintain transient stability while the DG is protected against disturbances.

Field Application Study for Soil Improvement and Existing Foundation Protection Work by Hi-FA(High performance and Multi functional Agent) (Hi-FA(유동성 및 점성 개질제)를 이용한 지반보강 및 기존 교량기초 보강공법에 대한 실용화 연구)

  • Kim, Myung-Hak;Park, Myoung-Deuk;Yoon, Tae-Gook;Lee, Yong-Jun;Park, Min-Cheol
    • Proceedings of the Korean Geotechical Society Conference
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    • 2010.09a
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    • pp.664-675
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    • 2010
  • Recently environment-friendly construction method is major trend in both domestic and world constrction fields. In this paper High Functional Performance Agent(Hi-FA) which has various improved engineering characteristics different with conventional Portland cement grouting, such as high viscosity, liquidity, void filling ability, early hardening, and separation resistance, was analyzed by field and laboratory test. Also soil improvement and existing deep foundation protection works were performed and analyzed using Hi-FA.

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Chronic Effect Exposed to Carbon Dioxide in Benthic Environment with Marine Invertebrates Copepod(Tisbe sp.) and Amphipod(Monocorophium acherusicum) (저서환경에서 이산화탄소 노출에 따른 국내산 해산무척추동물 요각류(Tisbe sp.)와 단각류(Monocorophium acherusicum)의 만성영향)

  • Moon, Seong-Dae;Choi, Tae Seob;Sung, Chan-Gyoung;Lee, Jung-Suk;Park, Young-Gyu;Kang, Seong-Gil
    • Journal of Environmental Science International
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    • v.22 no.3
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    • pp.359-369
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    • 2013
  • Chronic effects such as reproduction and population dynamics with elevated $CO_2$ concentration were evaluated using two representative marine benthic species, copepod (Tisbe sp.) and amphipod (Monocorophium acherusicum) adopting long-term exposure. Juvenile copepod and amphipod individuals were cultivated in the seawater equilibrated with control air (0.395 mmol $CO_2$/air mol) and high $CO_2$ air having 0.998, to 3.03, 10.3, and 30.1 mmol $CO_2$/air mol during 20 and 46 days, respectively. After the exposure period, the number of benthic invertebrate was counted with separate larval and juvenile stage such as naupliar, copepodid and adult for copepod, or neonate and adult for amphipod, respectively. The individual number of both test species at each life-stage was significantly decreased in seawater with 10.3 mmol $CO_2$/air mol or higher. Recently, the technology of marine $CO_2$ sequestration has been developed for the reduction of $CO_2$ emission, which may cause climate change. However, under various scenarios of $CO_2$ leaks during the injection process or sequestrated $CO_2$ in marine geological structure, the potential risk to organism including various invertebrates can be expected to exposure. So the results of this study suggested that the detailed consideration on the adverse effect with marine ecosystem can be prerequisite for the marine $CO_2$ sequestration projects.

How to Reflect Sustainable Development in Overseas Investment including Equator Principles (해외투자(海外投資)와 지속가능발전 원칙 - 적도원칙(赤道原則)(Equator Principles)을 중심으로 -)

  • Park, Whon-Il
    • 한국무역상무학회:학술대회논문집
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    • 2006.06a
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    • pp.45-72
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    • 2006
  • The Equator Principles are a set of voluntary environmental and social guidelines for ethical project finance. These principles commit banks and other signatories to not finance projects that fail to meet these guidelines. The principles were conceived in 2002 on an initiative of the International Finance Corporation and launched in 2003. Since then, dozens of major banks have adopted the Principles, and with these banks among them accounting for more than three quarters of all project loan market volume the Principles have become the de facto standard for all banks and investors on how to deal with potential social and environmental effects of projects to be financed. While regarding the Principles an important initiative, NGOs have criticised the Principles for not producing real changes in financing activities and for allowing projects to go through that should have been screened out by the Principles, such as the Sakhalin-II oil and gas project in Russia. In early 2006, a process of revision of the principles was begun. The Equator Principles state that endorsing banks will only provide loans directly to projects under the following circumstances: - The risk of the project is categorized in accordance with internal guidelines based upon the environmental and social screening criteria of the International Finance Corporation (IFC). - For all medium or high risk projects (Category A and B projects), sponsors complete an Environmental Assessment, the preparation of which must meet certain requirements and satisfactorily address key environmental and social issues. - The Environmental Assessment report addresses baseline environmental and social conditions, requirements under host country laws and regulations, applicable international treaties and agreements, sustainable development and use of renewable natural resources, protection of human health, cultural properties, and biodiversity, including endangered species and sensitive ecosystems, use of dangerous substances, major hazards, occupational health and safety, fire prevention and life safety, socio-economic impacts, land acquisition and land use, involuntary resettlement, impacts on indigenous peoples and communities, cumulative impacts of existing projects, the proposed project, and anticipated future projects, participation of affected parties in the design, review and implementation of the project, consideration of feasible environmentally and socially preferable alternatives, efficient production, delivery and use of energy, pollution prevention and waste minimization, pollution controls (liquid effluents and air emissions) and solid and chemical waste management. - Based on the Environmental Assessment, Equator banks then make agreements with their clients on how they mitigate, monitor and manage those risks through an 'Environmental Management Plan'. Compliance with the plan is required in the covenant. If the borrower doesn't comply with the agreed terms, the bank will take corrective action, which if unsuccessful, could ultimately result in the bank canceling the loan and demanding immediate repayment. - For risky projects, the borrower consults with stakeholders (NGO's and project affected groups) and provides them with information on the risks of the project. - If necessary, an expert is consulted. The Principles only apply to projects over 50 million US dollars, which, according to the Equator Principles website, represent 97% of the total market. In early 2006, the financial institutions behind the Principles launched stakeholder consultations and negotiations aimed at revising the principles. The draft revised principles were met with criticism from NGO stakeholders, who in a joint position paper argued that the draft fails by ignoring the most serious critiques of the principles: a lack of consistent and rigorous implementation.

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Factors Related to Aldehydes Exposure and Symptoms in Residential Indoor Air (실내 환경 중 알데하이드 농도 분포 및 영향 요인 평가)

  • Yang, Ji-Yeon;Lee, Ji-Ho;Lim, Young-Wook;Park, Soung-Eun;Hong, Chein-Soo;Kim, Chang-Soo;Shin, Dong-Chun
    • Environmental Analysis Health and Toxicology
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    • v.22 no.1 s.56
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    • pp.37-47
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    • 2007
  • Aldehydes are irritants of the upper respiratory tract with symptoms such as eye, nose, and throat. Formaldehyde classified in Group 2A by the International Agency for Research on Cancer and a probable human carcinogen by the Unite States Environmental Protection Agency due to its carcinogenicity. Aldehydes may be emitted from many other consumer products, such as permanent press fabrics, cosmetics, fiberglass insulation, paints, and coatings. The purpose of this study was to examine the does-response relationship between aldehydes levels and symptoms (eyes, nose, throat, and respiratory) for 36 dwellings and 280 households in Korea. As a result, environmental factors affecting aldehydes level were indoor smoking, ventilation, using of carpet, bed, and new furniture, painting for renovation, and indoor humidity. There wat weakly positive correlation between symptom score and aldehydes level.

Development and strengthening of the nuclear and radiation safety infrastructure for nuclear power program of Bangladesh

  • Islam, Md. Shafiqul;Faisal, Shafiqul Islam;Khan, Sadia
    • Nuclear Engineering and Technology
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    • v.53 no.5
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    • pp.1705-1716
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    • 2021
  • Bangladesh, as a newcomer country, is expecting to start her nuclear power journey by 2022. Due to evident reasons, newcomer nuclear countries face several key challenges concerning the development of national nuclear safety infrastructure. The paper investigates the status of the 7 key safety infrastructure issues out of the 19 and readiness of the supportive organizations, laboratories, and workforces following the International Atomic energy Agency's status evaluation guide at milestone 3 and foreign countries' practice. Much progress has been achieved at phase 3 regarding the establishments of a few Acts, a regulator, and an operator. However, comprehensive regulatory frameworks, skilled workforces, establishments of a few supportive organizations, and laboratories for managing environmental radioactivity, radiological accidents, and radioactive wastes are yet to ready. Several suggestions are made for establishing and expediting radiation monitoring laboratories, a radiological emergency management center, a radioactive waste management company, and technical support organizations for the safety infrastructure. To avoid perceived risks, policymakers and competent authorities need to emphasize creating an optimized safety infrastructure before commissioning and operating the 1st nuclear power plant safely, securely, and cost-sustainably.

Effects of Participation in a Forest Therapy Program on the Ego-resiliency and Interpersonal Relationships of Children Requiring Protection (산림치유 프로그램 참여가 보호대상아동의 자아탄력성 및 대인관계에 미치는 영향)

  • Kang, Jaewoo;Kim, Hyeon-Ju
    • Journal of Environmental Science International
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    • v.31 no.1
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    • pp.51-59
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    • 2022
  • This study investigated the effects of participation in a forest therapy program on ego-resiliency and interpersonal relationships to strengthen the independent capabilities of children requiring protection. The participants were divided into two groups: the experimental group (n=87; age, 16.40±1.90 years) and control group (n=90; age, 16.97±1.39 years). The study was conducted from July to August 2020. The experimental group participated in a forest therapy program operated by the National Center for Forest Therapy, Yeongju, for 2 nights and 3 days, whereas the control group lived routine life. The participants' ego-resiliency and interpersonal relationships were tested at the beginning and end of the forest therapy program. In the experimental group, ego-resiliency was improved and interpersonal relationships were significantly altered. Therefore, forest therapy programs may serve as effective interventions that can positively affect the social adaptation and growth of protected children into healthy adults.