• 제목/요약/키워드: Global Change

검색결과 2,945건 처리시간 0.029초

The Numerical Prediction of the Micro Climate Change by a Residential Development Region

  • Oh, Eun-Joo;Lee, Hwa Woon;Kondo, Akira;Kaga, Akikazu;Yamaguchi, Katsuhito
    • 한국환경과학회지
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    • 제12권5호
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    • pp.529-539
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    • 2003
  • We developed a numerical model that considered the influences on the thermal environment of vegetation, water surfaces and buildings to predict micro climatic changes in a few $\textrm{km}^2$ scales; and applied this model to the Mino residential development region in Osaka Prefecture by using a nested technique. The calculated temperatures and winds in the residential development region reasonably agreed with the observed ones. We then investigated the influences on the thermal environment of the construction of a dam, the change of the green coverage rate. The results obtained from the numerical simulations were qualitatively reasonable.

Effects of US Monetary Policy on Gross Capital Flows: Cases in Korea

  • CHOI, WOO JIN
    • KDI Journal of Economic Policy
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    • 제42권4호
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    • pp.59-90
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    • 2020
  • U.S. monetary policy has been claimed to generate global spillover and to destabilize other small open economies. We analyze the effects of certain identified U.S. monetary shocks on gross capital flows in the Korean economy using the local projection method. Consistent with previous results on other small open economies, we initially confirm that U.S. interest rate hikes are dynamically correlated with foreign outflows and residents' inflows. That is, not only are they correlated with withdrawals by foreigners but they are also correlated with those by domestic (Korean) investors. The results are mostly driven by portfolio flows. Second, however, the marginal response to a U.S. monetary policy shock is, on average, subdued if we focus on the sample periods after the Global financial crisis of 2007-2008 (henceforth, global financial crisis). We conjecture a possible reason behind the change, an institutional change related to financial friction. If the degree of pledgeability of the value of net worth increases, the marginal responses by both investors would drop with a U.S. monetary policy shock, consistent with our findings.

중학교 과학과 기후변화 교육 프로그램 개발과 적용 (Development and Application of Climate Change Education Program in Middle School Science)

  • 우정애;남영숙
    • 한국과학교육학회지
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    • 제32권5호
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    • pp.938-953
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    • 2012
  • 이 연구의 목적은 중학생들의 기후변화에 대한 이해 증진과 미래의 기후변화에 대한 예측을 통해 기후변화에 대응하고 실천할 수 있는 능력을 길러 주기 위한 중학교 과학과 기후변화 교육 프로그램을 개발하고 적용하여 그 효과를 분석하는 것이다. 이 연구의 결과는 다음과 같다. 첫째, 중학교 과학과 교과시간을 위한 기후변화 교육 프로그램이 개발되었다. 중학교 과학과 기후변화 교육 프로그램은 8개의 주제가 기후변화의 현상과 원인, 영향 및 대응방안 등의 교육내용을 중심으로 중학교 교과 교육과정에 활용될 수 있도록 개발되었으며, 기후변화가 가지는 지구시스템 과학 교육의 특성과 지속가능 발전 교육의 통합적인 특성을 반영하도록 개발하였다. 둘째, 개발된 중학교 과학과 기후변화 교육 프로그램을 적용하여 효과를 분석하였다. 효과를 분석해 본 결과, 중학교 과학과 기후변화 교육프로그램은 학생들의 기후변화에 대한 지식 이해 수준 및 기후변화에 대한 인식 및 태도, 실천의지의 향상에 기여했음을 보여주었다.

Multiple Structural Change-Point Estimation in Linear Regression Models

  • Kim, Jae-Hee
    • Communications for Statistical Applications and Methods
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    • 제19권3호
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    • pp.423-432
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    • 2012
  • This paper is concerned with the detection of multiple change-points in linear regression models. The proposed procedure relies on the local estimation for global change-point estimation. We propose a multiple change-point estimator based on the local least squares estimators for the regression coefficients and the split measure when the number of change-points is unknown. Its statistical properties are shown and its performance is assessed by simulations and real data applications.

Analysis of Changes in Extreme Weather Events Using Extreme Indices

  • Kim, Byung-Sik;Yoon, Young-Han;Lee, Hyun-Dong
    • Environmental Engineering Research
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    • 제16권3호
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    • pp.175-183
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    • 2011
  • The climate of the $21^{st}$ century is likely to be significantly different from that of the 20th century because of human-induced climate change. An extreme weather event is defined as a climate phenomenon that has not been observed for the past 30 years and that may have occurred by climate change and climate variability. The abnormal climate change can induce natural disasters such as floods, droughts, typhoons, heavy snow, etc. How will the frequency and intensity of extreme weather events be affected by the global warming change in the $21^{st}$ century? This could be a quite interesting matter of concern to the hydrologists who will forecast the extreme weather events for preventing future natural disasters. In this study, we establish the extreme indices and analyze the trend of extreme weather events using extreme indices estimated from the observed data of 66 stations controlled by the Korea Meteorological Administration (KMA) in Korea. These analyses showed that spatially coherent and statistically significant changes in the extreme events of temperature and rainfall have occurred. Under the global climate change, Korea, unlike in the past, is now being affected by extreme weather events such as heavy rain and abnormal temperatures in addition to changes in climate phenomena.

Consequences and Remediation of Climate change with Focus on Clean Water and Sanitation in India

  • Khan, Mohammad Danish;Lee, Seungmin;Ahn, Ji Whan
    • 에너지공학
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    • 제27권1호
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    • pp.65-75
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    • 2018
  • The emission of greenhouse gases mainly carbon dioxide and methane is the result of rapid industrialization to meet the demands of ever-growing population. This has resulted in an increase of global temperature which in turn is responsible for severe environmental, social, ecological and economic losses, commonly known as to as 'climate change'. This study attempts to highlight the impacts of climate change mainly focussing on water contamination, sanitation and open defecation in India. The requirement for the instantaneous employment of environment friendly technologies along with improved sanitary system has been discussed. Various other issues which are also linked to climate change that need further management like managing water resources, deterioration in human health, economic losses, modification and successful implementation of policies have been pointed out. Furthermore, stress has been made for the urgent adaptation and rethinking for making strategies along with the involvement of women in order to cop up challenges offered by climate change.

Towards Sustainability of Tropical Forests: Implications for Enhanced Carbon Stock and Climate Change Mitigation

  • Rahman, Mizanur;Islam, Mahmuda;Islam, Rofiqul;Sobuj, Norul Alam
    • Journal of Forest and Environmental Science
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    • 제33권4호
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    • pp.281-294
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    • 2017
  • Tropical forests constitute almost half of the global forest cover, account for 35% of the global net primary productivity and thereby have potential to contribute substantially to sequester atmospheric $CO_2$ and offset climate change impact. However, deforestation and degradation lead by unsustainable management of tropical forests contribute to the unprecedented species losses and limit ecosystem services including carbon sequestration. Sustainable forest management (SFM) in the tropics may tackle and rectify such deleterious impacts of anthropogenic disturbances and climatic changes. However, the existing dilemma on the definition of SFM and lack of understanding of how tropical forest sustainability can be achieved lead to increasing debate on whether climate change mitigation initiatives would be successful. We reviewed the available literature with a view to clarify the concept of sustainability and provide with a framework towards the sustainability of tropical forests for enhanced carbon stock and climate change mitigation. We argue that along with securing forest tenure and thereby reducing deforestation, application of reduced impact logging (RIL) and appropriate silvicultural system can enhance tropical forest carbon stock and help mitigate climate change.

주거용 건물부문 태양열 기술 보급에 따른 누적 온실가스 감축 효과 분석 (Cumulative GHG Reduction Impact Analysis by the Diffusion of Solar Thermal Energy Concerning Technologies for the Residential Sector)

  • 이동은;김승진;전의찬
    • 한국기후변화학회지
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    • 제5권3호
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    • pp.267-275
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    • 2014
  • A key driver for climate change caused by global average temperature rise is greenhouse gas cumulative emissions that stay for long term in the atmosphere. Although at the moment there is no GHG emission, global warming will continue owing to GHG cumulative emission. In this study, scenarios are developed based on two types of optimistic and conservative diffusion goal. There were a total of 6 alternatives scenarios. The objective of this study are to compare scenarios in terms of GHG cumulative emissions and alternative fuels. An object of analysis is the residential buildings and time frame of scenarios is set up by 2030. And this study uses the LEAP model that is a bottom-up energy model. In conclusion, It is important to set specific diffusion pathway for mitigating climate change virtually.

Environment Change of Marine Transportation and Inter-related Development of Shipping and Shipbuilding Industries in Korea

  • Lee, Jin-Tae;Lim, Chin-Soo;Kim, Tae-Il;Koh, Chang-Doo
    • Journal of Ship and Ocean Technology
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    • 제11권2호
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    • pp.34-45
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    • 2007
  • Environment of marine transportation market is changing rapidly. Due to globalization of world economy, marine transportation of cargos, especially trade using container boxes, is increasing dramatically. Fierce competition in the global market of container transportation forces the shipping industry to seek the economy of scale to reduce transportation cost, and drives the merge and alliance of liner shipping companies. Mega-sized container ships, having capacity over 10,000 TEU, were introduced, and appeared recently, in order to reduce the unit transportation cost. Korean shipping and shipbuilding companies are competitive, and have considerable market share in the global market. Even though both industries are inter-connected through ships and have many common interests in order to enlarge the global market share, inter-relation between two industries is surprisingly insignificant. In this paper current issues in the process of environmental change of marine cargo transportation are reviewed, and inter-relation of shipping and shipbuilding industries is discussed. Suggestions for inter-related development of Korean shipping and shipbuilding industries are given, and means for mutually beneficial collaboration are suggested.

기후변화에 따른 우리나라 미선나무의 분포변화 예측 (Projection of climate change effects on the potential distribution of Abeliophyllum distichum in Korea)

  • 이상혁;최재용;이유미
    • 농업과학연구
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    • 제38권2호
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    • pp.219-225
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    • 2011
  • Changes in biota, species distribution range shift and catastrophic climate influence due to recent global warming have been observed during the last century. Since global warming affects various sectors, such as agriculture and vegetation, it is important to predict more accurate impact of future climate change. The purpose of this study is to examine the observed distribution of Abeliophyllum distichum in the Korean peninsula. For this purpose, two period (present and future) climate data were used. Mean data between 1950 and 2000, were used as the present value and the year 2050 and 2080 data from A1B senario in IPCC SRES were used for the future value. Potential habitation is analyzed by MaxEnt(Maximum Entropy model), and Abeliophyllum distichum's coordinates data were used as a dependent variable and independent variables are composed of environmental data such as BioClim, altitude, aspect and slope. The result of six types GCM mean calculation, the potential habitability decreased by 40-60% of the average existing distribution. The methodogies and results of this research can be applicable to the climate changing adaptation stratiegies for the biodiversity conservation.