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임한철(Han-Cheol Lim),변영화(Young-Hwa Byun),권원태(Won-Tae Kwon),전종갑(Jong-Ghap Jhun) 한국기상학회 2008 대기 Vol.18 No.1
This study provides an impact assessment of climate change on energy consumption, based on ‘active-deal scenario'. This approach assumes that the amount of electric energy consumption depends on human spontaneous acts against local temperature change. In this study, a statistical model for estimation of the Residential Electric Energy Consumption (REEC) has been developed by using monthly mean temperature and monthly amount of electric energy consumption in the 6 major cities over the 1999-2005 period. The statistical model is utilized to estimate the past and future REEC, and to assess the economic benefits and damage in energy consumption sector. For an estimation of the future REEC, climate change scenario, which is generated by National Institute of Meteorological Research, is utilized in this study. According to the model, it is estimated that over the standard period (1999~2005), there might be economic benefits of about 31 billion Won/year in Seoul due to increasing temperature than in the 1980s. The REEC is also predicted to be gradually reduced across the Korean peninsula since the 2020s. These results suggest that Korea will gain economic benefits in the REEC sector during the 21st century as temperature increases under global warming scenarios.
마이크로 홀의 EDM 가공 시 생산성 향상을 위한 가공공정의 최적화
권원태(Won Tae Kwon),김영추(Yeong Chu Kim) 한국생산제조학회 2012 한국생산제조학회지 Vol.21 No.4
Micro electrical discharge machining (μEDM) has been used for non-conventional material removal. One drawback of μEDM is low productivity. In this study, we tried to find the optimal machining conditions to manufacture the micro hole with an optimal machining time without loss of accuracy. Taguchi method was used to figure out the relation between machining parameters and characteristics of the process. It was found that the electrode wear, the entrance and exit clearance gave a significant effect on the diameter of the micro hole when the diameter of the electrode was identical. Grey relational analysis was used to determine the optimal machining condition for minimum machining time without loss of accuracy. The obtained optimal machining condition was the input voltage of 80V, the capacitance of 680pF, the resistance of 500Ω, the feed rate of 1.5μm/s and the spindle speed of 2900rpm. The machining time was reduced to 48% without loss of accuracy under the optimal machining condition.
권원태(Won-Tae Kwon),백희정(Hee-Jeong Baek),최경철(Kyung-Cheol Choi),정효상(Hyo-Sang Chung) 한국기상학회 2005 대기 Vol.15 No.4
The global mean surface temperature has already increased by 0.6±0.2oC over the last century, and warming in Korea is approximately twice as large as the global average. The Intergovernmental Panel on Climate Change (IPCC) has concluded that the majority of warming over the past 50 years could be attributed to human activities (IPCC, 2001a). In addition, the global surface temperature is expected to increase by 1.4 to 5.8oC depending on the greenhouse gas emission scenarios during the 21st century.Climate change resulting from increased greenhouse gas concentrations has the potential to harm societies and ecosystems. Reductions in emissions of greenhouse gases and their concentration in the atmosphere will reduce the degree and likelihood of significant adverse conditions due to the anticipated climate change. Mitigation policy has generally been the primary focus of public attention and policy efforts on climate change. However, some degree of climate change is inevitable due to the combination of continued increases in emissions and the inertia of the global climate system. Adaptation actions and strategies are needed for a complementary approach to mitigation. The United Nations Framework Convention on Climate Change (UNFCCC) currently addresses vulnerability and adaptation in the context of climate change negotiations and in future adaptation may be an important element of work under the Kyoto Protocol. There are several on-going programs to develop effective adaptation strategies and their implementation. But in general, many other countries are still on an initiating stage. The climate change science programs of the United States, Japan, England, and Germany are initiated to understand the current status of climate change science and adaptation researches in the developed countries. In this study, we propose the improvement on systems in policy and research aspects to effectively perform the necessary functions for development of nation-wide adaptation measures and their implementation. In policy aspect, the Korean Panel on Climate Change (KPCC) is introduced as a coordinating mechanism between government organizations related with climate change science, impact assessment and adaptation. Also in research aspect, there is a strong consensus on the need for construction of a national network on climate change research as trans-disciplinary research network.