• Journal of Digital Convergence
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• v.10 no.2
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• pp.47-53
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• 2012

Economic crisis, efforts to overcome the digital content industry development at home and abroad have been racing in the country's future lies in the digital content industry. Therefore, the digital content industry through vision, model identification knowledge-based global digital content market-based deployment is required. For research purposes the digital content industry to derive an alternative to national industrial development that will lay the groundwork. The deployment order for the first digital content industry, SWOT analysis performed to derive the Korean-specific model. As a result, measures based on the advancement of digital content industry as a long-term vision and specific goals are presented as staged. The age of convergence of the u-media content markets in government, corporations, consumers, and these form the structure of a virtuous cycle distribution systems for energy by being active, synergistic effects are obtained. Above all, based on the content industry to secure internal and external growth is key. Vision of the digital content, the growth momentum of the national social development policies to be used as a role model by changing the way a series of courses is required.

• Proceedings of the KSCN Conference
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• 2005.10a
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• pp.20-32
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• 2005

With the prosperous economy, the status of diet and nutrition among the urban and rural Chinese population has been improved significantly. This paper will focuses on three main surveys in China. (1)'Food and Nutrition Surveillance System in China': Phase I focused on analysis of previous data. Phase II was a pilot survey initiated in Beijing, Hebei, Heilongjiang, Ningxia, Zhejiang, Guangzhou, and Sichuan in 1990. (2) 'The China Health and Nutrition Survey' is an ongoing longitudinal project covered 8(9) provinces in 1991,1993,1997,2000. This paper will analysis the adults aged 18 45 of 1991, 1993, 1997, and 2000. (3) Survey on the status of nutrition and health of the Chinese (2002) is an across sectional study covered 31 provinces, autonomous region and the municipalities. The data was used to analyze the status of food consumption and dietary nutrients intake of Chinese population. In the past ten years, the prevalence of malnutrition and nutrition deficiency has been continuously decreased. The consumptions of animal products, milk, and edible oil have been increased, while the dairy and legume products consumption decreased. The unbalance was showed with a downward trend in cereals, vegetables and fruits consumption and a significant increase in animal products and oil intake among urban people. Dietary pattern of some subjects went away to 'high energy density' diet. The deficiency of calcium, retinal and ascorbic acid etc, especially in the rural areas still exist. China is undergoing a remarkable, but undesirable, rapid transition towards a stage of the nutrition transition characterized by high rates of DR NCDs in a very short time. China is facing the dual challenges of nutrition deficiency and nutrition imbalance. The results can help to understand the dietary structure and the status of nutrition among Chinese people over the past years. It will provide the basis for formulating relevant state policies.

• Tunnel and Underground Space
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• v.22 no.3
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• pp.221-225
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• 2012

Magnesium is one of the light weight materials, which can improve fuel economy and reduce emissions in automotive industry. Recently, magnesium alloys have gained considerable attention due to good mechanical properties. In this work, we have performed an explosive welding using the magnesium alloys (AZ31) and stainless steel (SUS 304). As a result, SUS304/AZ31 were successfully combined each other; however, a resolidified interlayer was observed at the point of welded layer. To reduce the resolidified interlayer, we have changed the thickness (0.5 mm and 1 mm) of stainless steel, distance (45 mm and 60 mm) between explosive and the center of materials and initial angle ($20^{\circ}$ and $30^{\circ}$) of explosive. In the case of the thickness 0.5 mm and angle of $30^{\circ}$, the resolidfied interlayer was not observed due to the increase of distance from the explosive. To accurately estimate the resolidified interlayer, electron probe micro-analyzer (EPMA) method and hardness were used. For the EPMA analysis, mixed materials were confirmed at the resolidified interlayer, and the measurement exhibited the middle value compared with the AZ31 and SUS304.

• Journal of Korea Water Resources Association
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• v.50 no.7
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• pp.467-473
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• 2017

Recently as algae phenomenon has been intensified, the need for additional dam flushing has been raised. To establish the more rational policies concerning the dam flushing, it is necessary to evaluate the dam flushing. This paper attempts to examine households' willingness to pay (WTP) for dam flushing by using a contingent valuation (CV). Especially, unlike other CV studies which used maximum likelihood estimation (MLE), this study employed Bayesian approach. This study surveyed a randomly selected sample of 1,000 households nation-widely, and asked respondents questions in person-to-person interviews about how they would be willing to pay for the additional dam flushing. Respondents overall accepted the contingent market and were willing to contribute a significant amount (1,909.4 won), on average, per household per year. The aggregate value amounts to approximately 35.7 billion won per year.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.759-762
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• 2007

본 연구는 부문별 수소 및 연료전지의 수요량을 산정하고 원활한 수소공급을 위한 수소제조원의 최적믹스를 바탕으로 수소 도입 이후의 에너지믹스를 제시하는 것을 목표로 하고 있다. BaU 전망은 에너지경제연구원의 전망을 바탕으로 하였으며 기준안, 고유가안, 저유가안의 세가지 시나리오를 설정하여 각 시나리오별 분석을 수행하였다. 기준안에 따르면 수소 및 연료전지는 2015년 시장에 도입되어 2031년 5%의 시장보급률을 확보한 이후 보급률이 급격히 증가하는 것으로 나타났다. 수소 연료전지 시장중 특히 수송부문이 선도적 역할을 할 것으로 기대되며 FCV 보급대수는 2040년 1,132만대로 전체 자동차 시장의 48.4%를 차지할 전망이다. 최종에너지 중 수소의 비중은 2040년 8.7%에 이를 것으로 예측되며 수소의 도입으로 인해 1차에너지 중 신${\cdot}$재생에너지 비중이 BaU 대비 약 5.1%p 증가한 12.1%에 이를 것으로 분석되었다. 총 수소수요량은 777만톤에 이를 전망이다. 고유가안에서는 수소 및 연료전지가 2012년에 시장에 도입되는 것으로 가정하였으며 2040년 FCV 보급대수는 1,633만대에 이를 전망이다. 최종에너지 중 수소 비중은 11.5%에 이를 것으로 예상되며 1차에너지 신${\cdot}$재생에너지 비중은 11.6%로 분석되었다. 수소수요량은 1,015만톤으로 전망된다. 저유가안에서는 수소 및 연료전지가 2018년 도입되는 것으로 가정 하였다. 이 경우 2040년 FCV는 641만대가 보급되어 자동차 등록대수의 27.4%를 차지할 것으로 전망된다. 최종에너지 중 수소 비중과 1차에너지중 신${\cdot}$재생에너지 비중은 각각 5.5%, 9.1%에 이를 것으로 분석되었으며 수소수요량은 496만톤으로 전망된다.

• Journal of the Korea Organic Resources Recycling Association
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• v.22 no.1
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• pp.35-39
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• 2014

The world has been interested in sustainable development and to be considered important the three values(Environmental Integrity, Economic Growth, Social expandability) of sustainability. Rio+20 conference was attention to "Green Economy", trying to solve for sustainable development. But Rio+20 proposed "The Future We Want", They can't solve it and it is regret. Also It is judged that Only three values of sustainability are limited to sustainable development. Five values; Green Star is suggested the answer for "The Future We Want". Four Rivers Project verified by Green Star, Green Star proposed new paradigm for sustainable development. And Expect the strong well-being country of Korea.

• Resources Recycling
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• v.24 no.3
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• pp.66-75
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• 2015

The flexural performance of amorphous steel fibers having environmental and economy benefits due to relatively short manufacturing process were evaluated as well as that of hooked steel fibers by varing fiber length and volume fraction. Fiber lengths were 10 mm, 20 mm, 30 mm and fiber volume fractions were varied from 0.3% to 1.2%. Test results with flexural performance showed that mixing design needs to be careful because of relatively high volume of amorphous steel fiber compared to hooked steel fibers. High flexural strength was obtained from both longer fiber length and higher volume fraction. Residual strength and toughness of amorphous steel fiber were similar to that of hooked steel fiber, even though rapid dropping of applied load right after concrete matrix breaking. It can be judged that relatively high ability of energy dissipation around first cracking area relatively overcome rapid dropping of loading.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.15 no.5
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• pp.207-212
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• 2015

Continuous, high-quality supply of electrical energy is the backbone of any modern economy. Any equipment operating at a power station must be reliable and safe. All major power supply components such as transformers, cables, generators, and switchgear need to be kept in perfect operating condition. The lifetime of power cables, used as the main means of transferring electric power, is understood to be about 30 years, from the time of manufacturing. The dielectrics between two conductors of a cable must be able to withstand electrical stresses from high-voltage input. This condition should be verified throughout the lifetime of the cable system. Several techniques, such as VLF-tan${\delta}$, partial discharge, and insulation resistance are used in order to determine the operating conditions of cables. In this paper, we present our work on insulation resistance to diagnose cables in operation at the Western Power station in Taean, Chungcheong Namdo Province, South Korea. As a result we have found cables the life time of which is 38 years.

• 유체기계공업학회:학술대회논문집
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• 2001.11a
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• pp.159-164
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• 2001

An extensive range of pumping facilities are employed in the regional water supply system in metropolitan areas, and optimization and the systematic combination of the pump facilities have direct bearing on the stability and economy of the water supply system concerned. These systems must be able to guarantee stability, efficiency and offer high reliability. Preparation of metropolitan area regional water supply system construction project must include a basic plan which takes into account the suitability of pumping facilities to be used, the environment in which facilities will be installed, man-power requirements and basic operational and management policies. This paper contains over-all analysis of the management of metropolitan area regional water supply systems and highlights the cause of Inefficiency and energy waste and puts forward a remedial plan of action. In addition, pump/motor specification programs were developed using Visual Basic to assist selection of the same.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.21 no.8
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• pp.439-447
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• 2009

Cogeneration system produces power as well as heat recovered from waste heat during power generation process. This system has higher energy efficiency than that of the power plant. In this study the optimal design for the cogeneration system with the increase of the capacity considering life cycle cost(LCC) analysis has been performed in the general facilities such as hotels and hospitals under the assumption of electricity cost of 95 won/kWh, the initial cost of cogeneration system of 1,500,000 won!kW and the value of 0.5${\sim}$1.0 in the ratio of heat to power. The optimal ratio of cogeneration capacity divided by average electricity load of facility was found out more than 0.5 in case of electricity cost with the increase of>30%, and the percentage of $CO_2$ reduction was about 9%. The most important factors in the economic analysis of cogeneration system was found out the electrity cost and the initial cost of cogeneration system. Also the ratio of heat to power at the value of>0.5 was not affected in the economy of cogeneration system, but was very important in the $CO_2$ reduction.