• 에너지공학
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• 제25권3호
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• pp.1-8
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• 2016

현재 북한은 국제사회와의 마찰로 인한 경제제재와 에너지 생산 감소로 산업생산력 저하라는 경제위기를 겪고 있다. 본 논문에서는 북한의 경제회복과 에너지산업 협력을 위해 필요한 천연가스산업과 석탄산업의 기술현황과 에너지 산업 투자 방안에 대해 분석하였고, 에너지 산업 투자가 남북한에 미치는 경제적 파급 효과를 계산 하였다. 북한의 경제적 파급효과를 분석하기 위하여 2014년도 산업연관표(북한)를 작성하였고, 투입-산출모형을 이용하였다. 천연가스산업과 석탄산업 투자의 파급효과는 각각 10.12억 달러, 27.42억 달러이다. 또한, 남한의 경제에 미치는 파급 효과를 분석하기 위해 2013년 산업연관표(남한)와 산업연관분석의 수요유도형 모형을 이용하였다. 천연가스 및 석탄 산업 투자의 생산유발효과, 부가가치유발효과, 취업유발효과는 각각 2.02073, 0.62697, 8.99409, 2.02130, 0.62701, 9.00413으로 계산되었다.

• 한국대기환경학회지
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• 제22권6호
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• pp.912-921
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• 2006

This study examines greenhouse gas reduction potentials in cement manufacturing industry of Korea. An energy system model in the MARKAL (MARKet ALlocation) modeling framework was used in order to identify appropriate energy technologies and to quantify their possible implications In terms of greenhouse gas reduction. The model is characterized as mathematical tool for the long term energy system analysis provides an useful informations on technical assessment. Four scenarios are developed that covers the ti me span from 2000 to 2020. Being technology as a fundamental driving factor of the evolution of energy systems, it is essential to study the basic mechanisms of technological change and its role in developing more efficient, productive and clean energy systems. For this reasons, the learning curves on technologies for greenhouse gas reduction is specially considered. The analysis in this study shows that it is not easy to mitigate greenhouse gas with low cost in cement manufacturing industry under the current cap and trade method of Kyoto protocol.

• Asian-Australasian Journal of Animal Sciences
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• 제28권8호
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• pp.1140-1149
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• 2015

This research aimed to define the energy requirement of Dorper and Hu Hybrid $F_1$ ewes 20 to 50 kg of body weight, furthermore to study energy requirement changes with age and evaluate the effect of age on energy requirement parameters. In comparative slaughter trial, thirty animals were divided into three dry matter intake treatments (ad libitum, n = 18; low restricted, n = 6; high restricted, n = 6), and were all slaughtered as baseline, intermediate, and final slaughter groups, to calculate body chemical components and energy retained. In digestibility trial, twelve ewes were housed in individual metabolic cages and randomly assigned to three feeding treatments in accordance with the design of a comparative slaughter trial, to evaluate dietary energetic values at different feed intake levels. The combined data indicated that, with increasing age, the net energy requirement for maintenance ($NE_m$) decreased from $260.62{\pm}13.21$ to $250.61{\pm}11.79kJ/kg^{0.75}$ of shrunk body weight (SBW)/d, and metabolizable energy requirement for maintenance (MEm) decreased from $401.99{\pm}20.31$ to $371.23{\pm}17.47kJ/kg^{0.75}$ of SBW/d. Partial efficiency of ME utilization for maintenance ($k_m$, 0.65 vs 0.68) and growth ($k_g$, 0.42 vs 0.41) did not differ (p>0.05) due to age; At the similar condition of average daily gain, net energy requirements for growth ($NE_g$) and metabolizable energy requirements for growth ($ME_g$) for ewes during late fattening period were 23% and 25% greater than corresponding values of ewes during early fattening period. In conclusion, the effect of age upon energy requirement parameters in the present study were similar in tendency with previous recommendations, values of energy requirement for growth ($NE_g$ and $ME_g$) for Dorper and Hu crossbred female lambs ranged between the NRC (2007) recommendation for early and later maturating growing sheep.

• 한국수자원학회논문집
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• 제45권12호
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• pp.1201-1211
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• 2012

본 논문은 순차적인 일국 CGE 모형을 구축하여 국가의 온실가스 저감정책과 연계한 물산업 지원 정책의 경제적 파급효과를 분석하였다. 모형은 물산업과 에너지 부문을 세분화하였으며, 온실가스 저감수단으로 탄소세를 도입하였다. 시나리오는 탄소세수를 가계에 이전하는 경우와 물산업에 지원되는 경우로 구축해 모의결과를 비교분석 하였다. 분석결과 물산업 지원 정책은 GDP 기준 약 0.1% 수준의 온실가스 저감 비용을 절감하고 소비와 투자를 확대하는데 기여하는 것으로 나타났다. 그러나 물산업의 에너지 집약도가 높기 때문에 탄소세 부과로 인한 에너지 대체, 비에너지 집약적 산업구조 전환에의 기여도는 미미하였다. 따라서 온실가스 저감정책 하에서 물산업 발전을 위해 에너지 효율개선, 친환경 에너지 개발 및 활용 증진 등 비용효율적인 물산업 정책 추진이 중요할 것이다.

• 방사선산업학회지
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• 제5권3호
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• pp.249-252
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• 2011

Lignin is one of the natural macromolecules. Every year large amount of lignin arises from the cellulose production as a by-product worldwide. The use of lignin as a precursor to carbonaceous materials has gained interest due to its low cost and high availability. Therefore, we improved the properties of alkali-lignin by exposing to gamma ray in this study. The alkali-lignin is irradiated by Gamma ray irradiation with varying doses. The char yields of alkali-lignin were investigated by increasing up to 50 kGy. The cross-linking and bond scission of alkali-lignin occur simultaneously during gamma ray irradiation. The crosslinking was predominantly accelerated by gamma ray irradiation up to 50 kGy. Bond scission predominantly occurs between 50 and 500 kGy. ESCA analysis indicated that the alcoholic carbon increase up to 50 kGy. Solution viscosity was increased as absorbed dose increased up to 20 kGy. In addition, the aromatic ring was not influenced by irradiation at doses ranging from 20 to 500 kGy as shown in FT-IR results.

• 방사선산업학회지
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• 제6권1호
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• pp.75-82
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• 2012

Swine wastewater was treated using a unique sequence of ion exchange membrane bed system (IEBR). Organic matter and nutrient in swine wastewater was pre-treated by electron beam irradiation. The optimal dose for solubilization of organic matter in swine wastewater ranged from 20 kGy to 75 kGy. The carbohydrates, proteins, and lipids were investigated as the solubilized organic fraction of swine wastewater and proteins and lipids mainly contained of the solubilized organic matter. The solubilization of organic matter in swine wastewater was affected by the combination effect of temperature and a dose. The average chemical oxygen demand (COD) removal efficiency under room temperature conditions was 67.1%, while that under psychrophilic conditions was 54.6%. For removal of ammonia, the removal efficiency decreased from 63.6% at $23^{\circ}C$ to 33.5% $16.8^{\circ}C$. On the other hand, the removal of phosphorus was not a function of temperature. Struvite was one of main mechanisms in anaerobic condition.

• 방사선산업학회지
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• 제6권1호
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• pp.61-65
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• 2012

Polyacrylonitrile (PAN) is one of the most widely used precursor polymers for making high performance carbon fibers. Conversion of PAN fibers to good quality carbon fibers requires an essential stabilization step prior to carbonization. Electron beam irradiation is an excellent technique for modifying the physical properties of materials. This study aimed to elucidate the effects of electron beam irradiation on the stabilization reactions of PAN nanofibers. FT-IR analysis indicated that the stabilization of irradiated PAN nanofibers was initiated at a lower temperature. The TG curve of PAN nanofibers showed a significant decrease of weight loss step between 280 and $320^{\circ}C$. In the case of irradiated PAN nanofibers, weight loss sudden weight did not loss occurs.

• 한국융합학회논문지
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• 제9권11호
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• pp.253-262
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• 2018

최근 에너지 산업은 에너지사용량 감축을 위해 신 재생에너지 공급정책을 시행하고 있다. 본 연구는 신 재생에너지 수요 증가에 대비하기 위한 지열에너지 시스템 공급 촉진에 도움이 될 수 있는 데이터베이스를 구축하고, 데이터베이스를 활용한 지열에너지 시스템 설치 가능성 평가 방법 개발을 목표로 한다. 연구에 사용한 데이터는 국가기관에서 제공하는 공공데이터를 사용하여 데이터의 신뢰성을 확보하였다. 지열에너지 시스템 설치 가능성 평가를 위해 필요한 정보를 취득하여 전용 데이터베이스를 구성하였고, 데이터베이스의 정보를 활용하여 지열정 용량을 산정하는 방법을 연구하였다. 본 연구는 추후 지역 환경평가 기준을 정립하고, 다른 신재생에너지에 대한 정보를 추가하여 신재생에너지 보급 활성화에 기여할 수 있는 연구를 진행할 예정이다.

• 방사선산업학회지
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• 제5권1호
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• pp.41-46
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• 2011

Polyacrylonitrile (PAN) fibers are the most widely used precursor of the materials for carbon fibers. The conventional process of carbon fibers from PAN precursor fiber includes two step; stabilization at low temperature and carbonization at high temperature. Compared to thermal stabilization, the stabilization process by electron beam (E-beam) irradiation is a advanced and brief method. However, a stabilization by E-beam irradiation was required a high dose (over 5,000 kGy) and spend over 1.5 hr (1.14 MeV, 1 mA). In the present work the main goal is exploring a quick stabilization process by cotrolling E-beam currents. The effect of various E-beam currents on stabilization of PAN precursor fiber was studied by gel fraction test, thermo gravimertic analysis (TGA), differential scanning calorimetry (DSC), tensile strength, and scanning electron microscopy (SEM) images.

• 방사선산업학회지
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• 제4권3호
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• pp.259-263
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• 2010

Carbon fibers are used as a reinforcement material in an epoxy matrix in advanced composites due to their high mechanical strength, rigidity and low specific density. An important aspect of the mechanical properties of composites is associated to the adhesion between the surface of the carbon fiber and the epoxy matrix. This paper aimed to evaluate the effects of electron beam irradiation on the physicochemical properties of carbon fibers to obtain better adhesion properties in resultant composite. Chemical structure and surface elements of carbon fiber were determined by FT-IR, elemental analysis and X-ray photoelectron spectroscopy, which indicated that the oxygen content increased significantly with increasing the radiation dose. Thermal stability of the carbon fibers was studied via the thermalgravimetric analysis. Surface morphology of carbon fiber was analyzed by scanning electron microscope. It was found that the degree of surface roughness was increased by electron beam irradiation.