• 무역학회지
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• 제41권2호
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• pp.185-202
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• 2016

온실가스 감축 의무와 방사능 유출 우려 등으로 각국의 신·재생에너지에 대한 관심이 높아지고 있다. 그 중에서도 태양광은 가장 현실적인 에너지로 주목받고 있으며, 세계 시장의 수요가 증가함에 따라 한국 태양광 산업의 해외진출 및 무역요인에 관한 체계적 분석이 필요하다. 본 연구에서는 한국과 태양광 제품을 거래하는 11개국을 대상으로 1990년부터 2014년까지 총 25년간의 패널데이터를 연구하여 보았다. 중력모형을 중심으로 분석을 시행하였으며, 분석결과 한국의 태양광 제품은 일반적으로 중력모형과 일치하는 것으로 나타났다. 그러나 경제규모와 거리 이외의 요인에서는 각각 다른 결과가 도출되었다.

• 에너지공학
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• 제24권3호
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• pp.164-172
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• 2015

국가 기간산업 중 하나인 정유산업은 산출물인 석유제품을 각 산업부문에 중간재로 공급하고 있으므로 석유제품의 공급지장이 국민경제에 미치는 영향은 큰 편이다. 이에 본 논문에서는 정유산업 산출물 1원 어치의 공급지장이 타 산업에 미치는 부정적 생산차질 효과를 의미하는 공급지장효과를 분석하고자 한다. 이를 위해 산업간 중간재의 흐름을 하나의 표로 나타낸 산업연관표를 활용한 산업연관분석을 적용하고자 한다. 보다 구체적으로는 공급유도형 모형을 활용하되 1990년부터 2012년까지를 분석대상 기간으로 한다. 아울러 조선산업, 반도체산업, 철강산업과 같은 타 국가 기간산업과의 비교분석도 수행한다. 분석결과 2012년 기준 정유산업의 공급지장효과는 0.9025원으로 분석되었다. 세부적으로 살펴보면 화학제품산업 및 운송서비스산업에 미치는 공급지장효과가 각각 0.2113원 및 0.1140원으로 비교적 큰 편이었다. 정유산업의 공급지장효과는 철강산업에 대한 값(1.4131원)보다는 작지만 조선산업(0.0586원) 및 반도체산업(0.1111원)에 비해서는 큰 것으로 판단된다.

• 에너지공학
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• 제25권4호
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• pp.37-52
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• 2016

석유제품은 한국 및 일본 모두에서 1차 에너지원 중 소비 비중이 가장 높다. 이에 본 논문에서는 산업연관분석을 이용하여 한국 및 일본 정유산업의 국민경제적 역할을 비교 분석해 보고자 한다. 먼저 수요유도형 모형을 이용하여 정유산업의 생산유발효과 및 부가가치 유발효과를 살펴본다. 다음으로 공급유도형 모형 및 레온티에프 가격모형을 적용하여 각각 정유산업의 공급지장효과 및 물가파급효과를 분석한다. 이 과정에서 정유산업을 내생부문이 아닌 외생부문으로 다룸으로써 정유산업을 중심으로 한 논의결과를 제시한다. 수요유도형 모형의 분석 결과, 정유산업에서의 1원 생산이 타 산업에 미치는 생산유발효과는 한국 0.2620원 및 일본 0.6537원으로 일본의 값이 더 크다. 하지만 타 산업 부가가치 유발효과를 분석한 결과 각각 0.0946원 및 0.0536원으로 한국의 값이 일본의 값보다 크다. 정유산업 산출물 1원 어치의 공급지장이 타 산업에 미치는 부정적 생산차질효과를 의미하는 공급지장효과를 살펴보면, 한국 0.9657원 및 일본 1.4476원으로 일본 정유산업의 공급지장효과가 더 큰 것으로 분석되었다. 정유산업의 산출물 가격 10% 인상으로 인한 물가파급효과는 한국 0.3819% 및 일본 0.3409%로 한국의 값이 더 큰 것으로 분석되었다.

• 한국태양에너지학회 논문집
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• 제34권4호
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• pp.101-109
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• 2014

The Consultation about Energy Use Plan is prescribed by the Energy Use Rationalization Act. This study calculated the Standard Data for Energy Use Plan of Industry Complex by the 9th Korean Standard Industrial Classification Divisions so that the energy demand reflecting the industrial technology change and characteristics of Manufacturing Divisions would predict. To achieve this aim, analysis on thousands of data in Energy Consumption Report Forms reported from industries which annual consumption of energy exceeds 2,000toe from 2009 to 2010 was carried out. The results showed that calculated overall mean fuel basic unit decrease, electricity basic unit increase and energy basic unit increase compared to that of the Notification No. 2002-130 of the Ministry of Commerce, Industry and Energy, therefore it means that heat source of energy facilities transferred from fuel to electricity. Also resultingly suggests that the related notification, code etc. are amended as soon as possible.

• Journal of Electrical Engineering and Technology
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• 제10권1호
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• pp.1-7
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• 2015

The industry has rapidly growth and energy supply technology advanced are become main factor which to contribute of the harmonic losses. This problem is one aspect that may affect the capability of the transmission line and also to the efficiency of electricity. This paper proposes a new scheme to allocate the cost pertaining to transmission loss due to harmonics. The proposed method, called as Generalized Harmonic Distribution Factor, uses the principle of proportional sharing method to allocate the losses among the transmission users especially for industry consumers. The IEEE 14- and 30 bus test system is used to compare the proposed method with existing method. The results showed that the proposed method provided a scheme better in allocating the cost of transmission loss, which could encourage the users to minimize the losses.

• 한국지열·수열에너지학회논문집
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• 제13권4호
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• pp.21-30
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• 2017

Recently, It has increased the importance of building energy saving. Pipe insulation as well as building envelope insulation is to improve energy efficiency and reduce the energy loss. However, there continues to use the old standard for pipe insulation that is one of the most important elements in energy savings in buildings. The purpose of this study is to propose suitable pipe insulation thickness for reducing building energy use. The study also reviews pipe insulation thickness standard in accordance to Korea standard, ASHRAE 90.1 and BS5422 and analyzed through thermal simulation. As a result, it is necessary to apply the performance design method of the pipe insulation thickness to reduce the energy loss of the piping.

• 방사선산업학회지
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• 제5권2호
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• pp.131-135
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• 2011

In this study, we fabricated the HDPE and ${\alpha}-Al_2O_3$ composites with PE-g-MA as a function of the ${\alpha}-Al_2O_3$ nanopowder weight ratios. The electron beam irradiations on HDPE/${\alpha}-Al_2O_3$ composites were carried out over a range of absorbed doses from 20 to 200 kGy to make three-dimensional network structures. The mechanical properties were characterized using UTM for confirming the changes of the flexural strength and tensile strength. It was observed that the mechanical properties of HDPE were enhanced by the addition of ${\alpha}-Al_2O_3$. However, the strength of the 5 wt% ${\alpha}-Al_2O_3$ added composites decreased due to the nano-powder aggregation. The mechanical properties of composites were increased as increasing the electron beam irradiation up to 150 kGy. We believed that the electron beam irradiated HDPE/${\alpha}-Al_2O_3$ composites can be a good candidate for a variety of industrial applications.

• 방사선산업학회지
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• 제6권2호
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• pp.159-164
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• 2012

Bacterial cellulose (BC) is generated from citrus gel by Gluconacetobacter hansenii TL-2C. BC has good properties such as high-burst pressure, high-water contact and the ultrafine highly nanofibrous structure of mimic natural extracellular matrix (ECM) for tissue engineering. In this study, acrylic acid (AAc) was grafted onto BC surfaces under aqueous conditions using gamma-ray irradiation, and then immobilized gelatin onto AAc-g-BC. The characterization of scaffolds was performed by scanning electron microscopy (SEM), attenuated total reflectance-Fourier transform infrared spectroscopy (ATR-FTIR), toluidine blue O (TBO) assay. Morphology of gelatin and AAc incorporation onto BC nanofibers did not changed. Our study suggests that gelatin-immobilized BC nanofibers scaffold has a potentiality to fabricate 3D nanofibrous scaffolds for tissue engineering.

• 방사선산업학회지
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• 제5권4호
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• pp.371-376
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• 2011

The surface property of the materials used in tissue engineering application has been essential to regulate cellular behaviors by directing their adhesion on the materials. To modulate surface property of the synthetic biodegradable materials, a variety of surface modification techniques have used to introduced surface functional groups or bioactive molecules, recently polydopamine coating method have been introduce as a facile modification method which can be coated on various materials such as polymers, metals, and ceramics regardless of their surface property. However, there are no reports about the degree of polydopamine coating on the materials with different hydrophilicity. In the present study, we prepared acrylic acid grafted nanofibrous meshes using electron-beam irradiation, and then coated meshes with polydopamine. Polydopamine successfully coated on the all meshes, both properties of acrylic acid and polydopamine were detected on the meshes. In addition, the degree of polydopamine deposition on the materials has been altered according to surface hydrophilicity, which was approximately 8-times greater than those on the non-modified materials. In conclusion, dual effect from the acrylic acid grafting and polydopamine may give a chance as a alternative tool in tissue engineering application.

• 방사선산업학회지
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• 제5권2호
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• pp.137-143
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• 2011

Epoxy resins are widely used as high performance thermosets in many industrial applications, such as coatings, adhesives and composites. Recently, a lot of research has been carried out in order to improve their mechanical properties and thermal stability in various fields. Carbon nanotubes possess high physical and mechanical properties that are considered to be ideal reinforcing materials in composites. CNT-reinforced epoxy system hold the promise of delivering superior composite materials with their high strength, light weight and multi functional features. Therefore, this study used multi-walled carbon nanotubes (MWNT) and gamma rays to improve the mechanical and thermal properties of epoxy. The diglycidyl ether of bisphenol A (DGEBA) as epoxy resins were cured by gamma ray irradiation with well-dispersed MWNTs as a reinforcing agent and triarylsulfonium hexafluoroantimonate (TASHFA) as an initiator. The flexural modulus was measured by UTM (universal testing machine). At this point, the flexural modulus factor exhibits an upper limit at 0.1 wt% MWNT. The thermal properties had improved by increasing the content of MWNT in the result of TGA (thermogravimetric analysis). However, they were decreased with increasing the radiation dose. The change of glass transition temperature by the radiation dose was characterized by DMA (dynamic mechanical analysis).