• 한국태양광발전학회지
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• 제6권2호
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• pp.34-41
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• 2020

최근 주요 기업들을 대상으로 전력 사용을 100% 재생에너지로 전환하자는 RE100 캠페인이 국내외에서 뜨거운 관심을 받고 있다. 2019년 12월 기준으로는 Apple, BMW Group 등 전 세계 211개 기업이 RE100 캠페인에 참여한 것으로 알려져 있다. RE100이 확산됨에 따라 해외 RE100 기업이 국내 협력기업에게도 재생에너지 사용을 요청하는 사례가 발생하고 있는데, 국내는 RE100 도입을 위한 전력거래제도가 마련되지 않았고, 재생에너지 발전원가가 높아 당장의 RE100 이행은 어려운 상황이다. 이에 따라, 장차 RE100이 국내 기업에 무역장벽으로 작용할 가능성이 제기되고 있어 본고에서는 RE100의 현황과 RE100 도입 비용을 낮추는 방안으로써 RE100과 탄소배출권의 연계에 대해 논의하고자 한다. 이를 통해 탄소배출권과 연계한 RE100 이행이 가능해지는 경우, 국내 재생에너지 보급 확대 및 국가 탄소배출 감축 계획 이행에 기여할 수 있을 것으로 예상된다.

• Current Photovoltaic Research
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• 제10권2호
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• pp.62-71
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• 2022

The Global RE100 campaign is a one of the voluntary campaign, but it has a lot of influence on domestic companies that have not yet joined the Global RE100. Accordingly, the Korean government introduced the Korean RE100 (K-RE100) system to prepare an institutional mechanism for domestic companies to respond to RE100. However, in Korea, due to the high LCOE of renewable energy and institutional limitations of the power transaction system, there is a limit for companies to implement RE100 in various ways. Therefore, in this study, the implementation cost of RE100 for green tariff, REC purchase, third-party PPA, direct(or corporate) PPA, and self-generation was compared and analyzed to derive the order of implementation with the net present value (NPV) of costs incurred over 20 years. As a result, self-construction was analyzed as the most economical method, but the implementation through the green tariff seemed to be the most realistic implementation method so far. However, considering the gradually falling LCOE, third-party PPA and direct PPA could be secured competitiveness against green tariff in 2025 and 2026. Then it could allow the companies to have various portfolios for implementation of RE100.

• 한국식품영양과학회지
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• 제42권12호
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• pp.1949-1957
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• 2013

본 연구에서는 6개의 지역(강원도, 경기도, 경상도, 서울, 전라도, 충청도)에서 채취한 가공 및 외식식품 38종에 함유되어 있는 ${\beta}$-carotene 및 retinol의 함량을 조사하였다. 이들 지용성 비타민들은 알칼리를 이용한 직접 검화법과 용매추출법을 병행하여 수행하였다. 면류 식품 14종 중에서 ${\beta}$-carotene 함량은 비빔국수와 쫄면에서 각각 평균 442.43 ${\mu}g/100g$과 301.39 ${\mu}g/100g$이 검출되며 가장 높은 함량을 나타내었다. 비타민 A(${\mu}gRE$) 함량은 비빔국수와 회냉면, 쫄면, 비빔냉면이 각각 77.5 RE와 61.3 RE, 56.4 RE, 53.2 RE이었다. 만두류 식품 4종에서는 김치만두에서 ${\beta}$-carotene 197.64 ${\mu}g/100g$으로 가장 높게 검출되었으며, 비타민 A(${\mu}gRE$) 함량은 33.3 RE이었다. 떡류 제품 12종에서는 매운 떡볶이와 모듬찰떡에서 ${\beta}$-carotene 함량이 각각 평균 205.11 ${\mu}g/100g$과 41.33 ${\mu}g/100g$으로 검출되었으며, retinol은 매운 떡볶이(1.65~10.45 ${\mu}g/100g$)에서만 검출되었다. 매운 떡볶이와 모듬찰떡의 경우, 비타민 A(${\mu}gRE$)의 함량은 각각 39.67 RE와 6.89 RE로 환산하였다. 이는 하루 필요한 비타민 A(700 ${\mu}gRE$)의 1~6%에 해당하는 함량이다. 제빵류 8종에서는 ${\beta}$-carotene 함량이 야채고로케(110.43~192.29 ${\mu}g/100g$), 햄&치즈샌드위치(33.07~116.57 ${\mu}g/100g$), 페이스트리빵(33.69~104.87 ${\mu}g/100g$), 마늘빵(빵집, 33.88~81.21 ${\mu}g/100g$), 버터크림빵(빵집, 31.61~85.84 ${\mu}g/100g$)에서 높게 검출되었다. 비타민 A(${\mu}gRE$)의 함량은 제빵류 중에서 페이스트리빵과 버터크림빵(빵집), 모닝빵들이 각각 77.3 RE와 51.2 RE, 41.4 RE를 나타내며 가장 높은 함량을 보였다.

• 한국식품영양과학회지
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• 제44권3호
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• pp.418-424
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• 2015

본 연구는 식품성분표 개정을 위한 기초연구로서 농산식품인 조미료류 5개, 차류 2개, 채소류 2개, 곡류 3개, 견과류 및 종실류 6개, 유지류 2개, 과일류 20개에 함유되어 있는 기능성 영양성분 중 하나인 베타카로틴 함량을 분석하였다. 대표성과 신뢰성이 확보된 베타카로틴의 분석품질을 확보하기 위하여 참값을 알고 있는 표준인증물질인 slurried spinach(SRM 2385)의 베타카로틴 함량을 측정한 결과 RSD 1.73%였으며, 회수율은 102%로 아주 양호한 결과를 얻었다. 농산식품 분석 결과 채소류와 차류에서 비교적 높은 베타카로틴 함량이 검출되었다. 보리순가루 $17,293.95{\mu}g/100g$($2,882.33{\mu}gRE$), 보리순 생것 $2,755.15{\mu}g/100g$($459.19{\mu}gRE$), 녹차가루 $7,579.04{\mu}g/100g$($1,263.17{\mu}gRE$), 마른 녹차잎 $13,671.85{\mu}g/100g$($2,278.64{\mu}gRE$)으로 베타카로틴 함량이 비교적 높았다. 견과류 및 종실류의 베타카로틴 함량 분석 결과 검은 참깨 마른 것 $41.27{\mu}g/100g$($6.88{\mu}gRE$), 들깨 마른 것 $33.06{\mu}g/100g$($5.51{\mu}gRE$), 흰 참깨 마른 것 $25.36{\mu}g/100g$($4.23{\mu}gRE$) 순으로 베타카로틴 함량이 검출되었다. 유지류의 베타카로틴 함량 분석 결과 들기름 $58.56{\mu}g/100g$($9.76{\mu}gRE$)과 참기름 $11.41{\mu}g/100g$($1.90{\mu}gRE$)으로 측정되었다. 과일류 20개에서는 살구 생것 $2,280.35{\mu}g/100g$($380.06{\mu}gRE$)과 파파야완숙 생것 $242.57{\mu}g/100g$($40.43{\mu}gRE$), 파파야적숙 생것 $162.70{\mu}g/100g$($27.12{\mu}gRE$)으로 비교적 높은 베타카로틴 함량을 나타내었다. 거봉 생것, 청포도 생것, 켐벨얼리포도 생것의 경우 껍질을 포함하였을 때 베타카로틴 함량이 높게 측정되었다.

• 신재생에너지
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• 제18권3호
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• pp.43-59
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• 2022

The green premium is the most important feature of Korea's RE100 system. Green premium has three characteristics. The first, the cost of implementation is lower than that of other means of implementation. The second, it is linked with the RPS system to keep the means of implementing the green premium low. Third, the funds raised by the green premium are used to supply renewable energy to compensate for the additionality that the green premium does not have. When the entire industrial sector's electricity consumption is converted to renewable energy, the implementation cost of the green premium is estimated to be 3,377.4 billion won, and the REC purchase is estimated to incur the implementation cost of 6,576.4 billion won, which is 3.5 trillion more than the green premium. It was analyzed that an additional implementation cost of KRW 100 million would occur. In addition, in the case of solar PPA, it was analyzed that additional implementation costs of KRW 13,375.7 billion to KRW 16,162.3 billion were incurred. It was estimated that the renewable energy that could be supplied to the green premium would at least be sufficient for companies exporting to the US and EU. In addition, it was analyzed that when the fund created as a green premium is used for renewable energy supply, about 30.7% of the renewable energy supply through PPA can be supplied. However, as ESG is emphasized, green premium can be criticized by green washing because there is no additionality. There is also a limit to responding to the EU's CBAM. Therefore, companies can use the green premium depending on the situation, but it is more advantageous to use PPA, etc. The government needs to sufficiently maintain the supply of renewable energy using the fund to maintain the green premium.

• Current Photovoltaic Research
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• 제11권4호
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• pp.134-143
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• 2023

Efforts are being made to respond to global warming. Interest in and demand for the private sector-led RE100 campaign is also increasing. Self-built solar power generation, one of the implementation tools for RE100, is not expanding. However, it can be an economical means of implementation in the long run. In this study, we intend to analyze the impact on the optimal ratio of self-solar power generation using HOMER simulation. OPR defines the optimal solar power generation ratio and looks into what changes there are in the optimal solar power ratio when self-power consumption increases and external power purchase price changes. As a result, the optimal rate of self-solar power generation has a low impact even if self-power consumption increases. As the external power unit price increases, the optimal ratio increases, and at a power unit price of 100 KRW/kWh, OPR is 24%; at 200 KRW/kWh OPR is 31%; and at 300 KRW/kWh OPR is 34%. This shows that the electricity price replaced during the life cycle has a high impact on the economic feasibility of solar power generation. However, when the external power unit price reached a certain level, the increase in OPR decreased. This shows that it is difficult for domestic companies to achieve RE100 based on the economic feasibility of solar energy alone. Therefore, efforts are needed to supply renewable energy in the public sector.

• 설비공학논문집
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• 제7권2호
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• pp.207-216
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• 1995

Flow and heat transfer characteristics of mixed convection heat transfer in a rectangular en-closure with various outlets are numerically investigated. The parameters considered here include Reynolds number, Grashof number and the position of outlet. The results show streamlines, isotherms, Nusselt numbers, velocity and temperature distributions. It has been shown that as Reynolds number increases, the size of cell decreases at Re$\leq$100 and increases at Re>100 for $Gr=10^4$. There is a minimum size of cells at Re=100, $Gr=10^4$. The maximum mean Nusselt number occurs at Re=400, $Gr=10^4$ and one right outlet. The mean Nusselt numbers can be formulated by the correlation equation $Nu=C{\cdot}Gr^a{\cdot}Re^b$.

• 한국의류산업학회지
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• 제24권6호
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• pp.812-824
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• 2022

This study proposes to develop a 3D printed re-entrant(RE) strip by shape memory thermoplastic polyurethane that can be deformed and recovered by thermal stimulation. The most suitable 3D printing infill density condition and temperature condition during shape recovery for mechanical behavior were confirmed. As the poisson's ratio indicated, the higher the recovery temperature, the closer the poisson's ratio to zero and the better the auxetic properties. After recovery testing for five minutes, it appeared that the shape recovery ratio was the highest at 70℃. The temperature range when the shape recovery ratio appeared to be more than 90% was a recovery temperature of more than 50℃ and 60℃ when deformed under a constant load of 100 gf and 300 gf, respectively. This indicated that further deformation occurred after maximum recovery when recovered at a temperature of 80℃, which is above the glass transition temperature range. As for REstrip by infill density, a shape recovery properties of 100% was superior than 50%. Additionally, as the re-entrant structure exhibited a shape recovery ratio of more than 90%, and exhibited auxetic properties. It was confirmed that the infill density condition of 100% and the temperature condition of 70℃ are suitable for REstrips for applying the actuator.

• 한국주조공학회지
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• 제29권3호
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• pp.144-149
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• 2009

In this study, we investigated optimum condition of cooling plate method to obtain semi-solid AM100A Mg alloy with fine and globular morphology. AM100A Mg alloy were hot extruded at $380^{\circ}C$ extrusion temperature under extrusion ratio of 25 : 1 and ram speed of 2.4 mm/sec. Vickers hardness test, optical microscopy, scanning electron microscopy, and image analyzer were performed to identify the optimum conditions of cooling plate method. Optimum conditions of cooling plate method to fabricate semi-solid AM100A Mg alloy with fine and globular microstructures were achieved at a pouring temperature of $602^{\circ}C$ and the angle of cooling plate of 60 degree.

• 대한기계학회논문집B
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• 제36권3호
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• pp.301-307
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• 2012

정밀한 물질분배기관인 인체 기관지의 기능을 이해하기 위해서는 호흡에서 발생하는 다양한 유동 및 형상 조건에서 압력손실특성을 파악하는 것이 필수적이다. 본 연구는 기관지 구조의 기본 단위인 분지관의 층류 흡기유동 압력손실을 수치해석을 통해 확인하였다. 인체 기관지에 대한 관찰에서 보고되는 비대칭 형상과 유량분배비율 범위 안에서 압력손실계수 K 는 Re 와 관의 길이만의 함수로 다음과 같이 표현이 가능하며 $K{\propto}Re^{-1}(\frac{L}{d})^{3/4}$, Re<100, $K{\propto}Re^{-1/2}\(\frac{L}{d}\)^{1/2}$, $Re\geq100$, 이는 대칭 분지관의 관계식과 동일한 것이다. 연속분지로 입구 유속분포가 편향될 경우 분지관 압력손실의 변화는 4% 미만이었으며 분지가 반복될수록 그 차이는 줄어들어 무시할 만하였다.