• STI Policy Review
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• 제1권1호
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• pp.1-21
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• 2010

To achieve the "low carbon green growth" vision, the first step is securing core technologies. Therefore, S&T policy direction for green technology development is urgently needed. As of 2008, investment in green technology (GT) development hovered around 10% of the government's total R&D budget. Thus, the Korean government developed a plan to increase that percentage to 15%, by 2013. To develop reasonable investment strategies for green technology development, targeted strategies that reflect technology and market changes by green technology area are needed. However, the overall planning and coordination of national GT development is currently split among, approximately, 10 government ministries. To establish an efficient green technology development system, the so-called "Green Technology R&D Council" should be launched in collaboration with the Presidential Committee on Green Growth and the National Science and Technology Council. Furthermore, to build a solid foundation for commercializing the outcomes of GT development projects and promote GT transfer, the government should undertake two initiatives. First, the government should reinforce GT R&D performance management, by establishing a GT R&D performance management and evaluation system. Second, the government should implement the "customized packaged support for promoting green technology business rights and commercialization" and present "e-marketplace for market-oriented green technologies". Creating a pan-ministerial policy for GT development policy would necessitate restructuring the HR(Human Resources) development system, which is currently separated by technology area. Based upon mid/long-term HR supply and demand forecasts, the government should design differentiated HR development projects, continuously evaluate those projects, and reflect the evaluation results in future policy development. Finally, to create new GT-related industries, the "Green TCS (Testing, Certification, and Standards) System" needs to be implemented. For objective evaluation and diffusion of R&D results by green technology area, a common standardization plan for testing, analysis, and measurement, like the "Green TCS", should be developed and integrated.

• Journal of the Korean Wood Science and Technology
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• 제37권3호
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• pp.265-273
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• 2009

본 연구는 삼나무 부위별 추출물들의 피부사상균 Trichophyton mentagrophytes, Trichophyton rubrum, Microsporum gypseum에 대한 항진균 활성을 평가하였다. 항진균 활성의 평가는 디스크확산법과 한천희석법을 사용하였고 활성 성분의 주성분을 확인하기 위해 GC/MS 분석을 실시하였다. 항진균 활성은 삼나무의 정상재와 흑심재 중 흑심재의 심재가 가장 높은 활성을 보였다. 활성 성분은 n-hexane과 chloroform를 전개용매로 이용하여 TLC를 실시하였다. TLC를 통해 분리된 활성 성분들에 대해 다시 항진균 활성을 측정한 결과 7번째 분획물이 가장 높은 활성을 나타내었다. 분획물에 대하여 GC/MS 분석을 실시한 결과 탄소개수 13개를 가지는 damascone에 탄소 2개가 더해진 sesquiterpene으로 예상되었다. 이밖에 elemol, eudesmol, hinokione 등도 검출되었다.

• 한국재료학회지
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• 제11권5호
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• pp.431-437
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• 2001

본 연구는 제조공정을 달리한 0.14C-6.5Mn강을 2상영역에서 역변태처리 하였을 때 다량의 잔류오스테나이트를 생성시키기 위한 열처리 조건을 제시하고 잔류오스테나이트의 생성과 관련하여 미세조직 관찰, C, Mn의 분배거동 및 기계적성질을 조사하였다. 잔류오스테나이트는 역변태처리시 오스테나이트내에 C, Mn의 확산으로 농축되어 안정화되며 연성향상에 크게 기여한다. 30%이상의 잔류오스테나이트를 확보하기 위해서는 6457에서 역변태처리하는 것이 효과적이지만, 잔류오스테나이트의 부피 분율과 기계적안정성을 고려하면 $620^{\circ}C$에서 열처리하는 것이 바람직하다. 냉연재의 강도.연성조합값은 3강종 모두 $620^{\circ}C$에서 1시간 역변태처리한 경우 4000kg/$\textrm{mm}^2$정도로 매우 우수하지만 고온에서는 연성감소로 인하여 그 값이 현저하게 저하하였다. 0.14C-6.5Mn계 TRIP강에서 잔류오스테나이트 생성과 기계적성질에 미치는 1.1%Si 첨가효과는 매우 미약하였다.

• Journal of Microbiology and Biotechnology
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• 제24권1호
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• pp.87-96
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• 2014

In the present study, a yeast species isolated from CETP, Vellore, Tamilnadu was identified as Cryptococcus sp. VITGBN2 based on molecular techniques and was found to be a potent producer of acidic diacetate sophorolipid in mineral salt media containing vegetable oil as additional carbon source. The chemical structure of the purified biosurfactant was identified as acidic diacetate sophorolipid through GC-MS analysis. This sophorolipid was used as a stabilizer for synthesis of zinc oxide nanoparticles (ZON). The formation of biofunctionalized ZON was characterized using UV-visible spectroscopy, XRD, scanning electron microscopy (SEM), and Fourier transform infrared spectroscopy. The antimicrobial activities of naked ZON and sophorolipid functionalized ZON were tested based on the diameter of inhibition zone in agar well diffusion assay, microbial growth rate determination, protein leakage analysis, and lactate dehydrogenase assay. Bacterial pathogen Salmonella enterica and fungal pathogen Candida albicans showed more sensitivity to sophorolipid biofunctionalized ZON compared with naked ZON. Among the two pathogens, S. enterica showed higher sensitivity towards sophorolipid biofunctionalized ZON. SEM analysis showed that cell damage occurred through cell elongation in the case of S. enterica, whereas cell rupture was found to occur predominantly in the case of C. albicans. This is the first report on the dual role of yeast-mediated sophorolipid used as a biostabilizer for ZON synthesis as well as a novel functionalizing agent showing antimicrobial property.

• 대한환경공학회지
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• 제27권5호
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• pp.542-548
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• 2005

부착 미생물을 이용한 다공성 담체 유동상 반응기는 하폐수중의 유기물 및 질소제거에 많이 적용되어져 왔다. 특히 생물막이 형성된 담체에서는 호기, 무산소 그리고 혐기영역이 공존하여 동시적 질산화/탈질 반응에 의한 질소제거에 유리한 환경이 제공된다고 알려져 있다. 이러한 반응을 활성화시키기 위해서는 담체표면과 내부에서 산소와 유기물등의 적절한 기질확산이 이루어져야 한다. 그러나 하폐수중의 유기물농도나 생물막의 마찰조건등 운전조건에 따라서는 표면에서의 종속영양균의 과잉성장에 의해 질소 제거 반응이 저해되기도 한다. 다공성 담체 유동상 반응기에 막모듈을 결합시킨 하이브리드 반응기는 단일조내에서 활성화된 동시적 질산화/탈질 반응으로 종래의 유동상 반응기에 비해 30% 이상 질소제거 효율이 증가하였다. 미소전극 연구를 통해 담체내부의 탈질율을 조사할 수 있으며 유동상 반응기에 비하여 하이브리드 반응기내 담체내부에서는 탈질반응에 대한 유기물의 확산에 대한 제한인자가 작으며 따라서 보다 높은 탈질율을 유지할 수 있음을 보였다.

• 한국수소및신에너지학회논문집
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• 제20권6호
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• pp.499-504
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• 2009

The effect of gas diffusion layer (GDL) compression caused by different stack clamping pressures on fuel cell performance was experimentally studied in a miniature 5-cell proton exchange membrane fuel cell (PEMFC) stack. Three stacks with different GDL compressions, 15%, 35% and 50%, were prepared using SGL 10BC carbon fiber felt GDL and Gore 57 series MEA. The PEMFC stack performance and the stack stability were enhanced with increasing stack clamping pressure resulting in the best performance and stability for the stack with higher GDL compressions up to 50%. The excellent performance of the stack with high GDL compression was mainly due to the reduced contact resistance between GDL and bipolar plate in the stack, while reduced gas permeability of the excessively compressed GDL in the stack hardly affected the stack performance. The high stack clamping pressure also resulted in excessive GDL compression under the rib areas of bipolar plate and large GDL intrusion into the channels of the plate, which reduced the by-pass flow in the channels and increase gas pressure drop in the stack. It seems that these phenomena in the highly compressed stack enhance the water management in the stack and lead to the high stack stability.

• 대한화학회지
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• 제39권11호
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• pp.842-847
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• 1995

유리질 탄소전극을 사용하여 조사한 몇가지 N'-aryl-N-alkyl-N-nitrosourea 유도체들의 전기화학적 환원반응은 확산지배적이고 비가역적인 반응이었다. 이들 유도체들의 환원 반응시의 교환속도 상수 $k_0$값은 $1.48{\times}10^{-6}{\sim}5.32{\times}10^{-7}\;cm/sec.$의 값을 나타내었었다. Aryl기 및 alkyl기의 치환기에 따른 교환속도상수는 $k_0$ N'-aryl-N-alkyl-N-nitrosourea 에서 aryl기가 phenyl일 경우, 다른 치환기보다 $k_0$값이 1.3-2.8배였다. N'-aryl-N-alkyl-N-nitrosourea 와 N'-aryl-N-(2-chloroethyl)-N-nitrosourea의 두 화합물에서 aryl기의 치환기가 같을 경우는 비슷한 값을 나타내었다. N'-aryl-N-methyl-N-nitrosourea 유도체는 pH값이 높아짐에 따라 $E_p$값이 음전위쪽으로 이동하며 각 환원 반응에 참여한 $H^+$의 수는 4-5개였다. 이경우 aryl기의 치환기 효과는 환원전위에 크게 영향을 미치지 않는 것으로 나타났다.

• 전기학회논문지
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• 제66권2호
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• pp.347-353
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• 2017

In order to prohibit global warming, various kinds of regulatory policies have been established in the whole world. One example is the establishment of the Renewable Portfolio Standard. It requires the increased portion in energy production from renewable energy sources. The Republic of Korea adopted the act on the promotion of the development, use, and diffusion of new and renewable energy since 2012. However, in spite of the effort on the consideration of the renewable energy sources, it was reported the carbon intensity of electricity in Korea was not that low in 2015. Thus, it is required to examine the recent state of the utilization degree of the renewable energy sources in Korea. This paper analyzed the statistical data provided by Korea Power Exchange (KPX) to examine any problems and solutions for generating electricity from the renewable energy sources. We focused on the generation capacity provided by the power plants participated in the market, the electric power trading amount, and the utilization coefficient for 10 years. By analyzing the data, we provide an alternative to solve some imbalance among the factors contributing to renewable energy use.

• 토지주택연구
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• 제2권4호
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• pp.491-501
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• 2011

This study estimated economic value and benefits of Yongsan National Park, which will be constructed by financial investment of the government and objectively estimated the real value of it by understanding the value of the park from a user's view of the park. For this, the value of Yongsan National Park is divided into using value such as carbon reduction and the function of relieving urban heat island as an environmental material and non-using value based on willingness to pay of the public according to the construction of the park. As a result of the analysis, it was found out that the using value of Yongsan National Park would reach 130 million won up to maximum level of 450 million won per year, and the non-using value was analyzed to be worthy of 2,344 won per capita every month. Besides, economic ripple effect that can be expected in the process of the park construction project was analyzed to be a national policy that creates effect on production inducement of 2.6 trillion won and value added of 809.6 billion won and new jobs for 25,620 persons. Considering the value of Yongsan National Park and the effect of the project based on the result of this study, it was found that it could sufficiently secure the validity of implementing the project compared to the financial investment by the government. Therefore, it must be emphasized that diffusion strategy is necessary for national understanding and for a nation to make it understood its appropriateness widely in respect to the construction of Yongsan National Park for the successful construction of Yongsan National Park and to raise its using value in the future.

• 열처리공학회지
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• 제4권2호
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• pp.19-26
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• 1991

강의 내마모성과 내식성을 증가시키기 위하여 종래의 방법보다 우수한 확산표면경화처리에 대하여 연구하였다. 무수붕사($Na_2B_4O_7$)를 주체로 하는 해당염욕에 첨가물로서 -100 mesh의 Fe-V를 첨가한 후 각각 탄소량을 달리하는 시편을 침적시켜 탄화물층의 형성유무와 탄화물층과 침척시간과의 관계 및 피처리재중의 탄소량과의 관계에 대하여 조사하였고, 탄화물층내의 미소경도를 측정하였다. 연구결과는 다음과 같다. (1) 탄화물층은 모재표면의 C원자와 붕사욕 중에 용출된 V와 결합에 의해서 형성되고 형성된 탄화물층 속으로 확산해서 모재 중의 C원자가 표면에 보급되는 것에 의해서 성장한다. (2) 탄화물층의 두께는 온도와 탄소량이 일정할 경우 침척시간의 1/2 승에 비례하였다. 또한 온도와 침적시간이 일정할 경우 탄소량이 증가할수록 탄화물층의 두께는 증가하였다. (3) 시편의 표면에 형성된 탄화물층은 VC층이었으며, 이 탄화물층 내의 미소경도는 $H_v$ 3,000 이상이다.