• 한국해양바이오학회지
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• 제10권2호
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• pp.91-96
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• 2018

There are many eutrophic lakes by point and non-point pollution sources such as in dustrial waste water, domestic raw sewage, and mucks. The eutrophic lakes not only cause algal blooms but also destroy the ecosystem in the lakes due to high nutrient concentrations. The purpose of this study was to improve water quality in eutrophic lakes by cultivating microalgae using photobioreactors (PBRs) with selectively permeable mesh (SPM), supplying nutrients in the lake and inhibiting cell leakage by diffusion and water permeability. Chlorella vulgaris, was cultivated using PBRs with SPM installed in Inkyung Lake located in Inha university, Incheon, Korea. When cultivating C. vulgaris, $8.3g/m^2/day$ of average biomass productivity was obtained at 3 days. Furthermore, concentrations of total nitrogen and phosphorus were reduced by 35.7% and 84.2%, respectively, compared to initial condition and water quality in eutrophic lake was improved to oligotrophic environment. These results suggest that microalgal cultivation using PBRs with SPM in the lake could produce microalgal biomass as well as improve water quality by decreasing nutrient concentrations.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2008년도 Asian Magnetics Conference
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• pp.113-113
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• 2008

• 한국해양바이오학회지
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• 제9권2호
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• pp.35-42
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• 2017

Hydrothermal liquefaction of lipid-extracted Tetraselmis sp. feedstock containing 80 wt.% water was conducted in a batch reactor at different temperatures (300, 325, and $350^{\circ}C$) and reaction times (5, 10, 20, 40, and 60 min). The biocrude yield, elemental composition and higher heating value obtained at various reaction conditions were used to predict the optimum conditions for maximizing energy recovery of biocrude with good quality. A maximum energy recovery of 67.6% was obtained at $325^{\circ}C$ and 40 min with a high energy density of 31.8 MJ/kg and lower contents of nitrogen and oxygen. Results showed that reaction conditions of $325^{\circ}C$, 40 min was most suitable for maximizing energy recovery while at the same time achieving improved quality of biocrude.

• 한국해양바이오학회지
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• 제11권1호
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• pp.23-28
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• 2019

For successful microalgal biodiesel production, the strain should be selected carefully. Fast growth rate and high fatty acid contents are desired traits for algal biodiesel production. In ocean cultivation of microalgae, seawater temperature slowly changes over seasons, and rotating algal strains in accordance with their optimal temperature could improve overall productivity. Additionally, use of indigenous strain is preferred to alleviate potential impacts on the environment. In this study, five strains of Tetraselmis sp. from nearshore of Youngheung Island, Incheon, Korea, were isolated during winter and characterized for their growth patterns and fatty acid compositions in the low temperatures ($5-15^{\circ}C$). The five strains showed various characteristics in optimal growth temperature, fatty acid contents, and compositions. Compared with a strain of Tetraselmis sp., isolated from Ganghwa island in a previous study, a rapid-growing strain with 237% higher biomass productivity and an oleaginous strain with twice higher fatty acid contents at $10^{\circ}C$ were isolated. The oleaginous Tetraselmis strain showed the highest fatty acid productivity among the strains, having 438% higher productivity than the previous strain. Using the new isolates in the seasons with low seawater temperature would improve microalgal fatty acid productivity in ocean cultivation.

• Journal of Industrial and Engineering Chemistry
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• 제68권
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• pp.267-273
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• 2018

Hydrothermal liquefaction of Chlorella vulgaris feedstock containing 80% (w/w) water was conducted in a batch reactor as a function of temperature (300, 325 and $350^{\circ}C$) and reaction times (5, 10 and 30 min). The biocrude yield, elemental composition and higher heating value obtained for various reaction conditions helped to predict the optimum conditions for maximizing energy recovery. To optimize the recovery of inorganic nutrients, we further investigated the effect of reaction conditions on the ammonium ($NH_4{^+}$), phosphate ($PO_4{^{3-}}$), nitrate ($NO_3{^-}$) and nitrite ($NO_2{^-}$) concentrations in the aqueous phase. A maximum energy recovery of 78% was obtained at $350^{\circ}C$ and 5 min, with a high energy density of 34.3 MJ/kg and lower contents of oxygen. For the recovery of inorganic nutrients, shorter reaction times achieved higher phosphorus recovery, with maximum recovery being 53% at $350^{\circ}C$ and 5 min. Our results indicate that the reaction condition of $350^{\circ}C$ for 5 min was optimal for maximizing energy recovery with improved quality, at the same time achieving a high phosphorus recovery.

• Asian Journal of Innovation and Policy
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• 제6권3호
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• pp.295-312
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• 2017

The purpose of this case study is to understand the sustainability practices of knowledge transfer process at the Malaysian government-industry-academia consortium. At this stage in the research, the R&D consortium is defined as an established entity by two or more organizations that pool resources and shared decision making for cooperative research and development activities. In attempts to understand the formation, outcomes and sustainability of the sustainable knowledge transfer process, this paper conducted a systematic literature review based on Gough, Oliver and Thomas systematic reviews protocol. From the review, the data were enriched and enhanced with a better understanding of sustainable knowledge transfer process. The systematic review resulted in identifying six factors including internal and external perspectives. However, key sustainability factors are not only directly influencing KTP, and the consortium, but are also mediated by other organisational variables.

• Journal of Microbiology and Biotechnology
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• 제28권5호
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• pp.732-738
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• 2018

Novel carbon-based solid acid catalysts were synthesized through a sustainable route from lipid-extracted microalgal residue of Dunaliella tertiolecta, for biodiesel production. Two carbon-based solid acid catalysts were prepared by surface modification of bio-char with sulfuric acid ($H_2SO_4$) and sulfuryl chloride ($SO_2Cl_2$), respectively. The treated catalysts were characterized and their catalytic activities were evaluated by esterification of oleic acid. The esterification catalytic activity of the $SO_2Cl_2$-treated bio-char was higher ($11.5mmol\;Prod.{\cdot}h^{-1}{\cdot}gCat.\;^{-1}$) than that of commercial catalyst silica-supported Nafion SAC-13 ($2.3mmol\;Prod.{\cdot}h^{-1}{\cdot}gCat.^{-1}$) and $H_2SO_4$-treated bio-char ($5.7mmol\;Prod.{\cdot}h^{-1}{\cdot}gCat.^{-1}$). Reusability of the catalysts was examined. The catalytic activity of the $SO_2Cl_2$-modified catalyst was sustained from the second run after the initial activity dropped after the first run and kept the same activity until the fifth run. It was higher than that of first-used Nafion. These experimental results demonstrate that catalysts from lipid-extracted algae have great potential for the economic and environment-friendly production of biodiesel.

• Advances in environmental research
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• 제9권2호
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• pp.109-121
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• 2020

Phenol is frequently present as the hazardous pollutant in petrochemical and pesticide industry wastewater. Because of its high toxicity and carcinogenic potential, a proper treatment is needed to reduce the hazards of phenol carrying effluent before being discharged into the environment. Phenol biodegradation with microbial consortium offers a very promising approach now a day's. This study focused on the formulation of phenol degrading bacterial consortium with three bacterial isolates. The bacterial strains Bacillus cereus strain VCRC B540, Bacillus cereus strain BRL02-43 and Oxalobacteraceae strain CC11D were isolated from detergent contaminated soil by soil enrichment technique and was identified by 16s rDNA sequence analysis. Individual cultures were degrade 100 μl phenol in 72 hrs. The formulated bacterial consortium was very effective in degrading 250 μl of phenol at a pH 7 with in 48 hrs. The study further focused on the analysis of the products of biodegradation with Fourier Transform Infrared Spectroscopy (FT/IR) and Gas Chromatography-Mass Spectroscopy (GC-MS). The analysis showed the complete degradation of phenol and the production of Benzene di-carboxylic acid mono (2-ethylhexyl) ester and Ethane 1,2- Diethoxy- as metabolic intermediates. Biodegradation with the aid of microorganisms is a potential approach in terms of cost-effectiveness and elimination of secondary pollutions. The present study established the efficiency of bacterial consortium to degrade phenol. Optimization of biodegradation conditions and construction of a bioreactor can be further exploited for large scale industrial applications.

• 기술혁신학회지
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• 제18권2호
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• pp.318-337
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• 2015

정부의 R&D 투자는 지속적으로 증가하고 있지만, 그에 비해 정부출연연구기관의 기술이전이나 사업화 성공률은 투자에 비해 낮은 상황이다. 본 연구는 정부출연연구기관의 기술이전 사례 분석을 통해 성공적인 기술이전 방법론을 제시하였다. 구체적으로 K 연구원에서 실시한 3가지 유형의 기술이전 프로그램(수요기업 중심모델, 보유기술 중심모델, 컨소시엄 중심모델)의 사례 분석을 통해 연구원의 보유기술을 기업에 홍보하는 일반적인 형태의 기술이전 마케팅보다 잠재적인 수요기업 발굴을 통한 기술이전 방법이 기술이전에 더 효과적임을 설명하였다. 또한, 수요기업의 니즈를 고려한 R&D 사전기획이 기술이전 성과에 긍정적인 영향을 미치기 때문에, 이를 고려한 전략적 R&D 기획의 중요성을 시사하였다.

• 한국산학기술학회논문지
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• 제19권2호
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• pp.436-446
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• 2018

본 연구의 목적은 중소기업의 혁신활동과 사업성과 극대화 요인의 우선순위에 대한 연구이다. 각 정부부처별 지원사업이 다양한 산업별로 운영되고 있으며, 각 기업에 보조금, 지원금 및 마케팅, 기획, 교육등의 다양한 지원이 이루어지고 있고 각 기업들 또한 이에 참여하게 된다. 따라서 본 연구는 정부지원사업의 참여요인 즉, 기업혁신활동에 따라 사업성과에 긍정적인 영향을 미치는 혁신활동의 우선순위를 AHP기법을 이용해 분석하고 활용하는데 목적이 있다. 기업혁신활동의 계층구조는 '연구개발'과 '정부지원'으로 하였으며, '내부R&D, 외부R&D, 공동R&D'를 연구개발의 하위요인으로, '자금지원, 금융지원, 조세지원'을 정부지원의 하위요인으로 설정하였다. R&D정부지원을 1회 이상 받아 본 기업대상 분석결과, 정부지원(72.1%)이 연구개발(27.8%)에 비해 중요함을 알 수 있으며, 하위요인의 경우 자금지원(30.1%), 조세지원(22.7%), 금융지원(18.8%), 내부R&D(10.8%), 외부R&D(10.3%), 공동R&D(7.2%)의 순으로 나타났다. 이러한 분석결과는 중소기업의 사업성과 극대화에 영향을 미치는 요인중 연구개발과 정부지원의 세부혁신활동 우선순위가 제품혁신 및 공정혁신에 영향을 미치고 있다는 사실을 시사한다. 이러한 시사점은 정부지원사업에 참여하고자하는 중소기업들의 혁신활동 방향설정에 도움이 될 것으로 판단되며, 본 연구에서는 기업혁신을 효율적으로 추진하고자 하는 CEO들에게 결정요소간 전략적 우선순위를 제안하여 효율적으로 기업을 혁신하는데 도움을 주고자 한다.