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YuKyeong Cho,Min-Ji Kim,Sung-Koo Kim 한국생물공학회 2013 KSBB Journal Vol.28 No.6
Ethanol productions were performed by separate hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation (SSF) processes using seaweed, Enteromorpha intestinalis (sea lettuce). Pretreatment conditions were optimized by the performing thermal acid hydrolysis and enzymatic hydrolysis for the increase of ethanol yield. The pretreatment by thermal acid hydrolysis was carried out with different sulfuric acid concentrations in the range of 25 mM to 75 mM H₂SO₄, pretreatment time from 30 to 90 minutes and solid contents of seaweed powder in the range of 10~ 16% (w/v). Optimal pretreatment conditions were determined as 75 mM H₂SO₄ and 13% (w/v) slurry at 121℃ for 60 min. For the further saccharification, enzymatic hydrolysis was performed by the addition of commercial enzymes, Celluclast 1.5 L and Viscozyme L, after the neutralization. A maximum reducing sugar concentration of 40.4 g/L was obtained with 73% of theoretical yield from total carbohydrate. The ethanol concentration of 8.6 g/L of SHF process and 7.6 g/L of SSF process were obtained by the yeast, Saccharomyces cerevisiae KCTC 1126, with the inoculation cell density of 0.2 g dcw/L.
Yukyeong Lee,김은성,Sangeun Park,Jeong Min Park,Jae Bok Seol,Hyoung Seop Kim,이태경,Hyokyung Sung,Jung Gi Kim 대한금속·재료학회 2022 METALS AND MATERIALS International Vol.28 No.1
Process optimization of additively manufactured Ti–6Al–4V alloy is an important aspect of the production of engineered,high-performance parts for the aerospace and medical industries. In this study, the microstructural evolution and mechanicalproperties of direct energy deposition processed Ti–6Al–4V alloy were investigated using diferent processing parameters. Experimental analyses revealed that the line energy density corresponding to the processing parameters of the direct energydeposition process infuences the properties of additively manufactured Ti–6Al–4V alloy. First, an optimal line energydensity limits the incidence and size of voids resulting from a lack of fusion to enhance both alloy strength and ductility. Second, an excessively high energy density induces the coarsening of prior-β grains to impair both alloy strength with theHall–Petch relationship and alloy ductility due to the plastic deformation instability caused by the limited number of grains. These results indicate that both the extent of fusion and prior-β grain size afect the mechanical properties of additivelymanufactured Ti–6Al–4V alloy. Moreover, the results demonstrate the utility of the line energy density-based approach indetermining the optimal processing parameters for realizing high-performance materials.
OECD 국가의 제약바이오산업 혁신성과 원인조건 조합 분석
김유경(Yukyeong Kim),이상원(Sang-Won Lee) 한국바이오경제학회 2019 바이오경제연구 Vol.2 No.2
본 연구는 OECD 국가들의 제약바이오산업 혁신성과에 영향을 주는 원인조건 조합을 도출하기 위하여 퍼지셋질적비교분석(fuzzy set Qualitative Comparative Analysis) 방법을 사용하여 분석하였다. OECD 29개국을 분석 대상으로 R&D지출, 연구자 수, 규제의 질, 법치주의를 원인변수로 하고, 생명공학특허 출원 수와 수출 점유율을 혁신성과 결과변수로 하여, 혁신성과를 설명하는 원인조건 조합을 도출하였다. 분석결과 제약바이오산업 혁신 성과를 이끌어 내는 원인조건 조합은 제약산업 내 기업의 R&D지출이 크고, 연구자 수가 많으며 동시에 규제의 질이 좋지 않은 경우와 제약산업 내 기업의 R&D지출이 크고, 연구자 수가 많으며, 법치주의 지수가 높은 경우로 나타났다. 제약바이오 혁신성과를 높이기 위해서는 R&D지출과 연구자 수와 아울러 규제완화를 추진하거나 혹은 법치주의를 강화하는 정책이 필요하다는 시사점을 제시하였다. This study analyzed the fuzzy set qualitative and comparative analysis method to derive the causal combination of factors affecting the innovation performance of the pharmaceutical industry in OECD countries. In the analysis of 29 OECD countries, the combination of causal conditions explaining innovation performance was derived by using R&D expenditure, the number of researchers, the quality of regulation, and the rule of law as the causal variables and the number of patent applications and export share. As a result, the combination of the causal factors leading to the innovation results of the pharmaceutical industry is that the R&D expenditure of the companies in the pharmaceutical industry is large, the number of researchers is large, the quality of regulation is bad, the R&D expenditure of the companies in the pharmaceutical industry is large, And the index was high. In order to increase the innovation performance of pharmaceutical biotechnology, it is suggested that policies to promote deregulation or strengthen rule of law along with R&D expenditure and number of researchers are needed.
Cho, YuKyeong,Kim, Min-Ji,Kim, Sung-Koo The Korean Society for Biotechnology and Bioengine 2013 KSBB Journal Vol.16 No.5
Ethanol productions were performed by separate hydrolysis and fermentation (SHF) and simultaneous saccharification and fermentation (SSF) processes using seaweed, Enteromorpha intestinalis (sea lettuce). Pretreatment conditions were optimized by the performing thermal acid hydrolysis and enzymatic hydrolysis for the increase of ethanol yield. The pretreatment by thermal acid hydrolysis was carried out with different sulfuric acid concentrations in the range of 25 mM to 75 mM $H_2SO_4$, pretreatment time from 30 to 90 minutes and solid contents of seaweed powder in the range of 10~16% (w/v). Optimal pretreatment conditions were determined as 75 mM $H_2SO_4$ and 13% (w/v) slurry at $121^{\circ}C$ for 60 min. For the further saccharification, enzymatic hydrolysis was performed by the addition of commercial enzymes, Celluclast 1.5 L and Viscozyme L, after the neutralization. A maximum reducing sugar concentration of 40.4 g/L was obtained with 73% of theoretical yield from total carbohydrate. The ethanol concentration of 8.6 g/L of SHF process and 7.6 g/L of SSF process were obtained by the yeast, Saccharomyces cerevisiae KCTC 1126, with the inoculation cell density of 0.2 g dcw/L.
Lee, Yukyeong,Kim, C-Yoon,Lee, Hye Jeong,Kim, Jae Gon,Han, Dong Wook,Ko, Kisung,Walter, James,Chung, Hyung-Min,Schö,ler, Hans R.,Bae, Young Min,Ko, Kinarm Frontiers Media S.A. 2018 Frontiers in cellular neuroscience Vol.12 No.-
<P>Oligodendrocyte progenitor cells (OPCs) are attracting attention as the ideal cell therapy for spinal cord injury (SCI). Recently, advanced reprogramming and differentiation techniques have made it possible to generate therapeutic cells for treating SCI. In the present study, we used directly-induced neural stem cells (DNSCs) from fibroblasts to establish OPCs (DN-OPCs) capable of proliferation and confirmed their OPC-specific characteristics. Also, we evaluated the effect of transplanted DN-OPCs on SCI in rats. The DN-OPCs exhibited an OPC-specific phenotype and electrophysiological function and could be differentiated into oligodendrocytes. In the SCI model, transplanted DN-OPCs improved behavior recovery, and showed engraftment into the host spinal cord with expression of myelin basic protein. These results suggest that DN-OPCs could be a new source of potentially useful cells for treating SCI.</P>
안구 동작 인식 기반 지능형 자동 독서 보조 장치 설계 및 구현
김예린(Yerin Kim),김유경(Yukyeong Kim),문선경(Sunkyung Moon),김대진(Daejin Kim) 대한전자공학회 2024 대한전자공학회 학술대회 Vol.2024 No.6
In this paper, an innovative automatic intelligent automatic reading assistant system is designed for users with limited hand mobility. Utilizing a camera module situated on a reading stand and face detection algorithms, the system tracks user’s eye movements in real-time via a Jetson Nano board. The integration of top and dual bottom servo motors accommodates various book thicknesses, enabling automatic page turning. Also, the face detection and eye tracking algorithm can be applied to electronic books for automatic page turning. Additionally, a smartphone application can be used to monitor a list of reading books and a current page of unfinished books.
홍조류, 갈조류, 녹조류를 이용한 바이오에탄올 생산 및 폐 해조류 슬러리의 중금속 생물흡착
선우인영(InYung Sunwoo),라채훈(ChaeHun Ra),권성진(SeongJin Kwon),허지희(JiHee Heo),김예진(Ye-Jin Kim),김지우(JiWoo Kim),신지호(JiHo Shin),안은주(En-Ju Ahn),조유경(YuKyeong Cho),김성구(Sung-Koo Kim) 한국생물공학회 2014 KSBB Journal Vol.29 No.6
The seaweeds with high carbohydrate ratio Gelidium amansii, Saccharina japonica and Enteromorpha intestinalis were used as red, brown, and green seaweeds, respectively. Thermal acid hydrolysis, enzymatic saccharification and fermentation were carried out using those seaweeds to produce ethanol. The ethanol concentrations from red, brown and green seaweed were 14.8 g/L, 11.6 g/L and 9.9 g/L, respectively. After the production of ethanol, the seaweeds were reused to absorb heavy metal. The maximum biosorption ratio was Cu(II) (89.6%), Cr(III) (82.9%), Ni(II) (66.1%). Cu(II) had the highest affinity with 3 waste seaweeds. Red seaweed was verified the most effective substrates to both process.