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접착제와 Self-piercing rivet을 이용한 이종재료의 결합강도 평가
이명한(Myeonghan Lee),이명균(Myeonggeun Lee),박영배(Youngbae Park),오수익(Sooik Oh) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Automotive industries are now faced with demands which are improvement of fuel efficiency and reduction of<br/> environmental pollution. For the attainment of these demands, vehicles must be reduced the weight by the substitution of light-weight materials for steel. The change of material, however, causes an important problem with respect to the method of joining. In this paper, strength of several dissimilar materials joining methods such as adhesive bonding and self-piercing rivet was evaluated by performing lap test. And the paper deals with the fracture mode of the adhesive bonded and self-piercing riveted joints.
Bacillus sp. 발효를 이용한 감자 칩의 아크릴아마이드 저감화
이중재(Joongjae Lee),오명근(Myeonggeun Oh),장윤혁(Yoon Hyuk Chang),이영승(Youngseung Lee),진용익(Yong-Ik Jin),장동칠(Dong-Chil Chang),김성환(Sung-Hwan Kim),정윤화(Yoonhwa Jeong),김미숙(Misook Kim) 한국식품영양과학회 2016 한국식품영양과학회지 Vol.45 No.3
본 연구에서는 Bacillus sp.를 이용하여 감자슬라이스를 발효시킨 후 성분을 분석하고, 감자 칩으로 가공하여 색도와 아크릴아마이드 함량을 알아보았다. B. licheniformis, B. methylotrophicus, B. subtilis 각각을 7.5×107~2.7×108 CFU/mL 접종하여 6시간 동안 발효한 결과 균수의 증가는 보이지 않는 유도기였음에도 불구하고 총당 함량은 감소하였으며, 환원당 함량 변화에 영향을 미쳤다. 감자 칩의 색도는 대조구에 비하여 실험구의 L 값이 증가하였으며, a 값과 b 값은 감소하여 감자 칩으로 적합한 색도를 나타내었다. 발효 감자 칩의 아크릴아마이드 함량은 평균 약 94% 감소하였다. The market for potato chips has expanded due to increased consumption of seasoned potato chips. However, the deep-frying process facilitates development of a browning color and formation of acrylamide. The objective of this work was to minimize browning color and acrylamide formation by fermentation prior to deep-frying. Potato slices were fermented by using three Bacillus strains, B. licheniformis (BL), B. methylotrophicus (BM), and B. subtilis, for 6 h at 30°C. In all fermentation groups, contents of total sugars in potato slices decreased. The color of fermented potato chips improved compared to the control. BM potato chips showed the best color values (76.33 in L value, 5.67 in a value, and 34.79 in b value). All fermentation processes reduced levels of acrylamide in deep-fried potato chips. Fermentation of potato slices for 2 h by BL reduced up to 96.1% acrylamide content. It was concluded that the fermentation process can positively affect color development and acrylamide formation.
Heterochiral Doped Supramolecular Coordination Networks for High-Performance Optoelectronics
Shang, Xiaobo,Song, Inho,Lee, Jeong Hyeon,Choi, Wanuk,Ohtsu, Hiroyoshi,Jung, Gwan Yeong,Ahn, Jaeyong,Han, Myeonggeun,Koo, Jin Young,Kawano, Masaki,Kwak, Sang Kyu,Oh, Joon Hak American Chemical Society 2019 ACS APPLIED MATERIALS & INTERFACES Vol.11 No.22
<P>Chiral self-sorting has great potential for constructing new complex structures and determining chirality-dependent properties in multicomponent mixtures. However, it is still of great challenge to achieve high fidelity chiral self-discrimination. Besides, the researches on the coordination polymers or metal-organic frameworks for micro/nanooptoelectronics are still rare due to their low conductivity and difficulty in developing a rapid and simple scale-up synthetic method. Here, heterochiral supramolecular coordination networks (SCNs) were synthesized by the solvothermal reaction of naphthalene diimide enantiomers and cadmium iodide, using the chirality as a synthetic tuning parameter to control the morphologies. Intriguingly, heterochiral micro/nanocrystals exhibited photochromic and photodetecting properties. Furthermore, we also developed a simple and efficient doping method to enhance the conductivity and photoresponsivity of micro/nanocrystals using hydrazine. From experimental and theoretical studies, the mechanism was suggested as follows: the radicals in the singly occupied molecular orbital level of the ligands provide charge carriers that can undergo “through-space” transport between π-π stacked ligands and the electron transfer from adsorbed hydrazine to the SCNs results in reduction of energy gap, leading to increased conductivity. Our findings demonstrate a simple and powerful strategy for implementing coordination networks with redox ligands for micro/nanooptoelectronic applications.</P> [FIG OMISSION]</BR>