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Assembly and Densification of Nanowire Arrays via Shrinkage
Bang, Jaehoon,Choi, Jonghyun,Xia, Fan,Kwon, Sun Sang,Ashraf, Ali,Park, Won Il,Nam, SungWoo American Chemical Society 2014 NANO LETTERS Vol.14 No.6
<P>Chemically synthesized semiconductor nanowires (NWs) have demonstrated substantial promise for nanoelectronics, nanoenergy, and nanobiotechnology, but the lack of an effective and controllable assembly process has limited the wide adoption of NWs in these areas. Here we demonstrate a facile, robust, and controllable approach to assembling and densifying a parallel array of NWs using shrinkable shape memory polymers. Using thermal-induced shrinkage of polystyrene, we were able to successfully assemble and densify NW arrays up to close-packing and, furthermore, achieve tunable density (up to ∼300% amplification of density) by controlling the shrinkage process. We also demonstrate scalable assembly and densification of NWs on a 2.5 × 6 inch scale to explore the manufacturability of the shrink-induced assembly process. Finally, we demonstrate the successful transfer of the shrink-assembled NW arrays onto various 2-dimensional and 3-dimensional substrates without compromising the integrity of NW assembly and density.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/nalefd/2014/nalefd.2014.14.issue-6/nl500709p/production/images/medium/nl-2014-00709p_0005.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nl500709p'>ACS Electronic Supporting Info</A></P>
Choi, Sun Young,Ko, Eun Jung,Lee, Yong Hee,Kim, Byung Gyu,Shin, Hyun Jung,Seo, Dae Bang,Lee, Sang Jun,Kim, Beom Joon,Kim, Myeung Nam Informa Healthcare 2014 Journal of cosmetic and laser therapy Vol.16 No.3
<P><I>Background</I>: Experimental and clinical trials have indicated that dietary supplements can have beneficial effects on skin health. <I>Objective</I>: We investigated to evaluate the effect of daily collagen peptide (CP) supplement on skin properties. <I>Methods</I>: Thirty-two healthy volunteers were randomized to receive either no supplement (Group A), CP 3 g (Group B), CP 3 g, and vitamin C 500 mg (Group C), or vitamin C 500 mg (Group D) daily for 12 weeks. Skin properties evaluated included hydration, transepidermal water loss (TEWL), and elasticity using a corneometer, tewameter, and cutometer, respectively. <I>Results</I>: Changes from baseline in the corneometer were statistically significant between Groups A and B (<I>p</I> = 0.011) and Groups A and C (<I>p</I> = 0.004). There were statistically significant differences in cutometer from baseline between Groups A and B (<I>p</I> = 0.005) and Groups A and C (<I>p</I> = 0.015). There was no significant difference from baseline in the corneometer and cutometer between Groups B and C. The greatest changes in TEWL from baseline were seen in Group B, and the second greatest changes were seen in Group C. <I>Conclusions</I>: Daily CP supplementation may improve skin hydration and elasticity, but concomitant intake of low-dose vitamin C did not enhance the effect of CP on skin properties.</P>
Attitude Dynamics Model-Based Gyroless Attitude Estimation for Agile Spacecraft
Sung-Hoon Mok,SooYung Byeon,Hyochoong Bang,Yoonhyuk Choi 제어로봇시스템학회 2018 제어로봇시스템학회 국제학술대회 논문집 Vol.2018 No.10
With increasing demand for high-agility spacecraft, the importance of accurate attitude estimation in high-agility condition is gradually increasing. In previous high-cost spacecraft missions, high-quality gyroscopes were able to be employed and the conventional gyro-based Kalman filter has provided accurate attitude estimates. However, in low-cost missions such as CubeSat missions, high-quality gyroscopes usually cannot be adopted due to its expensive price and large size/power/mass, and this leads to performance degradation in high-agility condition. This proceeding presents a simple example that illustrates how high-agility condition induces performance degradation in a classical gyro-based Kalman filter framework. Then, an alternative attitude estimation method that is based on a model-based gyroless Kalman filter framework is proposed. Numerical results demonstrate that the proposed gyroless filter could exhibit comparable attitude estimation performance, compared to the gyro-based filter, when gyro performance belongs to an industrial grade (such as MEMS gyros). The proposed gyroless filter could be implemented as a main attitude estimation method or as a backup estimation method, depending on available gyros’ performance.
Sung Min Bae,Hyun Na Koo,Tae Young Shin,Jae Bang Choi,Jae Young Choi,Kwang Sik Lee,Jong Yul Roh,Yeon Ho Je,Byung Rae Jin,Sung Sik Yoo,Jae Su Kim,Young In Kim,In Joong Yoon,Soo Dong Woo 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
The Classical Swine Fever Virus (CSFV) is a member of the Pestivirus genus of the Flaviviridae. The genome of CSFV is a positive single-stranded RNA molecule 12.3 kb and contains a single large open reading frame (ORF). The polyprotein composed of eight nonstructural and four structural proteins (nucleocapsid protein C and three envelope glycoprotein E0, E1 and E2). E2, the most immunogenic of the CSFV glycoproteins, induces a protective immune response in swine. To determine the characteristics of the CSFV, LOM strain, we investigated the nucleotide sequence of the glycoprotein E0, E1 and E2. Comparison of the LOM with the other strains revealed nucleotide sequence identity ranging from 97 to 98%. Expression of the glycoprotein E2 was identified by SDS-PAGE and Western blot analysis using anti-CSFV E2 monoclonal antibodies in Sf21 cells. The expression levels of glycoprotein E2 were observed from day 3 and 5 days maximum. In addition, its expression efficiency by media and cell line was investigated. The result showed that High-Five cells and Grace’s insect media for Sf21 were the best conditions for the expression of the glycoprotein E2.