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( Shi Hui ),장영욱 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Ethylene acrylic acid copolymer(EAA)/cellulose nanofiber(CNF) nanocomposites were successfully prepared by green and simple waterassisted mixing followed by film casting. EAA was dispersed in water neutralized by ammonia, and the stable aqueous dispersion of EAA mixed with CNF water suspension. The morphology, thermal and mechanical properties of the nanocomposites were studied using TEM, DSC, DMA, and tensile testing. The experimental results showed that CNF were homogenously dispersed into the EAA matrix and provided significant reinforcement of the EAA. The presence of a rubbery plateau above the melting temperature of EAA/CNF nanocomposites obtained from DMA indicated that the nanocomposites formed a physically cross-linked structure. The EAA/CNF nanocomposites also exhibited an excellent thermally triggered shape memory effect.
Shi, Hui,Zhong, Shangwei,Mo, Xiaorong,Liu, Na,Nezames, Cynthia D.,Deng, Xing Wang American Society of Plant Biologists 2013 The Plant cell Vol.25 No.10
<P>This study identifies the LONG HYPOCOTYL IN FAR-RED1 (HFR1)– PHYTOCHROME-INTERACTING FACTOR 1 (PIF1) pair as the central transcriptional regulatory module for rapid light-initiated transcriptome changes in imbibed seeds. HFR1 interacts with PIF1 to prevent PIF1 from binding to DNA, promoting light-initiated germination. The functionally antagonistic HFR1–PIF1 pair constructs a fail-safe mechanism for fine-tuning seed germination under low-level illumination.</P>
<i>Arabidopsis</i> DET1 degrades HFR1 but stabilizes PIF1 to precisely regulate seed germination
Shi, Hui,Wang, Xin,Mo, Xiaorong,Tang, Chao,Zhong, Shangwei,Deng, Xing Wang National Academy of Sciences 2015 PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF Vol.112 No.12
<P><B>Significance</B></P><P>How organisms respond to environment changes is a fundamental and intriguing question in biology. Light is the energy resource and a crucial environmental cue for plant major developmental switches, such as seed germination. Studying the underlying mechanism is important for us to understand the basic principles of plant development and improve crop productions. Here we identify DET1 as a novel central repressor of seed germination. We further reveal that seeds use a multilevel regulatory circuit of triple feed-forward loops to sensitively and precisely mediate light-regulated germination. This study provides a comprehensive framework of how light regulates seed germination.</P><P>Seed is an essential propagation organ and a critical strategy adopted by terrestrial flowering plants to colonize the land. The ability of seeds to accurately respond to light is vital for plant survival. However, the underlying mechanism is largely unknown. In this study, we reveal a circuit of triple feed-forward loops adopted by <I>Arabidopsis</I> seeds to exclusively repress germination in dark conditions and precisely initiate germination under diverse light conditions. We identify that de-etiolated 1 (DET1), an evolutionarily conserved protein, is a central repressor of light-induced seed germination. Genetic analysis demonstrates that DET1 functions upstream of long hypocotyl in far-red 1 (HFR1) and phytochrome interacting factor 1 (PIF1), the key positive and negative transcription regulators in seed germination. We further find that DET1 and constitutive photomorphogenic 10 (COP10) target HFR1 for protein degradation by assembling a COP10–DET1–damaged DNA binding protein 1–cullin4 E3 ligase complex. Moreover, DET1 and COP10 directly interact with and promote the protein stability of PIF1. Computational modeling reveals that phytochrome B (phyB)–DET1–HFR1–PIF1 and phyB–DET1–Protease–PIF1 are new signaling pathways, independent of the previously identified phyB-PIF1 pathway, respectively mediating the rapid and time-lapse responses to light irradiation. The model-simulated results are highly consistent with their experimental validations, suggesting that our mathematical model captures the essence of <I>Arabidopsis</I> seed germination networks. Taken together, this study provides a comprehensive molecular framework for light-regulated seed germination, improving our understanding of how plants respond to changeable environments.</P>
Shihui Xiong,Yanhua Li,Yaokun Ye,Jingcheng Wang,Huina Mu,Yuquan Wen 한국항공우주학회 2021 International Journal of Aeronautical and Space Sc Vol.22 No.5
Pyrotechnic separation devices are widely used in space separation systems. However, these devices produce high-frequency, high-amplitude shock responses during operation, which endangers the safety of space systems. Hence, it is imperative to study the shock mechanism and characteristics during the unlocking process of a pyrotechnic separation device. This paper uses LS-DYNA finite element software and experiments to analyze the separation characteristics of the separation nut and predict its shock response, quantitatively decoupling the impact of preload and internal mechanism motion on separation shock. The results indicate that the shock response caused by the impact on the inner sleeve is the primary contributor to the total shock response of the separation nut (approximately 55% of the total response). The shock response caused by the release of the strain energy is very small, accounting for less than 5% of the total shock response. Adjusting the preload force without changing the charge and structure of the separation device did not have a clear impact on reducing the shock. This study shows that the shock of the separation device can be decreased by reducing the impact on the inner sleeve.
Huang SHIHUI,Zhou FENG 한국유통과학회 2021 유통과학연구 Vol.19 No.12
Purpose: This study to seek to answer two research questions in distribution science: what photo decoration cues in online grocery stores could be identified? Could photo decoration cues significantly effect on the affective perception and behavioral intention of consumers? Research design, data, and methodology: his study conducted a laboratory experiment with a 2x2x2 factorial design to validate the proposed research model and test our proposed hypotheses. Research design, data and methodology: Two stages experiments were adopted in this study, among 360 voluntaries who have had an experience of online grocery shopping, 331 valid data had been collected and analyzed using MANOVA and PLS-SEM algorism. Results: (1) both reflective surface and complementary goods layout lead to visual appeal and shopping enjoyment; (2) contrast color usage positively impacts on visual appeal while does not significantly affect shopping enjoyment; (3) consumers’ affective responses positively impact attitudes toward product and store which in turn lead to purchase intention and store loyalty. Implications for research and practice are discussed. Conclusions: Using the media richness theory, visual rhetoric theory and visual design literature as the theoretical foundation, the study provides a solid foundation to comprehend the impact of photo design artifacts on consumers’ affective responses when online consumers shopping online for fresh grocery.
A Study of Wheel Tread Spalling Problem of $DF_{21}$ Locomotive
Weihua, Ma,Shihui, Luo The Korean Society for Railway 2008 International Journal of Railway Vol.1 No.2
$DF_{21}$ diesel locomotive was designed to satisfy the requirement of Kunming Meter track and the 2Co self-guided radial bogie was used to suit the complex curve track. There are totally 12 locomotives was served on the track. The first two locomotives were devotion running on the track since April 2003, the wheel tread splling was occurred on the middle wheel set of the two locomotives after running nearly 150 thousands km on the track of the two locomotives at August 2004. The dynamic analysis was carried out to find the reason. The wheel set longitudinal vibration resonance phenomenon was existed on the locomotive dynamic performance, and this was caused by the too big longitudinal stiffness of the journal box bar on the middle wheel set. Wheel set longitudinal vibration resonance maybe an important reason of lead to wheel tread spalling. The corresponding mend methods were put forward from the point of view of wheel set longitudinal vibration resonance. All the wheel tread of the 12 locomotives on the middle wheel set were in good condition and not occurred the wheel tread spalling after the mend till December 2007 after 350 thousands km were finished. The mechanism of the wheel tread splling and corresponding mend method was discussed in detail in this paper.
Hierarchical Identity-based Broadcast Encryption Scheme from LWE
Chunli Yang,Shihui Zheng,Licheng Wang,Xiuhua Lu,Yixian Yang 한국통신학회 2014 Journal of communications and networks Vol.16 No.3
A hierarchical identity-based broadcast encryption (HIBBE)scheme is an identity-based broadcast encryption (IBBE)scheme in a hierarchical environment. In order to obtain secure HIBBEschemes in the quantum era, we propose an H-IBBE schemebased on the learning with errors problemassumption.Our schemeachieves indistinguishability from random under adaptive chosenplaintextand chosen-identity attacks in the random oracle model.