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Jae Hun Cho,Hoon Kim,Sihai Wang,Jaehoon Lee,Hanlim Lee,Seongtaek Hwang,Sungdae Cho,Yunje Oh,Tae-Jin Lee IEEE 2009 IEEE transactions on instrumentation and measureme Vol.58 No.8
<P>We propose and demonstrate a method to provide precise time synchronization in distributed control systems using a boundary clock scheme. The major drawback of the boundary clock scheme is the exponential accumulation of time synchronization error as the number of hops increases. To make the error accumulation linearly increase with the number of hops, we first separate the frequency compensation interval (FCI) and the offset and frequency compensation interval (OFCI) and then separately optimize each interval. To demonstrate the performance of this method, we implemented test benches using Ethernet-linked distributed control systems. We measured the peak-to-peak jitter performance along with the maximum time interval error to assess the short- and long-term stability after several hops in distributed control systems. Our method enables the peak-to-peak jitter to be maintained under 107 ns after seven hops. The experimental results show that the performance of time synchronization is dominated by fast jitter rather than frequency error and wander, and the proposed scheme can be used to improve the time synchronization performance in IEEE 1588-compliant control systems using boundary clock.</P>
Zhi-hao Li,Shang Chu,Ping Wang,Sihai Gao,Shu-gang Li,Xiongwei Yu 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.9
This study examined the effects of differentdoses of irradiation treatments on protein structure anddigestion characteristic of seed-watermelon seed kernelprotein. The results showed that, the molecular structure ofseed-watermelon kernel protein was unfolded after theirradiation treatment, the content of b-sheet structure in thesecondary structure was decreased, while the content ofrandom coil structure increased. The average particle sizeof the protein increased, and the hydrophobic group buriedin the b-sheet structure was exposed hence the surfacehydrophobicity increased. Besides, the surface morphologyof seed-watermelon protein changed from smooth and flatto coarse and concave, the specific surface area in contactwith the aqueous medium increased and its solubilityincreased, the distribution of peptides in the digestabecame wider, and the small molecular weight peptidesgradually increased.