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Articles by Hui Sun
Total Records ( 2 ) for Hui Sun
  Peng Yu , Wei Zhou , Yu Zhao , Hui Sun , Jian Liu and Yan Liu
  Keeping the wind power constant is essential for the large-scale integration of wind power into electric power system. In this study, we classify the wind power fluctuation and propose a method of suppressing the fluctuant wind power by an Active-Parallel Hybrid Energy Storage System (APHESS). The APHESS consists of a battery, a supercapacitor and two charge-discharge controllers. By designing the configuration logically, the APHESS obtains the enhanced energy storage performance and the low investment cost. In order to realize the wind power suppression, the method of controlling the APHESS to exchange power precisely with the wind power system is developed in this study. For the purpose of making the battery and supercapacitor balance, respectively different kinds of fluctuation classified in this study, the power within APHESS is allocated reasonably between the battery and the supercapacitor. By the method proposed in this study, the fluctuant wind power can be balanced effectively and the service life of energy storage system can be prolonged.
  Riki Kawaguchi , Jiamei Yu , Patrick Wiita , Jane Honda and Hui Sun
  Plasma retinol-binding protein (RBP), the principal carrier of vitamin A in the blood, delivers vitamin A from liver, the site of storage, to distant organs that need vitamin A, such as the eye, brain, placenta, and testis. STRA6 is a high-affinity membrane receptor for RBP and mediates vitamin A uptake in these target organs. STRA6 is a 74-kDa multi-transmembrane domain protein that represents a new class of membrane transport protein. In this study, we used an unbiased strategy by analyzing >900 random mutants of STRA6 to study its structure and function, and we identified an essential RBP-binding domain in STRA6. Mutations in any of the three essential residues in this domain can almost completely abolish binding of STRA6 to RBP and its vitamin A uptake activity from holo-RBP without affecting its cell surface expression. We have also functionally characterized the mutations in human STRA6 that cause severe birth defects as well as several human polymorphisms. All STRA6 mutants associated with severe birth defects have largely abolished vitamin A uptake activity, consistent with the severe clinical phenotypes. In addition, we have identified a human polymorphism that significantly reduces the vitamin A uptake activity of STRA6. Interestingly, the residue affected by this polymorphism is located in the RBP-binding domain we identified, and the polymorphism causes decreased vitamin A uptake by reducing RBP binding. This study identifies an essential functional domain in STRA6 and a human polymorphism in this domain that leads to reduced vitamin A uptake activity.
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