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Articles by Yi Yang
Total Records ( 5 ) for Yi Yang
  Xiaojie Sun , Yuan Wu , Xiao Liang , Yi Yang and Limin Meng
  Future smart grid has been conceived to be able to improve efficiency and stability of the grid operations. Based on the smart meter and advanced mechanism of two-way communications, Energy-Users (EUs) are able to receive real-time signalling (e.g., the electricity price) from the grid and schedule their energy consumption to optimize their objectives of interest correspondingly. Besides the conventional fuel-based energy supply, renewable energy supplies, e.g., solar and wind power, are expected to play important roles in smart grid. Despite their advantages in lowering the electricity-provisioning cost and being environment-friendly, renewable supplies usually suffer from uncontrollable and volatile generations, which result in great fluctuations in their provisioning. Therefore, it is indispensable for EUs equipped with renewable energy suppliers to take a careful tradeoff between exploiting the benefit from the renewable energy and controlling the adversary impact due to its volatility. Based on this motivation, this study aims at jointly optimizing the EU's average energy-acquisition cost as well as its fluctuation. This problem is formulated as a nonconvex optimization problem and this study proposes an efficient Layered Particle Swarm Optimization (L-PSO) algorithm to determine the EU’s optimal scheduling of energy consumptions. Our numerical results show how EU can trade off between benefiting from the renewable supplies and suffering from the associated fluctuation through tuning the weighting-factors.
  Zinan Wang , Dayu Zhao , Yi Yang , Chenglong Liu , Ping Lu , Meng Zhang , Chao Peng , Zhenrong Zhang and Zhengbin Li
  Polarization Nonreciprocity (PN) is one of the most significant error sources in Interferometric Fiber-Optic Gyroscopes (IFOGs). In IFOG applications, PN errors must be effectively suppressed to achieve a low bias drift. Optical compensation is a recently discovered mechanism for suppressing PN errors in IFOGs. The minimal scheme for the optically compensated IFOG is proposed, which has structural complexity even lower than the conventional IFOG’s minimal scheme. In the proposed scheme, optical compensation is achieved by using depolarized light and no polarizer or polarization maintaining device is required. Experimental test targeting the Earth’s rotation rate shows this scheme works stably and achieves a low bias drift of 0.02°/h.
  Li-Yi Ma and Yi Yang
  By integrating the existing website evaluation indexes and website evaluation methods, based on the method of principle component analysis, which is a kind of dimension reduction statistics and commonly used to deal with practical problems of multiple indexes, after deeply investigating the domestic and overseas science and technology service websites, 14 indexes are extracted as the evaluation indexes. Then, from the two aspects of quantitative and qualitative analyses, by using the monitoring results, the 158 famous science and technology service websites of China are assessed and sequenced. The science and technology service websites with better evaluation results will be popularized to the whole China.
  Yan Ning Zhou , William G. Coleman Jr. , Zhaoxu Yang , Yi Yang , Nathaniel Hodgson , Fuxiang Chen and Ding Jun Jin
  In Helicobacter pylori the stringent response is mediated solely by spoT. The spoT gene is known to encode (p)ppGpp synthetase activity and is required for H. pylori survival in the stationary phase. However, neither the hydrolase activity of the H. pylori SpoT protein nor the role of SpoT in the regulation of growth during serum starvation and intracellular survival of H. pylori in macrophages has been determined. In this study, we examined the effects of SpoT on these factors. Our results showed that the H. pylori spoT gene encodes a bifunctional enzyme with both a hydrolase activity and the previously described (p)ppGpp synthetase activity, as determined by introducing the gene into Escherichia coli relA and spoT defective strains. Also, we found that SpoT mediates a serum starvation response, which not only restricts the growth but also maintains the helical morphology of H. pylori. Strikingly, a spoT null mutant was able to grow to a higher density in serum-free medium than the wild-type strain, mimicking the "relaxed" growth phenotype of an E. coli relA mutant during amino acid starvation. Finally, SpoT was found to be important for intracellular survival in macrophages during phagocytosis. The unique role of (p)ppGpp in cell growth during serum starvation, in the stress response, and in the persistence of H. pylori is discussed.
  Yasuharu Takagi , Yi Yang , Ikuko Fujiwara , Damon Jacobs , Richard E. Cheney , James R. Sellers and Mihaly Kovacs
  Myosin Vc is the product of one of the three genes of the class V myosin found in vertebrates. It is widely found in secretory and glandular tissues, with a possible involvement in transferrin trafficking. Transient and steady-state kinetic studies of human myosin Vc were performed using a truncated, single-headed construct. Steady-state actin-activated ATPase measurements revealed a Vmax of 1.8 ± 0.3 s-1 and a KATPase of 43 ± 11 µM. Unlike previously studied vertebrate myosin Vs, the rate-limiting step in the actomyosin Vc ATPase pathway is the release of inorganic phosphate (~1.5 s-1), rather than the ADP release step (~12.0–16.0 s-1). Nevertheless, the ADP affinity of actomyosin Vc (Kd = 0.25 ± 0.02 µM) reflects a higher ADP affinity than seen in other myosin V isoforms. Using the measured kinetic rates, the calculated duty ratio of myosin Vc was ~10%, indicating that myosin Vc spends the majority of the actomyosin ATPase cycle in weak actin-binding states, unlike the other vertebrate myosin V isoforms. Consistent with this, a fluorescently labeled double-headed heavy meromyosin form showed no processive movements along actin filaments in a single molecule assay, but it did move actin filaments at a velocity of ~24 nm/s in ensemble assays. Kinetic simulations reveal that the high ADP affinity of actomyosin Vc may lead to elevations of the duty ratio of myosin Vc to as high as 64% under possible physiological ADP concentrations. This, in turn, may possibly imply a regulatory mechanism that may be sensitive to moderate changes in ADP concentration.
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