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Articles by S. Li
Total Records ( 5 ) for S. Li
  W. Li , G. Wang , X. Wang and S. Li
  The scheduling algorithm for optimistic replication is important, because it has an extreme effect on replication performance. However, most of the scheduling algorithms are designed for a conventional hard disk device with mechanical disk arms. It may be inefficient when the flash memory which possesses both a higher read/write performance and random access rate is equipped. This study proposed a new flash memory-based scheduling algorithm for optimistic replication: FBSA. It parallelized the write requests on the slave node according to the semantic dependency, thus, full drove the flash memory and improved replication performance. The FBSA was fully implemented under a popular open-source DBMS-MySQL and was proved to show dramatic performance improvement compared with the original scheduling algorithm based on the same hardware and software configurations.
  Z. Zhang , S. Li and J. Zhou
  Estimate request service demand is vital for resource management and capacity planning in large web servicing system. Most existing works assume the service demand is load-independent. This study showed that it is not the case for modern processors with Dynamic Frequency Scaling (DFS) and Simultaneous Multi-Threading (SMT) capabilities. Through experiments in a Xeon processor under Linux, this study showed that the CPU demand can be modeled as a polynomial function of CPU utilization with degree 2 or 3. This study proposed a quadratic programming based optimization method to infer the polynomial coefficients from readily available CPU utilization and response time data. Comparing with widely used regression method, proposed optimization method can reduce the error by more than half in most cases. Proposed method is also more accurate than the existing load-dependent estimation method, particularly in workload of requests with different sizes.
  J.Y. Bai , W. Li , S. Li , W.P. Zhang , C.Q. Gu , X.Y. Hu and G.F. Cheng
  To study the cross-application of the Antibodies (Abs) of Homo sapiens and duck origins which provides the fundamentals for potential application of related Abs, we analyzed their differences by molecular biology techniques and preliminary application in peripheral blood. The similarities of deduced aa sequences of CD8α gene reached to about 32% between cherry valley duck and homo sapiens whereas the extracellular regions reached to about 30%. The result showed the obvious differences in protein hydrophilicity, antigenicity and the possibilities of CD8α extracellular region. This study successfully expressed the extracellular region of cherry valley ducks CD8α (ERCVCD8) sequence and prepared for corresponding Abs. The percentage of control group (group 1) CD8+lymphocytes was relatively stable during different phases of the post-infected with DPV when using rabbit anti-the recombinant protein of extracellular region of cherry valley ducks CD8α (rCVERCD8) serum but the percentage of CD8+lymphocytes was unstable when using anti-Homo sapiens CD8α mAb. When rabbit anti-rCVERCD8 serum was used, the percentage of infection group (group 2) CD8+lymphocytes showed regularity however that of CD8+lymphocytes using rabbit anti-Homo sapiens CD8α Abs was irregular. This study indicats that the identification of cherry valley ducks CD8+lymphocytes using anti-Homo sapiens CD8α Abs has its limitations.
  A. Farenhorst , S. K. Papiernik , I. Saiyed , P. Messing , K. D. Stephens , J. A. Schumacher , D. A. Lobb , S. Li , M. J. Lindstrom and T. E. Schumacher
  The sorption of 2,4-D and glyphosate herbicides in soil was quantified for 287 surface soils (0–15 cm) collected in a 10 x 10 m grid across a heavily eroded, undulating, calcareous prairie landscape. Other variables that were determined included soil carbonate content, soil pH, soil organic carbon content (SOC), soil texture, soil loss or gain by tillage and water erosion, and selected terrain attributes and landform segments. The 2,4-D sorption coefficient (Kd) was significantly associated with soil carbonate content (–0.66; P < 0.001), soil pH (–0.63; P < 0.001), and SOC (0.47; P < 0.001). Upper slopes were strongly eroded and thus had a significantly greater soil carbonate content and less SOC compared with lower slopes that were in soil accumulation zones. The 2,4-D Kd was almost twice as small in upper slopes than in lower slopes. The 2,4-D Kd was also significantly associated with nine terrain attributes, particularly with compounded topographic index (0.59; P < 0.001), gradient (–0.48; P < 0.001), mean curvature (–0.43; P < 0.001), and plan curvature (–0.42 P < 0.001). Regression equations were generated to estimate herbicide sorption in soils. The predicted power of these equations increased for 2,4-D when selected terrain attributes were combined with soil properties. In contrast, the variation of glyphosate sorption across the field was much less dependent on our measured soil properties and calculated terrain attributes. We conclude that the integration of terrain attributes or landform segments in pesticide fate modeling is more advantageous for herbicides such as 2,4-D, whose sorption to soil is weak and influenced by subtle changes in soil properties, than for herbicides such as glyphosate that are strongly bound to soil regardless of soil properties.
  Y. Liu , W. Jiang , S. Li , Z.P. Cheng , D. Song , X.J. Zhang and F.S. Li
  Novel Fe3O4/carbon nanotubes (CNTs) nanocomposites were prepared by a polyol-medium solvothermal method using oleate as an interlinker molecule and characterized via X-ray diffractometry, X-ray photoelectron spectroscopy, transmission electron microscopy and vibration sample magnetometry. Results indicated that the Fe3O4 nanoparticles were successfully attached on the surface of CNTs and the nanocomposites were proved to be superparamagnetic with saturation magnetization of 50.0 emu g−1. A proposed formation mechanism of the magnetic nanocomposites was presented.
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