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Articles by C. Chen
Total Records ( 4 ) for C. Chen
  Qing-hua Zheng , S. Jiang , F. Zhang , T. Peng and C. Chen
  In this study, we propose a low-delay ALM protocol named TapMulti on Tapestry to achieve scalability and low-delay, . In TapMulti protocol, a delivery tree is designed to reduce end-to-end delay and improve stability of multicast system. This low-delay delivery tree is constructed on Tapestry and it can guarantee a tradeoff between delay and network-traffic load of multicast system by constraining width (maximal out-degree of node in the delivery tree) and depth of the delivery tree. Moreover, the efficient and proportional route mechanism of Tapestry is exploited to decrease the control cost to maintain multicast delivery tree. Simulated results indicate that, compared with other existing ALM approaches on Tapestry, TapMulti is of distinct advantages in aspects of end-to-end delay and control cost.
  Y.L. Liang , C. Chen , Q. Xue , X.J. Lin and Q. Peng
  Soil Organic Carbon (SOC) is one of the key factors affect agricultural production, nutrient availability, soil stability and the flux of greenhouse gases. The comparison of simulated and observed data of SOC and yields for the period 1998-2008 were conducted in hilly and gully areas of loess plateau. Denitrification-Decomposition (DNDC) model was validated using SOC content and crop yield data collected from long-term experimental sites on Loess Plateau in China. The results showed that DNDC was capable of quantifying SOC and crop yield in the agro-ecosystems in this region. In addition, the DNDC model was used to investigate effects of different fertilization managements on SOC content and crop yield dynamics on the three major croplands for 11 years. Simulated results showed that single manure application or combined with nitrogen fertilizer application could significantly enhance the SOC content and crop yield on all three types of cropland (3.16 or 3.53 g C kg-1, 425.04 or 437.08 kg C ha-1 on the slope land, 3.10 or 3.14 g C kg-1, 366.86 or 517.3 kg C ha-1 on the terraced field and 5.72 or 6.55 g C kg-1, 2808.36 or 2940.40 kg C ha-1 on the flat field, separately). No application of any fertilizer neither contributed to enhancing soil fertility nor increased crop yield. Single nitrogen fertilizer application could increase crop yield 333.84 kg C ha-1 on the slope land and 2616.36 kg C ha-1 on the flat field but could not significantly increase the fertility level of top soil. Sometimes, the single nitrogen fertilizer application even decreased 0.02 g C kg-1 on the slope land. Therefore, the application of manure combined with a certain amount of nitrogen fertilizer would be a better management practice to achieve a goal of increasing soil carbon sequestration and food security.
  N.R. Record , A.J. Pershing , J.A. Runge , C.A. Mayo , B.C. Monger and C. Chen
  The validity of computational models is always in doubt. Skill assessment and validation are typically done by demonstrating that output is in agreement with empirical data. We test this approach by using a genetic algorithm to parameterize a biological–physical coupled copepod population dynamics computation. The model is applied to Cape Cod Bay, Massachusetts, and is designed for operational forecasting. By running twin experiments on terms in this dynamical system, we demonstrate that a good fit to data does not necessarily imply a valid parameterization. An ensemble of good fits, however, provides information on the accuracy of parameter values, on the functional importance of parameters, and on the ability to forecast accurately with an incorrect set of parameters. Additionally, we demonstrate that the technique is a useful tool for operational forecasting.
  C. H Hsu , Y. R Pan , Y. D Liao , S. H Wu and C. Chen

The stability, structures and steric hindrances of recombinant RNases 2 and 4 expressed in bacteria were studied by circular dichroism (CD) and NMR techniques, and the results were compared with those of their authentic RNases extracted from oocytes of Rana catesbeiana. Although the overall structures of the recombinant and authentic proteins are almost identical, the extra N-terminal Met residue of the recombinant protein remarkably affects catalytic activity and stability. NMR chemical shift comparison of recombinant RNases and the authentic proteins indicated that the structural differences are mainly confined to the N-terminal helical and S2 anti-parallel β-sheet regions. Significant shift changes for the residues located on the S2 region indicate that the major influences on the structure around the N terminus is due to the loss of the hydrogen bond between Pyr1 and Val95(96) in recombinant RNases 2 and 4. We concluded the apparent steric hindrances of the extra Met to the binding pocket. As well, the affected conformational changes of active residues are attributed to the reduced activities of recombinant RNases. The structural integrity exerted by the N-terminal Pyr1 residue may be crucial for amphibian RNases and the greatest structural differences occur on the network of the Pyr1 residue and S2 β-sheet region.

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