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Articles by Wei Xiong
Total Records ( 7 ) for Wei Xiong
  Wei Xiong , Declan Conway , Ian Holman and Erda Lin
  Crop models have been used extensively to assess the impacts of environmental change, but few studies have evaluated their performance at the regional scale. Here, we evaluate the performance of CERES-Wheat (Triticum aestivum L.) in simulating regional spatial and temporal characteristics of wheat production in China. The model uses genetic coefficients of representative cultivars within relatively homogeneous Agro Ecological Zones on a 50- by 50-km grid resolution with supported soil and daily weather inputs. Simulated maturity dates and yields are compared with observations (1998–2000) at 141 experimental agricultural stations, and with county-scale census yields (1980–2000). The model is evaluated with respect to its ability to capture the regional and temporal patterns of yield, measured by statistics including relative root mean square error (RMSE) and the index of agreement (d). Results show that the model captures the spatial patterns of yield variability reasonably well when compared to observed field data (RMSE% = 22.8% and d = 0.85) and census data (RMSE% = 27.0% and d = 0.76). Simulation of interannual variability in national production is very good (RMSE% = 8.2%, and d = 0.85). In spatial terms, simulation of variability varies considerably; good results are achieved in some of the main wheat planting areas, but not in others. The paper ends with a discussion of likely reasons for these differences in performance.
  Wei Wang , Bingwen Wang , Zhuo Liu , Lejiang Guo and Wei Xiong
  In Wireless Sensor Networks (WSNs), since the network consists of low-cost sensor nodes with finite battery power, power efficient strategies must be applied for data transmission in order to prolong the network lifetime. It is important to minimize the total energy consumption in each round so that the network lifetime is maximized. In this study, we have proposed a new energy efficient protocol, named CTPEDCA (Cluster-Based and Tree-Based Power Efficient Data Collection and Aggregation Protocol for WSNs), which using the full distributed in hierarchical WSNs. CTPEDCA is based on clustering and Minimum Spanning Tree (MST) routing strategy for cluster heads. We use the MST to improve the transmission routing mechanism between the cluster heads so that let only one cluster head communicate directly with the faraway base station in each round. The simulation results show that CTPEDCA is better than LEACH; CTPEDCA can more balance the energy consumption of all nodes, particularly as the cluster head nodes in each round and prolong the lifetime of the networks. It is worth to note that our algorithm is very fast, its time complexity is O(ElogV), where V is the set of cluster heads, therefore, the time complexity is small.
  Hongliang Gao , Bingwen Wang , Xiaoya Hu and Wei Xiong
  Network performance is a hot issue in wireless sensor networks. How should the nodes be distributed to achieve good network performance? Many researchers have devised novel energy-efficient solutions to some of the conventional wireless networking problems, such as medium access control, routing, self-organization, bandwidth allocation and so on. In this study, some main performance indexes of wireless sensor networks are studied from a topology viewpoint. We study how to distribute sensor nodes and how many sensor nodes should be used in order to obtain a good network performance. Furthermore we adopt adaptive sleeping Medium Access Control (MAC) protocol SMAC for better energy efficiency. In this study, we build a general simulation platform using NS2 and design three typical topology structures innovatively and then research the network performance of wireless sensor networks in the three kinds of typical topology structure based on the platform. Simulation results verify the rules we have obtained in this study.
  Chao Gao , Xiaoya Hu , Bingwen Wang , Hongliang Gao and Wei Xiong
  In Wireless Sensor Networks (WSNs), since the network consists of low-cost sensor nodes with finite battery power, energy efficient is the primary consideration in algorithm design in order to prolong the network lifetime. Various schemes had been proposed to efficiently store and process sensed data. In this study, a data storage scheme called Cluster Based Data Storage (CBDS) is proposed to reduce the communication cost for transmitting data and to efficiently process data queries. The CBDS uses the clustering architecture to efficiently transmit and store data. To our knowledge, this is the first time using clustering method in data centric storage. The CBDS uses the virtual coordinate instead of geographic location information. So CBDS does not need to use the GPS or other technologies to locate, it also saves energy. Moreover, CBDS does well in handling hot spot problem. Analysis and simulation results show that the CBDS scheme outperforms the GTH-based DCS scheme.
  Wei Xiong , Yubing Yu and Jing Li
  The change of mechanical design requirements is throughout the whole life cycle, if not handled timely and effective, will affect the component quality and mechanical product development speed. Firstly, the traditional quality function deployment is extended to Dynamic Quality Function Deployment (DQFD) in order to adapt to the changing requirements, meanwhile the author builds three-dimensional house of quality as its core tool. According to the vagueness and uncertainty of customer requirements, the author provides the systematic analytical framework of mechanical design requirements based on DQFD combining with grey system theory especially GM (1, N) and calculate the importance of requirements and the relationship between requirement and technology by means of grey relational algorithm and then converted to sequence of technical characteristics importance. Through the application in the design and development of mechanical product in the future, it will be proved to reduce the cost of information collection and improve the accuracy of information processing and improve the quality and credibility of mechanical product and component.
  Lu Feng , Bin Liu , Yanqun Liu , Yuli A. Ratiner , Bo Hu , Dan Li , Xiaolin Zong , Wei Xiong and Lei Wang
  The occurrence of unilateral flagellar phase variation was previously demonstrated in Escherichia coli strains carrying the non-fliC flagellin-specifying locus flk. In this study, we investigated the mechanism involved in this process. By using sequencing and sequence analysis, the flk region between the chromosomal genes yhaC and rnpB was characterized in all described flk-positive E. coli strains, including the H35 strain identified in this study (the other strains used are H3, H36, H47, and H53 strains), and this region was found to contain a putative integrase gene and flanking direct repeats in addition to the flk flagellin-specifying gene flkA and a fliC repressor gene, flkB, indicating that there is a typical genomic islet (GI), which was designated the flk GI. The horizontal transfer potential of the flk GI was indicated by detection of the excised extrachromosomal circular form of the flk GI. By generating fliC-expressing variants of H3 and H47 strains, unilateral flagellar phase variation in flk-positive strains was shown to be mediated by excision of the flk GI. The function of the proposed integrase gene was confirmed by deletion and a complementation test. The potential integration sites of the flk GI were identified. A general model for flagellar phase variation in flk-positive E. coli strains can be expressed as fliCoff + flkAonfliCon + flkAnone. This is the first time that a molecular mechanism for flagellar phase variation has been reported for E. coli.
  Xiao-zhu Tian , Juan Chen , Wei Xiong , Tian He and Qiang Chen
 

In the present study, we investigated the effects of human opiorphin on colonic motility and nociception in mice. In in vitro bioassay, opiorphin (10−6 to 10−4 M) caused colonic contraction in a concentration-dependent manner, which was completely blocked by naloxone and partially attenuated by β-funaltrexamine and naltrindole. Moreover, opiorphin (10−4 M) significantly enhanced the contractile response induced by Met-enkephalin. The data suggested that the effect of opiorphin on colonic contraction may be due to the protection of enkephalins. In in vivo bioassay, intracerebroventricular (i.c.v.) administration of opiorphin (1.25–10 μg/kg) dose- and time-dependently induced potent analgesic effect (ED50 = 3.22 μg/kg). This effect was fully blocked by naloxone and significantly inhibited by co-injection (i.c.v.) with β-funaltrexamine or naltrindole, but not by nor-binaltorphimine, indicating the involvement of both μ- and δ-opioid receptors in the analgesic response evoked by opiorphin. In addition, i.c.v. administration of 5 μg/kg opiorphin produced the comparative effect as 10 μg/kg morphine on the analgesia, suggesting that opiorphin displayed more potent analgesic effect than that induced by morphine.

 
 
 
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