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Search Results: 1 - 10 of 11337 matches for " CAI Yuanli "
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Pulse-Width Pulse-Frequency Based Optimal Controller Design for Kinetic Kill Vehicle Attitude Tracking Control  [PDF]
Xingyuan Xu, Yuanli Cai
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.25075
Abstract: The attitude control problem of the kinetic kill vehicle is studied in this work. A new mathematical model of the kinetic kill vehicle is proposed, the linear quadratic regulator technique is used to design the optimal attitude controller, and the pulse-width pulse-frequency modulator is used to shape the continuous control command to pulse or on-off signals to meet the requirements of the reaction thrusters. The methods to select the appropriate parameters of pulse-width pulse-frequency are presented in detail. Numerical simulations show that the performance of the LQR/PWPF approach can achieve good control performance such as pseudo-linear operation, high accuracy, and fast enough tracking speed.
Seeding and Harvest: A Framework for Unsupervised Feature Selection Problems
Gang Chen,Yuanli Cai,Juan Shi
Sensors , 2013, DOI: 10.3390/s130100292
Abstract: Feature selection, also known as attribute selection, is the technique of selecting a subset of relevant features for building robust object models. It is becoming more and more important for large-scale sensors applications with AI capabilities. The core idea of this paper is derived from a straightforward and intuitive principle saying that, if a feature subset (pattern) has more representativeness, it should be more self-organized, and as a result it should be more insensitive to artificially seeded noise points. In the light of this heuristic finding, we established the whole set of theoretical principles, based on which we proposed a two-stage framework to evaluate the relative importance of feature subsets, called seeding and harvest (S&H for short). At the first stage, we inject a number of artificial noise points into the original dataset; then at the second stage, we resort to an outlier detector to identify them under various feature patterns. The more precisely the seeded points can be extracted under a particular feature pattern, the more valuable and important the corresponding feature pattern should be. Besides, we compared our method with several state-of-the-art feature selection methods on a number of real-life datasets. The experiment results significantly confirm that our method can accomplish feature reduction tasks with high accuracy as well as low computing complexity.
A Reliable Energy-Efficient Multi-Level Routing Algorithm for Wireless Sensor Networks Using Fuzzy Petri Nets
Zhenhua Yu,Xiao Fu,Yuanli Cai,Mehmet C. Vuran
Sensors , 2011, DOI: 10.3390/s110303381
Abstract: A reliable energy-efficient multi-level routing algorithm in wireless sensor networks is proposed. The proposed algorithm considers the residual energy, number of the neighbors and centrality of each node for cluster formation, which is critical for well-balanced energy dissipation of the network. In the algorithm, a knowledge-based inference approach using fuzzy Petri nets is employed to select cluster heads, and then the fuzzy reasoning mechanism is used to compute the degree of reliability in the route sprouting tree from cluster heads to the base station. Finally, the most reliable route among the cluster heads can be constructed. The algorithm not only balances the energy load of each node but also provides global reliability for the whole network. Simulation results demonstrate that the proposed algorithm effectively prolongs the network lifetime and reduces the energy consumption.
Double-Peakon Solutions of Two Four-Component Camassa-Holm Type Equations  [PDF]
Yuanli Li, Qilao Zha
Journal of Applied Mathematics and Physics (JAMP) , 2016, DOI: 10.4236/jamp.2016.47138

This paper is contributed to study two new integrable four-component systems reduced from a multi-component generation of Camassa-Holm equation. Some double peakon solutions of both systems are described in an explicit formula by the method of variation of constant for ordinary differential equations. These double peakon solutions are established in weak sense. The dynamic behaviors of the obtained double peakon solutions are illustrated by some figures.

China's public health-care system: facing the challenges
Bulletin of the World Health Organization , 2004, DOI: 10.1590/S0042-96862004000700011
Abstract: the severe acute respiratory syndrome (sars) crisis in china revealed not only the failures of the chinese health-care system but also some fundamental structural deficiencies. a decentralized and fragmented health system, such as the one found in china, is not well-suited to making a rapid and coordinated response to public health emergencies. the commercial orientation of the health sector on the supply-side and lack of health insurance coverage on the demand-side further exacerbate the problems of the under-provision of public services, such as health surveillance and preventive care. for the past 25 years, the chinese government has kept economic development at the top of the policy agenda at the expense of public health, especially in terms of access to health care for the 800 million people living in rural areas. a significant increase in government investment in the public health infrastructure, though long overdue, is not sufficient to solve the problems of the health-care system. china needs to reorganize its public health system by strengthening both the vertical and horizontal connections between its various public health organizations. china's recent policy of establishing a matching-fund financed rural health insurance system presents an exciting opportunity to improve people's access to health care.
Study on Optimization of Phase Offset at Adjacent Intersections
Yuanli GU,Lei Yu
International Journal of Intelligent Systems and Applications , 2010,
Abstract: Optimization of the phase offset at adjacent intersections is the key parameter regarding coordinated control of traffic signal for adjacent intersections, which decides the effect of the coordinated control for adjacent intersections. According to characters of saturated traffic flow of Chinese urban road, this thesis establishes a model for optimization of phase offset for adjacent interactions and finds a solution from such model by adopting genetic algorithm. The model is verified by actual traffic flow datum of two adjacent signal intersections on Changan Avenue. Then a comparison is made between the optimization result of such model and that of the existing mathematical method and SYNCHRO model, which indicates that the model established by this thesis can reduce the delay suffered by vehicles at the intersections and increase the traffic efficiency of the intersections.
Molecular Dynamics Studies on 3D Structures of the Hydrophobic Region PrP(109-136)
Jiapu Zhang,Yuanli Zhang
Quantitative Biology , 2013, DOI: 10.1093/abbs/gmt031
Abstract: Prion diseases caused by the conversion from a soluble normal cellular prion protein into insoluble abnormally folded infectious prions, are invariably fatal and highly infectious degenerative diseases that affect a wide variety of mammalian species. The palindrome and the Glycine-rich conserved segment in the hydrophobic region 109-136 control the conversion from normal prion protein to form into diseased prions. This paper gives detailed reviews on the 109-136 region and presents the studies of its 3D structures and structural dynamics.
Molecular dynamics studies on the NMR and X-ray structures of rabbit prion protein wild-type and mutants
Jiapu Zhang,Yuanli Zhang
Quantitative Biology , 2013, DOI: 10.1016/j.jtbi.2013.10.005
Abstract: Prion diseases are invariably fatal and highly infectious neurodegenerative diseases that affect a wide variety of mammalian species such as sheep, goats, mice, humans, chimpanzees, hamsters, cattle, elks, deer, minks, cats, chicken, pigs, turtles, etc. These neurodegenerative diseases are caused by the conversion from a soluble normal cellular protein into insoluble abnormally folded infectious prions and the conversion is believed to involve conformational change from a predominantly alpha-helical protein to one rich in beta-sheet structure. Such conformational changes may be amenable to study by molecular dynamics (MD) techniques. For rabbits, classical studies show they have a low susceptibility to be infected, but in 2012 it was reported that rabbit prion can be generated (though not directly) and the rabbit prion is infectious and transmissible (Proceedings of the National Academy of Sciences USA 109(13): 5080-5). This paper studies the NMR and X-ray molecular structures of rabbit prion protein wild-type and mutants by MD techniques, in order to understand the specific mechanism of rabbit prion protein and rabbit prions.
Determination of gabapentin using capillary electrophoresis with laser-induced fluorescence detection

CAI Yuanli,YANG Jiajia,WANG Yufei,BAI Keke,LI Hui,

色谱 , 2010,
Abstract: A novel method for the determination of gabapentin (an antiepileptic drug) has been developed using capillary electrophoresis with laser-induced fluorescence detection (LIFD). Gabapentin was first derived by 4-chloro-7-nitrobenzofurazan (NBD-Cl) and baseline separated within 6 min with a running buffer consisting of 10 mmol/L borate sodium and 10 mmol/L sodium dodecyl sulfate (pH 9.75). The linear range of this method was 0.01~10 mg/L (r=0.9997) with the limit of detection (LOD) of 2 μg/L and the limit of quantification (LOQ) of 10 μg/L. The average recoveries were 100.2%~103.1% with the relative standard deviation (RSD) of 0.15%~1.00%. This method is fast, sensitive, accurate and reliable, and it has been used successfully for the quality assessment of gabapentin drug products.
The Cost-Benefit Analysis for Bananas Diversity Production in China Foc. Zones  [PDF]
Linbing Xu, Bingzhi Huang, Yuanli Wu, Yonghong Huang, Tao Dong
American Journal of Plant Sciences (AJPS) , 2011, DOI: 10.4236/ajps.2011.24067
Abstract: Over 50 years ago, banana export plantations in Panama were ruined by Fusarium wilt race 1 (Foc. R1) since the popular cultivar Gros Michel is susceptible to Foc. R1 [1]. Fortunately, the resistant cultivar Cavendish replaced Gros Michel as the world biggest commercial fruit after ten years’ research and development. Due to its good economic profit, banana industry develops very fast recently in China. Unfortunately, Fusarium oxysporum f. sp. cubense tropical race 4 (TR4) brought disaster to Cavendish plantation since 1996. Most of traditional banana planting zones of Guangdong and Hainan provinces were infected by Foc. TR4 to the end of 2009. In order to fight against Foc. TR4, here we tried to investigate the cost-benefit and disease resistance of six banana cultivars (Cavendish Baxijiao, Dajiao, Guangfen No. 1, Fenzha No. 1, Gongjiao, Haigongjiao) planted in China Foc. Zones. Comparisons were conducted on their economic characteristics, cost, benefit, as well as the advantage and disadvantage and their application in rota-tion. Generally, supposing the investment of $ 4400/ha, the banana plantation attains a good economic profit as $ 2200/ha. Rotation of these cultivars can maintain the biodiversity as well as improve the sustainable development of banana industry.
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