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Search Results: 1 - 10 of 58812 matches for " XIA Guo-fu "
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Effects of three compounds extracted from Tripterygium wilfordii Hook on angiogenesis in chick chorioallantoic membrane
Guo-fu ZHU
Zhong Xi Yi Jie He Xue Bao , 2007,
Abstract: Objective: To investigate the effects of three compounds extracted from Tripterygium wilfordii Hook (TW) on angiogenesis in the chick chorioallantoic membrane (CAM).Methods: Fifty fresh Hongkong Mahua chicken eggs were divided into five groups: PBS-treated group, TW1-, TW2- and TW3-treated groups and Rg3-treated group. After disinfection, the eggs were incubated for six days in a constant temperature box with the temperature being controlled within 37.8 ℃, then exposed CAM, laid the filter papers with specimen on the CAM, and the eggs were incubated for another two days. CAM was fixed with the mixture of methyl alcohol and acetone at room temperature for about 15 min, and then cutting the CAM, taking photos and observing the angiogenesis in the CAM.Results: There were many CAM vessels in the PBS-treated group and the blood vessel net could be seen clearly. The number of CAM vessels in the TW1-, TW2- and TW3-treated groups (10 μg/egg) was much less than that in the PBS-treated group. Furthermore, the frame of the vessels was not clear, and the color was obscure. Inhibition rates of angiogenesis in the TW1-, TW2- and TW3-treated groups were 80%, 60% and 100% respectively, while the inhibition rate of angiogenesis in the Rg3-treated group (10 μg/egg) was only 10%.Conclusion: TW1, TW2 and TW3 can obviously restrain the angiogenesis in CAM and still need further study.
Multi-task coalition parallel generation algorithm based on dimension partition strategy and immunity

SU Zhao-pin,JIANG Jian-guo,XIA Na,ZHANG Guo-fu,

系统工程理论与实践 , 2008,
Abstract: 设计了一种基于维数的Agent能力划分策略,提出"子Agent"概念;在此基础上设计了一种基于三维二进制编码的免疫算法求解多任务联盟并行生成问题,并对疫苗采取了自适应提取的策略.实验结果证明了该算法的有效性.
A Task Oriented Coalition Formation Strategy Based on Rational Agents

JIANG Jian-Guo,ZHANG Guo-Fu,XIA Na,SU Zhao-Pin,

自动化学报 , 2008,
Abstract: Coalition formation is a key topic in multi-agent systems.It mainly deals with the coalition's utility distri- bution among agents according to their preferences.Existing strategies have an inextricable free-rider problem,which can not clearly distinguish each agent's contribution and may result in coalition's potential instability.In order to tackle the short- age above,a novel coalition formation strategy based on ratio- nai agents is presented,which is restricted by the principle of impartial distribution and non-jealous standard,and improves the justice of allocation for additional utility.In superadditive task oriented domains,the proposed strategy can reach a global- optimal coalition,which is stable with Nash equilibrium.
Agent-behavior strategy in serial multi-task coalition formation

JIANG Jian-guo,SU Zhao-pin,ZHANG Guo-fu,XIA Na,
,苏兆品,张国富,夏 娜

控制理论与应用 , 2008,
Abstract: Agent-coalition is an important approach to agent-coordination and cooperation, in which the coalition formation is a key topic. Existing researches are restricted in single-task environments, and the results are not applied to multi-task environments. In this paper, a new agent behavior strategy in serial multi-task coalition formation for problemsolving is presented. The conclusion shows that the agent-task selection is a Markov Decision Process. The Q-learning is used to optimize the behavior strategy for a single agent, and the cooperative multi-agent reinforcement learning improves the learning rate. Experiments prove that the strategy can effectively and serially form coalitions for multi-task.
可动性I型内含子 Mobile Group I Introns
遗传 , 1993,
Abstract: 真核生物绝大多数基因初始转录物的后加工过程涉及内含子(intron,亦称间插序列IVS)的切除和外显子(exon)的连接。自从Kruger和Cech等人首次发现嗜热四膜虫(Tetrahymena thermophila)大亚基rRNA的间插序列能够催化自身切除和外显子连接以来,自我剪接内含子(self splicing intron)及其他有催化功能的RNA的例子在不断增多.RNA催化功能的发现强
Intrusion Detection Technology Based on AdaBoost
基于AdaBoost 的入侵检测技术探索与分析

YIN Guo-Fu,

计算机系统应用 , 2012,
Abstract: This paper illuminates the intrusion detection system monitoring process and puts forward that in intrusion detection methods of analysis by the iterative AdaBoost framework, in each iteration, the algorithm produces a belt of the weight values classifier, the iterative end into multiple classifier. Finally, the classifier are weighted joint to get a higher rate of classifier, and hence overcome classification algorithm USES a single produced to meet the requirements of the recognition system defect, so as to improve the system to attack rate, reduce false alarm rate of purpose, in KDD99 were selected as the experimental data. The simulation experiments show that the method is accurate in early warning detection.
Research on mobile communication multimedia sensor distributed cross-layer interaction technology

YIN Guo-fu,

计算机应用研究 , 2012,
Abstract: For wireless multimedia sensor network bandwidth and real-time, high demand, this paper built a kind to be based on energy optimization and cross-layer interactive distributed multi path routing technology and application in the field of mobile communication. The first, it used genetic algorithm to optimize the node to transmit multimedia data establishment of residual energy of nodes energy consumption prediction model, and then according to the perception of the energy based cross-layer coordination work system, with lesser cost in dynamic wireless network topology optimal path. Simulation experiment and mathematical analysis show that, the technology can effectively support the real-time mobile video communication, suitable for computation ability, memory ability and energy constrained wireless multimedia sensor networks.
Influence of n-type layer structure on performance and light-induced degradation of n-i-p microcrystalline silicon solar cells

Lu Peng,Hou Guo-Fu,Yuan Yu-Jie,Yang Rui-Xia,Zhao Ying,

物理学报 , 2010,
Abstract: A series of n-i-p microcrystalline silicon thin film solar cells with different values of crystalline volume fraction Xc of n-type layers are prepared by radio frequency plasma enhanced chemical vapor deposition. It is found that the structure of intrinsic layer is strongly dependent on the structure of n-type layer, especially the incubation layer thickness at n/i interface and Xc of intrinsic layer. This series of solar cells were light-soaked under 100 mW/cm2 for 400 h. The experiment results demonstrate that the solar cell with the highest Xc of intrinsic layer (Xc(i)=65%) has the lowest light-induced degradation ratio. Then the solar cell with n-type layer deposited in an amorphous silicon/microcrystalline silicon transition region (Xc(i) =54%) is light-soaked under the irradiations of white light, red light and blue light with the same light intensities, separately. After 400 h light-soaking, the light degradation ratio is only 2% for the red light irradiation, while it is 8% for the blue light irradiation.
Thermodynamics of carbonyl sulfide poisoning on F-T synthesis catalyst

HOU Chao-peng,XIA Guo-fu,LI Ming-feng,NIE Hong,LI Da-dong,

燃料化学学报 , 2012,
Abstract: Thermodynamics of poisoning on F-T synthesis catalyst with carbonyl sulfide were calculated according to some thermodynamic data and related software.Poisoning of Ru,Fe and Co can occur spontaneously under the conditions of F-T synthesis reaction because of the low negative value of ΔG thermodynamically.Ruthenium in Ru-based F-T synthesis catalyst can be poisoned by the COS on 10-9 level.There are many types of Fe and Co sulfide generated in the poisoning reactions.Their equilibrium constants are much different for different reactions,and their necessary concentrations of COS are also different.As the active phases of the Fe-based F-T synthesis catalyst are complex,it is feasible to develop some sulfur resistant catalysts.And for the Co catalyst,the characteristics of F-T synthesis reaction and the modification of catalysts may contribute to the development of sulfur tolerant catalyst possibly.
Effect of Low-Frequency rTMS on Aphasia in Stroke Patients: A Meta-Analysis of Randomized Controlled Trials
Cai-Li Ren, Guo-Fu Zhang, Nan Xia, Chun-Hui Jin, Xiu-Hua Zhang, Jian-Feng Hao, Hong-Bo Guan, Hong Tang, Jian-An Li, De-Liang Cai
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0102557
Abstract: Background Small clinical trials have reported that low-frequency repetitive transcranial magnetic stimulation (rTMS) might improve language recovery in patients with aphasia after stroke. However, no systematic reviews or meta-analyses studies have investigated the effect of rTMS on aphasia. The objective of this study was to perform a meta-analysis of studies that explored the effects of low-frequency rTMS on aphasia in stroke patients. Methods We searched PubMed, CENTRAL, Embase, CINAHL, ScienceDirect, and Journals@Ovid for randomized controlled trials published between January 1965 and October 2013 using the keywords “aphasia OR language disorders OR anomia OR linguistic disorders AND repetitive transcranial magnetic stimulation OR rTMS”. We used fixed- and random-effects models to estimate the standardized mean difference (SMD) and a 95% CI for the language outcomes. Results Seven eligible studies involving 160 stroke patients were identified in this meta-analysis. A significant effect size of 1.26 was found for the language outcome severity of impairment (95% CI = 0.80 to 1.71) without heterogeneity (I2 = 0%, P = 0.44). Further analyses demonstrated prominent effects for the naming subtest (SMD = 0.52, 95% CI = 0.18 to 0.87), repetition (SMD = 0.54, 95% CI = 0.16 to 0.92), writing (SMD = 0.70, 95% CI = 0.19 to 1.22), and comprehension (the Token test: SMD = 0.58, 95% CI = 0.07 to 1.09) without heterogeneity (I2 = 0%). The SMD of AAT and BDAE comprehension subtests was 0.32 (95% CI = ?0.08 to 0.72) with moderate heterogeneity (I2 = 32%,P = 0.22). The effect size did not change significantly even when any one trial was eliminated. None of the patients from the 7 included articles reported adverse effects from rTMS. Conclusions Low-frequency rTMS with a 90% resting motor threshold that targets the triangular part of the right inferior frontal gyrus (IFG) has a positive effect on language recovery in patients with aphasia following stroke. Further well-designed studies with larger populations are required to ascertain the long-term effects of rTMS in aphasia treatment.
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