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Search Results: 1 - 10 of 159649 matches for " ZHAO Xing-Li "
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Location Management Methods for the Third-Generation Mobile System
第三代移动通信系统中的位置管理方法

LIU Xing-li,LIN Jin-zhao,HE Fang-bai,
刘兴丽
,林金朝,何方白

重庆邮电大学学报(自然科学版) , 2001,
Abstract: 综述了现在的移动通信系统,尤其是GSM系统中使用的主要定位规程.探讨了位置更新对无线资源及MSC/VLR处理能力的影响.建议了第三代移动通信系统中可能采用的几种位置管理方法.
Secondary metabolites from Bipolaris setariae NY1 strain
狗尾草平脐蠕孢NY1菌株的次级代谢产物分析

ZHAO Xing-Li,NIU Yong-Chun,DENG Hui,LUO Du-Qiang,
赵杏利
,牛永春,邓晖,罗都强

菌物学报 , 2013,
Abstract: 为进一步研究和利用具有杂草生防潜力的狗尾草平脐蠕孢Bipolaris setariae菌株NY1,对其次级代谢产物进行了分离与结构鉴定。从菌株NY1的大米发酵的乙酸乙酯提取物中分离到7个化合物,通过波谱分析将其分别鉴定为:邻苯二甲酸二异壬酯,麦角甾-5,7,22-三烯-3β-醇,5α,8α-过氧化麦角甾-6,22-二烯-3β-醇,6-甲基苯-1,2,4-三酚,3-脱羟基蛇孢菌素A,邻羟基苯甲醛,蛇孢菌素I。其中3-脱羟基蛇孢菌素A是一种植物毒素,而具有抗癌、抗菌作用的蛇孢菌素I的产量较高,具有工业化生产的潜力。
Reproduction of a hyperkalemia animal model
Jian HUO,Xing-li SU,Shuang WANG
Medical Journal of Chinese People's Liberation Army , 2011,
Abstract: Objective To reproduce an animal model of myocardium hyperkalemia and to relieve its symptoms with calcium chloride(CaCl2) with the purpose of observing the effect of hyperkalemia on electrocardiogram Ⅱ(ECGⅡ).Methods Fifty toads(either gender) were assigned into two groups,i.e.experiment group and control group.Animals in experiment group were injected with 0.3ml of 0.2% potassium chloride(KCl) via abdominal vein to reproduce hyperkalemia model,while those in control group were injected same amount of 0.9% sodium chloride(NaCl),then ECG Ⅱ was synchronously recorded.Two minutes later,animals in experiment group were injected with 0.2ml of 1% calcium chloride(CaCl2) via the abdominal vein to relieve hyperkalemia,and ECGⅡ was again synchronously recorded.Results After injection of 0.2% KCl,ECG Ⅱ of the animals in experiment group showed that the heart rate was slowed down(P < 0.05),P-R interval was extended(P < 0.05),QRS was broadened and lowered(P < 0.05),T peak became higher(P < 0.05) as compared with that in control group.Two minutes after injection of 1% CaCl2,the ECG Ⅱ of the animals in experiment group recovered to normal status,and no significant difference was found between that of experiment group and control group.Conclusion The changes in ECG Ⅱ in toad model of myocardium hyperkalemia,produced by injection of 0.2% KCl,and then relieve the symptoms by injection of 1% CaCl2 via abdominal vein,is similar to that in mammals.Compared with other animal models,the hyperkalemia toad model is more convenient to be established with practical and stable result,and the cost is lower.
Eyebrow Recognition Based on Hidden Markov Models
基于离散HMM的眉毛识别方法研究

LI Yu-jian,LI Xing-li,
李玉鑑
,李星立

中国图象图形学报 , 2008,
Abstract: 为说明人类的眉毛作为一种生物特征使用的可能性和可行性,提出了一种基于离散HMM的眉毛识别方法,并对它的识别率随观察符号个数和模型状态数的变化关系进行了初步的实验研究。实验结果表明,该方法在一个27人的小规模眉毛数据库上最高识别率可以达到92.6%。
Subconscious Effect on Pedestrian Counter Flow

KUANG Hua,SONG Tao,LI Xing-Li,DAI Shi-Qiang,

中国物理快报 , 2008,
Abstract: We propose an extended lattice gas model with different maximum velocities to simulate pedestrian counter flow by considering the subconscious behaviour of walkers. Four types of walkers including faster right walkers, slower right walkers, faster left walkers and slower left walkers are involved in the simulation. The simulation results show that our model can capture some essential features of pedestrian counter flows, such as the lane formation, segregation effect and phase separation at higher densities. We also find that the subconscious effect can reduce the occurrence of jam cluster evidently compared with the case of un-subconscious effect. At large maximum velocity, the critical density corresponding to the maximum flow rate of the fundamental diagram is in good agreement with the empirical results.
Phase transition on speed limit traffic with slope

Li Xing-Li,Song Tao,Kuang Hua,Dai Shi-Qiang,

中国物理 B , 2008,
Abstract: Through introducing a generalized optimal speed function to consider spatial position, slope grade and variable safe headway, the effect of slope in a single-lane highway on the traffic flow is investigated with the extended optimal speed model. The theoretical analysis and simulation results show that the flux of the whole road with the upgrade (or downgrade) increases linearly with density, saturates at a critical density, then maintains this saturated value in a certain density range and finally decreases with density. The value of saturated flux is equal to the maximum flux of the upgrade (or downgrade) without considering the slight influence of the driver's sensitivity. And the fundamental diagrams also depend on sensitivity, slope grade and slope length. The spatiotemporal pattern gives the segregation of different traffic phases caused by the rarefaction wave and the shock wave under a certain initial vehicle number. A comparison between the upgrade and the downgrade indicates that the value of saturated flux of the downgrade is larger than that of the upgrade under the same condition. This result is in accordance with the real traffic.
Adaptive digital watermarking algorithm based on energy analysis of wavelet coefficients block
基于小波系数块能量分析的自适应数字水印算法

ZHU Xing-li,ZHANG Jia-shu,
朱兴力
,张家树

计算机应用 , 2006,
Abstract: To enhance the robustness of watermark, an improved digital watermarking algorithm based on wavelet transform was proposed. The third level detail sub-images decomposed the original image using three levels DWT(Discrete Wavelet Transform) were divided into non-overlap blocks. Then the blocks, which were more adaptable to embed watermark, were selected by block energy analysis. At the end, combining with the properties of human visual system, the watermark was adaptively embedded into the largest coefficients which belonged to the selected blocks. Theoretical analysis and experiment results show that the watermark generated with the proposed algorithm is imperceptible and more robust.
Models and Algorithms for Alignment of Biological Networks
生物网络比对的模型与算法

GUO Xing-Li,GAO Lin,CHEN Xin,
郭杏莉
,高琳,陈新

软件学报 , 2010,
Abstract: 生物网络比对是生物体结构、功能和进化分析的重要研究手段.首先给出了生物网络比对问题的形式化定义;其次重点分析了现有的比对模型和算法,按照比对方法的数学特性对其进行了分类,并对典型算法结合应用进行了深入探讨,对3类比对方法的特点进行了总结与比较;再次,分析归纳了生物网络比对软件,阐述了生物网络比对研究的意义和应用;最后指出了生物网络比对研究中的关键问题及生物网络比对未来的研究方向.
New insights into traffic dynamics: a weighted probabilistic cellular automaton model

Li Xing-Li,Kuang Hu,Song Tao,Dai Shi-Qiang,Li Zhi-Peng,

中国物理 B , 2008,
Abstract: From the macroscopic viewpoint for describing the acceleration behaviour of drivers, a weighted probabilistic cellular automaton model (the WP model, for short) is proposed by introducing a kind of random acceleration probabilistic distribution function. The fundamental diagrams, the spatiotemporal patterns, are analysed in detail. It is shown that the presented model leads to the results consistent with the empirical data rather well, nonlinear flow--density relationship existing in lower density regions, and a new kind of traffic phenomenon called neo-synchronized flow. Furthermore, we give the criterion for distinguishing the high-speed and low-speed neo-synchronized flows and clarify the mechanism of this kind of traffic phenomenon. In addition, the result that the time evolution of distribution of headways is displayed as a normal distribution further validates the reasonability of the neo-synchronized flow. These findings suggest that the diversity and the randomicity of drivers and vehicles have indeed a remarkable effect on traffic dynamics.
Nitrogen released from different plant residues of the Loess Plateau and their additions on contents of microbial biomass carbon, nitrogen in soil

Jian-Bin Zhou,Xing-Li Chen,Ying-Li Zhang,Jian-Liang Liu,

生态学报 , 2010,
Abstract:
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