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Search Results: 1 - 10 of 20619 matches for " Qi Liao "
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A Caching Scheme for Session Setup in IMS Network  [PDF]
Yufei CAO, Jianxin LIAO, QI QI, Xiaomin ZHU
Wireless Sensor Network (WSN) , 2009, DOI: 10.4236/wsn.2009.13019
Abstract: In IP Multimedia Subsystem (IMS), the session setup delay is a critical value for Quality of Service (QoS). The existing approaches to improve this metric depend on optimization of Session Initiation Protocol (SIP) message transmitting and signaling flows. Unfortunately, some service features are missing considered al-though they have been used widely in traditional 2G networks. This paper proposes a novel session setup scheme based on caching, upon the investigation of the performance of IMS session establishment. This mechanism involves cache based local routing policy and an adaptive caching algorithm, which can decrease call setup delay effectively as cached information in the terminating Serving-Call Session Control Function (S-CSCF) hit. The analytical model is deduced, as well as the delay and cost ratio functions are presented based on the model. Moreover, the analytical model is validated through the performance simulation in which the performance of the proposed novel method is evaluated against the basic session setup mechanism in terms of cost and delay.
Random walk terminally attached to wall on different lattices
Dacheng Wu,Qi Liao
Chinese Science Bulletin , 1997, DOI: 10.1007/BF02884240
Analysis and Comparison of ARCH Effects for Shanghai Composite Index and NYSE Composite Index
Xinghao Liao,Guangdong Qi
International Journal of Business and Management , 2009, DOI: 10.5539/ijbm.v3n12p20
Abstract: In this article, we used ARCH class model to analyze and compare the income fluctuations of Shanghai Stock Market and NYSE, and obtained the characters of fluctuation for two markets and the models which fitted to describe them. At the same time, we also analyzed the fluctuation overflow effect of two markets, validated the character that Chinese stock market was not relatively mature and possessed low international market integration degree, and put forward relative policy advances.
Random walk terminally attached to wall on different lattices

Dacheng Wu,Qi Liao,

科学通报(英文版) , 1997,
Influence of Soil Salinity on Growth and Physiological Indexes of Phoenix canariensis Seedlings

LIAO Qi-liao,

热带亚热带植物学报 , 2012,
Abstract: The growth and physiology characteristics of Phoenix canariensis seedlings were studied cultured on different soil salinity ranged from 1.2 to 14.5.The results showed that the number of new leaves decreased and death leaves increased with soil salinity increment.The chlorophyll content increased under high soil salinity,while chlorophyll a/b increased under low salinity and declined under high salinity more than 5.1.MDA content maintained about 4.30 μmol g-1 under salinity from 1.2 to 5.1,then increased with soil salinity.The SOD activity increased under low salinity,while decreased rapidly when salinity higher than 10.8.Under salt stress,Na+ and Cl-contents in leaves increased,while K+,Ca2+ and Mg2+ contents and ratio of K+/Na+ declined.The main reasons of growth decline under salt stress were effective photosynthetic area decrease and destroy of ions balance.These indicated that Phoenix canariensis displayed high resistance to salt stress was suitable to plant widely in coastal districts,which could grow normally under soil salinity lower than 5.1 and only shown damage symptoms above salinity of 10.8.
Complex Dynamic Behaviors in Cellular Automata Rule 14
Qi Han,Xiaofeng Liao,Chuandong Li
Discrete Dynamics in Nature and Society , 2012, DOI: 10.1155/2012/258309
Abstract: Wolfram divided the 256 elementary cellular automata rules informally into four classes using dynamical concepts like periodicity, stability, and chaos. Rule 14, which is Bernoulli -shift rule and is a member of Wolfram’s class II, is said to be simple as periodic before. Therefore, it is worthwhile studying dynamical behaviors of rule 14, whether it possesses chaotic attractors or not. In this paper, the complex dynamical behaviors of rule 14 of one-dimensional cellular automata are investigated from the viewpoint of symbolic dynamics. We find that rule 14 is chaotic in the sense of both Li-Yorke and Devaney on its attractor. Then, we prove that there exist fixed points in rule 14. Finally, we use diagrams to explain the attractor of rule 14, where characteristic function is used to describe that all points fall into Bernoulli-shift map after two iterations under rule 14.
Challenge of new biological energy resources
Qi Zhang,Daizheng Liao,Genglin Wang
Chinese Science Bulletin , 1998, DOI: 10.1007/BF02883965
Abstract: Hydrogenases are enzymes that can reversibly split molecular hydrogen. Study on the structure of the active site and the mechanism of catalysis has drawn great attention because the results may be useful for the design of cheap biomimetic hydrogen catalysts for fuel cells, or as model for the photoproduction of H2. At one time the active site was generally considered to be composed of mononuclear nickel complex with ligands from the polypeptide. A breakthrough in the understanding of the structure of [NiFe] Hases occurred with the resolution crystal structure ofD. gigas [NiFe] Hases in 1995. The unexpected result challenged the previously reported spectroscopic studies and caused some academic arguments. Some methods and results used for insight into [NiFe] Hases have to be reconsidered. Different viewpoints concerning the structure of active site of [NiFe] Hases in different periods and some remaining questions will be presented.
Measurement-Adaptive Cellular Random Access Protocols
Anastasios Giovanidis,Qi Liao,Slawomir Stanczak
Computer Science , 2011, DOI: 10.1007/s11276-014-0689-y
Abstract: This work considers a single-cell random access channel (RACH) in cellular wireless networks. Communications over RACH take place when users try to connect to a base station during a handover or when establishing a new connection. Within the framework of Self-Organizing Networks (SONs), the system should self- adapt to dynamically changing environments (channel fading, mobility, etc.) without human intervention. For the performance improvement of the RACH procedure, we aim here at maximizing throughput or alternatively minimizing the user dropping rate. In the context of SON, we propose protocols which exploit information from measurements and user reports in order to estimate current values of the system unknowns and broadcast global action-related values to all users. The protocols suggest an optimal pair of user actions (transmission power and back-off probability) found by minimizing the drift of a certain function. Numerical results illustrate considerable benefits of the dropping rate, at a very low or even zero cost in power expenditure and delay, as well as the fast adaptability of the protocols to environment changes. Although the proposed protocol is designed to minimize primarily the amount of discarded users per cell, our framework allows for other variations (power or delay minimization) as well.
Biological effects of EV71 infection in neural cells  [PDF]
Xia Cao, Li-Chun Wang, Long-Ding Liu, Yun Liao, Cheng-Hong Dong, Qi-Han Li
Journal of Biophysical Chemistry (JBPC) , 2010, DOI: 10.4236/jbpc.2010.12014
Abstract: Enterovirus 71 (EV71) can cause serious nervous system lesions but to date the pathogenesis has been unclear. Our results show that EV71 proliferates in the neural cells and leads to neural cell lesions. The study of the pathology of EV71 infection in neonatal rat brains shows that the invasive ability of EV71 to the nervous system in vivo may depend on many unknown factors.
Meta-analyses of nine polymorphisms of six genes with the risk of schizophrenia  [PDF]
Xuting Xu, Lingyan Wang, Qi Liao, Leiting Xu, Yi Huang, Fuqiang Zhang, Jia Cheng, Meng Ye, Shugui Gao, Shiwei Duan
Advances in Bioscience and Biotechnology (ABB) , 2014, DOI: 10.4236/abb.2014.52012

The aim of this study was to determine whether 9 genetic polymorphisms confered susceptibility to schizophrenia (SCZ). The authors conducted meta-analyses on associations between SCZ and 9 variants of 6 genes including PIK3C3 (432C > T), ABCB1 (C3435T and G2677T), CTLA4 (+49A/G), OLIG2 (rs762178), GAD1 (rs1978340, rs3749034 and rs769395), and GRIN1 (G1001C). A total of 34 case-control studies were involved in our meta-analyses. Our results showed no significant association between all the loci and SCZ. This meta-analysis confirmed a lack of association of SCZ for 9 genetic polymorphisms including GRIN1 G1001C, ABCB1 C3435T and G2677T, CTLA4 + 49A/G, OLIG2 rs762178, GAD1 gene rs1978340, rs3749034 and rs769395, and PIK3C3 432C > T.

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