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Search Results: 1 - 10 of 127810 matches for " Li Xiaofeng "
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Data Collection Strategy in Low Duty Cycle Wireless Sensor Networks with Mobile Sink  [PDF]
Xiaofeng Tang, Li Xie
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2017, DOI: 10.4236/ijcns.2017.105B023
Abstract:
The lifetime of wireless sensor networks can be improved by imposing low duty cycle, but doing so could not solve unbalanced energy consumption and will increase transmission latency. To avoid this, this paper gives a new method to collect data by mobile sink. The proper data collection route is selected according to the sink speed and buffer size of the sensors. The sensors only wake up when the sink approaches them. When certain sensors detect an emergency, the sink catches the message quickly and moves to the hotspot to decrease message relay in the network. The result of simulation by OPNET shows that this protocol can reduce transmission data in the network and prolong the network lifetime.
The Improved Riccati Equation Method and Exact Solutions to mZK Equation
Xiaofeng Li
International Journal of Differential Equations , 2012, DOI: 10.1155/2012/596762
Abstract: We utilize the improved Riccati equation method to construct more general exact solutions to nonlinear equations. And we obtain the travelling wave solutions involving parameters, which are expressed by the hyperbolic functions, the trigonometric functions, and the rational functions. When the parameters are taken as special values, the method provides not only solitary wave solutions but also periodic waves solutions. The method appears to be easier and more convenient by means of a symbolic computation system. Of course, it is also effective to solve other nonlinear evolution equations in mathematical physics.
Effective Mass of Acoustic Polaron in Quantum Dots  [PDF]
Hao Li, Junhua Hou, Xiaofeng Duan
World Journal of Condensed Matter Physics (WJCMP) , 2015, DOI: 10.4236/wjcmp.2015.51005
Abstract: The variational effective mass with respect to the e-p coupling constant for different values of cutoff wave vector is performed in quantum dot. The self-trapping transition of acoustic polaron in quantum dot is reconsidered by character of the effective mass curve varying with the e-p coupling. The holes are determined to be self-trapped in AlN quantum dot systems.
Bayesian Network-Based Service Context Recognition Model
Xiuquan Qiao,Xiaofeng Li
International Journal of Distributed Sensor Networks , 2009, DOI: 10.1080/15501320802571830
Abstract: Service context refers to the environmental information which influences the service execution. The processing of service context information is the foundation of the future intelligent telecommunication services in the ubiquitous convergent network. As the complexity and variability of the real world, there exists a large number of uncertain service context information, such as the imprecise information collected by sensors, data noise, and inaccurate location by different location technologies. Hence, it is crucial to recognize the correct service context environment based on unreliable context information.
Multiple scattering and energy loss in semi-inclusive deeply inelastic eA scattering
Guo, Xiaofeng;Li, Jun
High Energy Physics - Phenomenology , 2007,
Abstract: We calculate the multiple scattering effect on single hadron production in semi-inclusive lepton-nucleus deeply inelastic scattering. We show that the quantum interference of multiple scattering amplitudes leads to suppression in hadron productions. At the leading power in medium length, the suppression can be approximately expressed in terms of a shift in $z$ of the fragmentation function $D(z)$, and could be therefore interpreted as the collisional energy loss. We compare our calculation with existing experimental data. We also discuss the effect of quark mass on the suppression. Our approach can be extended to other observables in hadronic collisions.
Chlorido(2-iminomethyl-3-fluorophenyl-κ2C1,N)tris(trimethylphosphane-κP)iron
Xiaofeng Xu,Xiaoyan Li
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811015030
Abstract: The title compound, [Fe(C7H5FN)Cl(C3H9P)3], was obtained as a product of the reaction of [Fe(Me3P)4] with a molar equivalent of (2-chloro-6-fluorophenyl)methanimine in diethyl ether. This compound is sensitive to air, and rapidly decomposes when exposed to air for a few minutes. The Fe atom has an octahedral coordination geometry in which the bidentate fluorophenyl methanimine ligand forms the equatorial plane with the Cl atom and one of the trimethylphosphane ligands. The other two trimethylphosphane ligands are located in the axial positions. In the crystal, an N—H...Cl hydrogen bond occurs.
The Study of University Students’ Self-Concept
Xiaofeng Zhang,Chengzong Li
International Education Studies , 2010, DOI: 10.5539/ies.v3n1p83
Abstract: Objective: Discussed the development of self-concept of university students. Methods: Used “Tennessee Self Concept Scale (TSCS)”, measured 426 university student’s self-concept status. Results: In the dimension of physical self-ethics, self-criticism, self-satisfaction, there were gender differences in university students’ self-concept. Males’ physical-self, self-criticism and self-satisfied were higher than females’, while females’ ethics were higher than males’. When referred to social self-concept, there were special differences. Students majored liberal arts had a higher score than the students of science. There were also differences in self-criticism, for example, the home location, whether only child or not, and the grades. College students also had differences in grade. Conclusion: College students’ self-concept developed to a relatively stable level in the university. Except for a noticeable difference in gender, only a certain dimensions were noticeable in other demographic variables, while self-criticism had remarkable differences in most of them.
Asymptotic Behavior of a Periodic Diffusion System
Li Songsong,Hui Xiaofeng
Journal of Inequalities and Applications , 2010,
Abstract: We study the asymptotic behavior of the nonnegative solutions of a periodic reaction diffusion system. By obtaining a priori upper bound of the nonnegative periodic solutions of the corresponding periodic diffusion system, we establish the existence of the maximum periodic solution and the asymptotic boundedness of the nonnegative solutions of the initial boundary value problem.
Research on Technological Innovation Evolution Based on Self-organization Theory: the Case of China Communication Industry
Rui Li,Xiaofeng Ju
Journal of Networks , 2010, DOI: 10.4304/jnw.5.7.867-874
Abstract: The technological innovation evolution is a selforganization process. There are complex characteristics in technological innovation system. From the perspective of system theory this paper illuminated the self-organization characteristics of technological innovation system and analyzes the self-organization mechanisms of the innovation process and characteristics of openness, dynamic, nonlinearity, fluctuation and indetermination and constructed the self-organization process model of technological innovation and diffusion then carried on the confirmation with statistical software to the model fitting degree and the model parameters, using the data of China communication market, obtained the quite satisfied result. These models have realized the integration of the natural sciences and the social sciences, and developed a new method for studying on the evolution and diffusion process of the technological innovation and diffusion.
Asymptotic Behavior of a Periodic Diffusion System
Songsong Li,Xiaofeng Hui
Journal of Inequalities and Applications , 2010, DOI: 10.1155/2010/764703
Abstract:
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