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Search Results: 1 - 10 of 39954 matches for " MA Yao "
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A Novel Scheme for Deleting Group Members  [PDF]
Junping Yao, Xinshe Li, Junchun Ma
Journal of Computer and Communications (JCC) , 2014, DOI: 10.4236/jcc.2014.24006

Deleting group members safely and efficiently has been a hot research issue in the field of the group signature. Some resolutions have been proposed by cryptography experts, but in some way, problems like loophole and low efficiency have been confusing us in the research. To solve the problem, the writers try to give a new secret key updating algorithm based on improving Wang Shangping’s group members deleting scheme, and analyze the safety and efficiency of implemen- tation systematically in the paper.

Research on the Correlation between Learning Effectiveness and Online Learning Behavior Based on Online Education Scene  [PDF]
Haiying Ma, Jun Yao, Lewen Liu
Creative Education (CE) , 2017, DOI: 10.4236/ce.2017.813149
Abstract: With the development of electronic equipment and communication technology, online learning came into being. However, online learning makes?the time and space divided in the teaching process, so that the teachers can not accurately control the learners?learning state and evaluate the learners?learning situation. In this paper, statistical analysis method is used to analyze the online learning behavior and achievements of three courses of a university network education institute, and the index correlation between the learning effect and the learning behavior in the process of online education is studied. It also reflects the problem that the online learning does not give full play to its advantages and the process of online learning is neglected by the learners.
On the cohomology and extensions of first-class $n$-Lie superalgebras
Yao Ma,Liangyun Chen
Mathematics , 2013,
Abstract: An $n$-Lie superalgebra of parity 0 is called a first-class $n$-Lie superalgebra. In this paper, we give the representation and cohomology for a first-class $n$-Lie superalgebra and obtain a relation between extensions of a first-class $n$-Lie superalgebra $\mathfrak{b}$ by an abelian one $\mathfrak{a}$ and $Z^1(\mathfrak{b}, \mathfrak{a})_{\bar{0}}$. We also introduce the notion of $T^*$-extensions of first-class $n$-Lie superalgebras and prove that every finite-dimensional nilpotent metric first-class $n$-Lie superalgebra $(\g,< ,>_{\g})$ over an algebraically closed field of characteristic not 2 is isometric to a suitable $T^*$-extension.
Some structure theories of Leibniz triple systems
Yao Ma,Liangyun Chen
Mathematics , 2014,
Abstract: In this paper, we investigate the Leibniz triple system $T$ and its universal Leibniz envelope $U(T)$. The involutive automorphism of $U(T)$ determining $T$ is introduced, which gives a characterization of the $\Z_2$-grading of $U(T)$. We give the relationship between the solvable radical $R(T)$ of $T$ and $Rad(U(T))$, the solvable radical of $U(T)$. Further, Levi's theorem for Leibniz triple systems is obtained. Moreover, the relationship between the nilpotent radical of $T$ and that of $U(T)$ is studied. Finally, we introduce the notion of representations of a Leibniz triple system.
On Quadratic g-Evaluations/Expectations and Related Analysis
Jin Ma,Song Yao
Mathematics , 2009,
Abstract: In this paper we extend the notion of g-evaluation, in particular g-expectation, to the case where the generator g is allowed to have a quadratic growth. We show that some important properties of the g-expectations, including a representation theorem between the generator and the corresponding g-expectation, and consequently the reverse comparison theorem of quadratic BSDEs as well as the Jensen inequality, remain true in the quadratic case. Our main results also include a Doob-Meyer type decomposition, the optional sampling theorem, and the up-crossing inequality. The results of this paper are important in the further development of the general quadratic nonlinear expectations.
Studies on the optimal culture conditions of Aureobasidium pullulans to produce exopolysaccharides  [PDF]
Jinlong Ma, Guobin Jiang, Shanjing Yao, Hua Jin, Changhai Wang
Journal of Biomedical Science and Engineering (JBiSE) , 2012, DOI: 10.4236/jbise.2012.54027
Abstract: In the current study, in order to change the permeability of cell membrane and solve the problem of linked group of fungi mycelium, the method of adjusting osmotic pressure of medium and adding tween-80 was established. The utilized strain with relatively high exopolysaccharide (EPS) yield and low pigment level was obtained after the rejuvenation and sifting of long-preserved Aureobasidium pullulans strain. The optimal proportion of substrate was determined by means of orthogonal test. The transformation ratio of EPS was increased by 10% - 20% and the pigment content was greatly reduced. The fermenting liquor is between creamy white and pale yellow, and the white primary product can be gained without decolourization step. Furthermore, to magnify to 5 L bioreactor can get the similar result.
Test Method of Laser Detection Sensitivity Based on Every Pulse Measurement and Rearrangement  [PDF]
Hao Guo, Na Ma, Hongpeng Zhao, Mei Yao
Optics and Photonics Journal (OPJ) , 2017, DOI: 10.4236/opj.2017.78B006
It is very important to accurately measure the detection sensitivity of laser receiving equipment. Based on the traditional test method of detection probability curve, a new test method is proposed which works through measuring laser pulse one by one. Accurate measurement systems were constructed to improve the accuracy of laser energy measurement and energy regulation. A new data processing method of detection probability curve is put forward, which based on subsection statistics. The new data processing method in effect reduces the light source instability from 6.57% to 0.67%. These works improve the test accuracy of laser receiving detection sensitivity. It is a great support for the accurate evaluation of key technical indices of laser receiving equipment, which subsequently are done by models and simulation.
Description and Regulation of Drilling Completion Fluid Cake Structure  [PDF]
Xue Liu, Dong Ma, Pengfei Mu, Zhanhua Zhang, Junbo Yao
Open Journal of Yangtze Oil and Gas (OJOGas) , 2018, DOI: 10.4236/ojogas.2018.34025
Abstract: In the process of oil and gas well drilling and completion, under the action of positive pressure gradient or self-absorption, drilling and completion fluid solid phase particles block the reservoir pore and form the filter cake. The filter cake plays a vital role in reservoir protection, and is closely related to the oil and gas well productivity from cake formation to remove. The filter cake is always expected to be thin, tough, with low permeability and easy to remove. Many scholars made a lot of research from the filter cake layer structure, space truss structure, pore structure and the structure of fractal structure of filter cake. However, the researches on the structure of the filter cake are mainly conducted qualitatively at home and abroad, while the quantitative research progress is slow. At the same time, the research on the relationship between the filter cake structure and its performance is also relatively weak. In recent years, with the wide application of horizontal wells, it has called widespread attention on how to effectively remove filter cake in order to improve the oil and gas well production capacity at home and abroad. The widely-used filter cake removal technology mainly includes natural clear, mechanical removal, chemical removal and biological removal technology currently. Among them, the biological removal technology is developed in recent years as a new type of filter cake removal technology. With the further development of mud cake removal technology and downhole filter cake removing circumstance with increasing complexity, a single filter cake removal technology cannot completely meet the requirements. The filter cake removal technology is developing in the direction of the composite to clear, in order to obtain ideal filter cake removal effect.
A Matlab/Simulink Development and Verification Platform for a Frequency Estimation System  [PDF]
Yingtai Li, Lisheng Yang, Xin Lei, Rui Ma, Luncai Liu, Fan Liu, Yao Yao
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.611010
The precise estimation of the frequency of the signal is of great significance in the Radar system, the electronic warfare system and many other systems. In this paper, we propose a development and verification platform for the frequency estimation system in the Matlab and Simulink environment. Its open-extensibility architecture enables the performance evaluation of different frequency estimation algorithms and its graphic interface can greatly promote the system design, simulation and verification efficiency.
Biocompatibility of Porous Spherical Calcium Carbonate Microparticles on Hela Cells  [PDF]
Yaran Zhang, Ping Ma, Yao Wang, Juan Du, Qi Zhou, Zhihong Zhu, Xu Yang, Junlin Yuan
World Journal of Nano Science and Engineering (WJNSE) , 2012, DOI: 10.4236/wjnse.2012.21005
Abstract: Recently there has been a wide concern on inorganic nanoparticles as drug delivery carriers. CaCO3 particles have shown promising potential for the development of carriers for drugs, but little research had been performed regarding their safe dosage for maximizing the therapeutic activity without harming biosystems. In this study, we assessed the biological safety of porous spherical CaCO3 microparticles on Hela cells. The reactive oxygen species (ROS), glutathione (GSH), carbonyl content in proteins (CCP), DNA-protein crosslinks (DPC) and cell viability were measured. Results showed that with the exposure concentration increase, ROS and CCP in Hela cells presented a significant increase but GSH contents in Hela cells and cell viability showed a significant decrease respectively compared with the control. DPC coefficient ascended, but no statistically significant changes were observed. The results indicated that porous spherical CaCO3 microparticles may induce oxidative damage to Hela cells. But compared with other nanomaterials, porous spherical CaCO3 appeared to have good biocompatibility. The results implied that porous spherical calcium carbonate microparticles could be applied as relatively safe drug vehicles, but with the caveat that the effect of high dosages should not be ignored when attempting to maximize therapeutic activity by increasing the concentration.
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