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Power distribution algorithm based on game theory in the femtocell system

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The Journal of China Universities of Posts and Telecommunications 2013年第2期20卷 42-47页

作者： MU shi-yao ZHU Qi Jiangsu Key Lab of Wireless Communications Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Educations Nanjing University of Posts and Telecommunications

This paper studies the power control problem in femtocell system based on Nash non-cooperative game theory. It designs an utility function taking fem stations＇ transmit power as variable and relates it to the requirements of macro users＇ and fem users＇ signal to interference plus noise ratio （SINR）. The utility also takes the impact of fem stations＇ location into account and improves the fairness of non-cooperative game. On this basis, this paper proposes a distributed power control algorithm and proves the existence and uniqueness of Pareto optimal point. The simulation results show that the algorithm improves the convergence speed and system performance through improving users＇ SINR.

关键词： Nash non-cooperative game power control utility function

Numerical Simulation of Residual Stress during Microlayer Composite Material Processing by EBPVD Technique

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Journal of Materials Science & Technology 2003年第z1期19卷 80-82页

作者： Liping shi yao LI Xiaodong HE Centerfor Composite Materials Harbin Institute of Technology Harbin 150001 China Centerfor Composite Materials Harbin Institute of Technology Harbin 150001 China Centerfor Composite Materials Harbin Institute of Technology Harbin 150001 China

The preparation technology of microlayer composite material by the electron beam physical vapor deposition (EBPVD) technique was briefly introduced. Taking the advantage of the large-scale commercial softvare of finite element analysis, areasonable physical model was built up during the deposition processing and the distribution of residual stress was analyzedbetween substrate and deposition layer or among deposition layers. The results show that: with the increasing substrate preheating temperature, the interlaminar shear stress increases but the axial residual stress decreases. The probability of curlingup after de-bonding tends to enhance as the thickness of deposition film increases.

关键词： Microlayer composite material, EBPVD, Residual stress, Numerical simulation

Study on a probabilistic algorithm for the forming and 3D characterization of special-shaped surfaces under profile grinding

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Advances in Manufacturing 2024年第2期12卷 288-299页

作者： Zhao-Qing Zhang Kai-Ning shi yao-yao shi Yi-Hui Song Zhe He Ya-Song Pu School of Mechanical Engineering Northwestern Polytechnical UniversityXi’an710072People’s Republic of China Key Laboratory of High Performance Manufacturing for Aero Engine(Northwestern Polytechnical University) Ministry of Industry and Information TechnologyXi’an710072People’s Republic of China Engineering Research Center of Advanced Manufacturing Technology for Aero Engine(Northwestern Polytechnical University) Ministry of EducationXi’an710072People’s Republic of China

Profile grinding is the most crucial method for the ultra-precision machining of special-shaped ***,profile grinding produces a unique machining profile,and many random factors in the machining process lead to complex surface *** this study,the structural and probabilistic characteristics of the profile grinding of a special-shaped surface were analyzed,and a probabilistic algorithm for the forming and 3D characterization of special-shaped surfaces under profile grinding was *** forming process of a GH738 blade tenon tooth surface was considered as an example to demonstrate the *** comparison results showed that the simulation results had similar surface characteristics to the measurement results,and the relative error range of the 3D roughness parameter was 0.21%–19.76%,indicating an accurate prediction and characterization of the complex special-shaped surface under the action of multiple factors.

关键词： Special-shaped surface Profile grinding Surface morphology 3D characterization

A New Boundary of the Mapping Class Group

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Acta Mathematica Sinica,English Series 2023年第5期39卷 885-903页

作者： Li Xin LIU yao Zhong shi School of Mathematics Sun Yat-sen UniversityGuangzhou 510275P.R.China

Based on the action of the mapping class group on the space of measured foliations,we construct a new boundary of the mapping class group and study the structure of this *** an application,for any point in Teichmüller space,we consider the orbit of this point under the action of the mapping class group and describe the closure of this orbit in the Thurston compactification and the Gardiner-Masur compactification of Teichmüller *** also construct some new points in the Gardiner-Masur boundary of Teichmüller space.

关键词： Mapping class group measured foliation Teichmiller space

Electronic and Shallow Impurity States in Semiconductor Heterostructures Under an Applied Electric Field

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Communications in Theoretical Physics 2005年第2X期44卷 375-380页

作者： ZHOU Hai-Yang GU shi-Wei shi yao-Ming Department of Physics Shanghai University Shanghai 200436 China Department of Applied Physics Shanghai Jiao Tong University Shanghai 200030 China

With the use of variational method to solve the effective mass equation, we have studied the electronic and shallow impurity states in semiconductor heterostructures under an applied electric field. The electron energy levels are calculated exactly and the impurity binding energies are calculated with the variational approach. It is found that the behaviors of electronic and shallow impurity states in heterostructures under an applied electric field are analogous to that of quantum wells. Our results show that with the increasing strength of electric field, the electron confinement energies increase, and the impurity binding energy increases also when the impurity is on the surface, while the impurity binding energy increases at first, to a peak value, then decreases to a value which is related to the impurity position when the impurity is away from the surface. In the absence of electric field, the result tends to the Levine's ground state energy (-1/4 effective Rydberg) when the impurity is on the surface, and the ground impurity binding energy tends to that in the bulk when the impurity is far away from the surface. The dependence of the impurity binding energy on the impurity position for different electric field is also discussed.

关键词： heterostructures electric field impurity states

Experimental quantum Hamiltonian identification from measurement time traces

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Science Bulletin 2017年第12期62卷 863-868页

作者： shi-yao Hou Hang Li Gui-Lu Long Microsystem&Terahertz Research Center and Institute of Electronic Engineering China Academy of Engineering PhysicsMianyang 621999China State Key Laboratory of Low-dimensional Quantum Physics and Department of Physics Tsinghua UniversityBeijing 100084China The Innovative Center of Quantum Matter Beijing 100084China Tsinghua National Laboratory of Information Science and Technology Beijing 100084China

Identifying Hamiltonian of a quantum system is of vital importance for quantum information *** this article, we realized and benchmarked a quantum Hamiltonian identification algorithm recently proposed(Zhang and Sarovar, 2014). we realized the algorithm on a liquid nuclear magnetic resonance quantum information processor using two types of working media with different forms of Hamiltonian. Our experiment realized the quantum identification algorithm based on free induction decay signals. We also showed how to process data obtained in a practical experiment. We studied the influence of decoherence by numerical simulations. Our experiments and simulations demonstrate that the algorithm is effective and robust.

关键词： Quantum informationHamiltonian identificationMeasurement time tracesExperimental realizationNuclear magnetic resonance

External sclerostomy with the femtosecond laser versus a surgical knife in rabbits

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International Journal of Ophthalmology(English edition) 2012年第3期5卷 258-265页

作者： yao shi, Fa-Gang Jiang Department of Pediatrics Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 Hubei Province China Department of Ophthalmology Union Hospital Tongji Medical College Huazhong University of Science and Technology Wuhan 430022 Hubei Province China Wuhan National Laboratory for Optoelectronics Huazhong University of Science and Technology Wuhan 430074 Hubei Province China

AIM: To experimentally compare the external sclerostomy produced using a femtosecond laser with that made by a surgical knife and to evaluate the healing patterns, efficacy and technical advantages of femtosecond laser sclerostomy. METHODS: In a prospective randomized, controlled, masked-observer study, 10 pigmented rabbits underwent external sclerostomy with a femtosecond laser in the right eye; 10 additional rabbits underwent sclerostomy with a surgical superblade in the right eye. Clinical characteristics, which included bleb morphology and intraocular pressure, were recorded for 1 month after surgery. Six additional rabbits underwent external femtosecond laser sclerostomy in the right eye and mechanical sclerostomy in the left eye and were killed at day 14 after surgery. Histologic staining, immunohistochemistry and scanning electron microscopy were subsequently performed to assess the morphology of the filtering fistula. The titanium-sapphire femtosecond laboratory laser was operating at a repetition rate of 1 kHz, 0.4 mJ pulse energy, a central wavelength of 800nm and a pulse duration of 50 femtoseconds. Mann-Whitney and Kaplan-Meier tests were used for statistical analysis. RESULTS: Successful complete sclerostomy was achieved in each laser-treated eye which was hit only once by the laser. The laser treated time was approximately 15s-16s. In the laser-treated group (n =16), 2 eyes (12%) developed mild hyphema at the site of entry and 8 eyes (50%) showed transient edema in the corneal periphery adjacent to the laser impact zone. The differences between the groups in duration of function blebs and pressure reduction were statistically significant (P=0.025 and 0.016, respectively). The success rate of the laser-treated group was significantly higher than the knife group (P=0.005). Histologically, the subconjunctival connective tissue was loosely arranged with partially patent sclerostomy in the laser-treated eyes at postoperative day 14. This contrasted with the

关键词： femtosecond laser sclerostomy fibrosis glaucoma

Spatial-Modulated Physical-Layer Network Coding Based on Block Markov Superposition Transmission for Maritime Relay Communications

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China Communications 2020年第3期17卷 26-35页

作者： yao shi Liming Zheng Wenchao Lin Xiao Ma School of Data and Computer Science Sun Yat-sen UniversityGuangzhou 510006China Guangdong Key Laboratory of Information Security Technology Sun Yat-sen UniversityGuangzhou 510006China

As an alternative to satellite communications,multi-hop relay networks can be deployed for maritime long-distance *** from terrestrial environment,marine radio signals are affected by many factors,e.g.,weather conditions,evaporation ducting,and ship rocking caused by *** ensure the data transmission reliability,the block Markov superposition transmission(BMST)codes,which are easily configurable and have predictable performance,are applied in this ***,the physical-layer network coding(PNC)scheme with spatial modulation(SM)is adopted to improve the spectrum *** the BMST-SMPNC system,we propose an iterative algorithm,which utilizes the channel observations and the a priori information from BMST decoder,to compute the soft information corresponding to the XORed bits constructed by the relay *** results indicate that the proposed scheme outperforms the convolutional coded SM-PNC over fast-fading Rician ***,the performance can be easily improved in high spatial correlation maritime channel by increasing the memory m.

关键词： block Markov superposition transmission maritime relay communications physical-layer network coding Rician fading spatial modulation

OBSERVATION AND ANALYSIS ON CHARACTERISTIC OF NATURAL RIVERS

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Journal of Hydrodynamics 2005年第5期17卷 615-620页

作者： LU Jin-you XU Hai-tao yao shi-ming Yangtze River Scientific Research Institute Wuhan 430010 China

Based on the previous study on turbulent structure, field experiments on fluctuation velocity were carried out in section Huanglingmiao of main stream of Yangtze River with a 3-D Doppler velocimeter. And a number of data such as velocity of different discharge and different vertical line were obtained. According to the field experiment data, period, frequency, period function and probability density function of large-scale coherent structure in natural river were prescribed by means of quantitative analysis. And the problem about distribution of time average velocity, turbulent intensity and Reynolds stress along depth were further analyzed and calculated. The results in this paper will deepen the understand of large-scale turbulent structure in natural river and so make the base for applying“turbulence theory” to water conservancy, hydroelectric, environment engineering and so on.

关键词： natural river large scale turbulence turbulent mechanism