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Effective capacity region of two-user opportunistic spectrum access

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Science china(Information Sciences) 2011年第9期54卷 1928-1937页

作者： XU YuHua,WANG JinLong & WU QiHui Institute of Communications Engineering,PLA University of Science and Technology,Nanjing 210007,china 1. Institute of Communications Engineering PLA University of Science and Technology Nanjing 210007 China

The effective capacity region of the two-user opportunistic spectrum access (OSA) system in Rayleigh fading environment is derived in this *** OSA is a contemporary research topic,little attention has been given to the capacity analysis under quality-of-service (QoS) ***,we use the effective capacity,which is a powerful tool to analyze the QoS requirements in wireless communication systems,to study the sustainable packet arrival rate of the secondary users while meeting statistical QoS *** derive the effective capacity region of the two-user OSA system and propose a method to obtain the capacity region *** addition,by combining the finite state channel model and the activity of the primary user,an extended finite state channel model for the two-user OSA system is also proposed.

关键词： cognitive radio opportunistic spectrum access effective capacity

Genotoxicity　of　substituted　nitrobenzenes　and　the　quantitative　structure－activity　relationship

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Journal of Environmental Sciences 1996年第1期8卷 103-109页

作者： Huang Qingguo Liu Yongbin Wang Liansheng Han Shuokui(Department of Environmental Science and Engineering,Nanjing University,Nanjing 210093,china)Yang Jun(Jiangsu Metallurgy Institute.Nanjing 210007,china)

The genotoxicity of 22 substituted nitrobenzenes were evaluated by the chromosome aberrations test in in vitro human peripheral lymphocytes.18 of 22 compounds exhibit genotoxic *** structure-activity relationship model was established to correlate the genotoxicity of substituted nitrobenzenes with the characteristics of the substituents on benzene ring.

关键词： quantitative structure-activity relationship(QSAR) substituted nitrobenzenes genotoxicity.

A novel multicluster V-MIMO PCR scheme in large-scale Ad Hoc networks

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Science china(Information Sciences) 2010年第10期53卷 2097-2105页

作者： ZHOU Yao, CAI YueMing & PAN ChengKang Department of Wireless Communication, Institute of Communications Engineering, PLA University of Science and Technology, Nanjing 210007, china 1. Department of Wireless Communication Institute of Communications Engineering PLA University of Science and Technology Nanjing 210007 China

A multicluster packet collision resolution (PCR) scheme is a kind of recently proposed virtualMIMO techniques. In existing multicluster PCR schemes, a large-scale wireless Ad Hoc network is divided into clusters and the single cluster PCR scheme is applied independently to resolve collisions in each cluster. However, there are still some flaws in existing multicluster PCR schemes. In this paper, by presenting a concise theoretical analysis model and a new CNS algorithm, a novel multicluster PCR scheme is proposed. Analysis and simulation results show that the proposed scheme can obtain high performance gain with low complexity. The proposed scheme is more robust and applicable than existing schemes.

关键词： packet collision resolution virtual-MIMO cooperative communication cooperative nodes selection

The System Dynamics (SD) is used for researching on battle simulation

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Systems Science and Systems Engineering 2000年第3期10卷 367-372页

作者： WANG Ke\|ding,\ HUANG Zi\|li Nanjing Engineering Institute, Jiangsu, Nanjing 210007, china

The characteristics of applying System Dynamics (SD) to battle simulation are introduced. With Lanchester Model of the troops recruit and non battle depletion, arms of the services coordinated campaign Lanchester Mod... 详细信息

关键词： battle simulation system dynamics(SD) model

A new policy to solve routing conflicts in shuffle-exchange networks

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Science china(Information Sciences) 2011年第7期54卷 1512-1523页

作者： GE FangBin 1,ZHAO Min 1,ZHANG Tao 1 & WANG JianXin 2 1 College of Command Automation PLA University of Science and Technology,Nanjing 210007,china 2 Institute of china Electronic System Engineering,Beijing 100039,china 1. College of Command Automation PLA University of Science and Technology Nanjing 210007 China2. Institute of China Electronic System Engineering Beijing 100039 China

Batch routing is an important approach for solving routing conflicts in SE (shuffle-exchange) ***,the complexity of batching and the uncertainty of batch size makes this approach *** on sequence division and routing coding concepts,we propose a method for detecting routing conflicts in an SE network,known as dividing detection that is more efficient than the method for window *** addition,a new conjecture relating to routing policies in SE networks is *** is proved using a constructive approach when n < *** on the conjecture,a new routing scheme for SE networks is *** this scheme,all the input signals can be transfered without conflicts and within two batches,while the efficiency of the batch routing is noticeably improved.

关键词： shuffle-exchange network sequence division routing coding transition sequence educed sequence

NEW ACHIEVEMENTS ON THE THEORY AND TECHNOLOGY OF EXPLOSIVE WELDING

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Acta Metallurgica Sinica(English Letters) 2003年第6期16卷 531-537页

作者： C.G. Shi, Y.H. Wang, L.G. Cai and C.H. ZhouEngineering Institute of Engineering Corps, PLA University of Science and Technology, Nanjing 210007, china Engineering Institute of Engineering Corps PLA University of Science and Technology

There are four new achievements of this work on the theory and technology of explosive welding.(1) It has been found and defined three kinds of bonding interfaces: big wavy, small wavy and micro wavy, and the micro wavy interface is the best. In a cladding plate, it is for the first time to find that the form of interface presents regular distribution.(2) Although the interface has the features of melt, diffusion and pressure welding in the mean time, the seam and 'hole' brought by the melt weaken the bonding strength of interface greatly, and the effect of melt on interface must be eliminated in explosive welding, so explosive welding is not a melt weld. The diffusion welding is a kind of form of pressure welding, and the diffusion is not the reason of the bonding of interface but the result of interface high pressure. So the diffusion welding cannot also explain the bonding mechanism of it. The experiment and theory make clear that explosive welding is a special pressure one.(3) To get good interface of no melt, explosive charge must be selected on the low limit of welding windows. In explosive welding, the drive plate should be treated as the viscous and plastoelastic body, not incompressible fluid. The bending moment under the explosive welding loading must be greater than that under dynamic limit of drive plate. According to the condition, the lower limit of explosive welding is obtained. It is about 20% less than that obtained by tradition calculation, and suitable for engineering application.(4) It is for the first time to test and study on soil anvil characteristics and change regularity under explosive welding impact loading. Through soil anvil parameter optimization analysis, it is the best for explosive welding with sandy soil of water content 17.00% and density 1.74q/cm3.

关键词： explosive welding bonding interface pressure welding low limit

Optimal MAC based cooperative spectrum sensing in cognitive radio networks

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Science china(Information Sciences) 2012年第6期55卷 1388-1396页

作者： CHEN Zhong 1,ZHANG XianDa 1 & YANG LanJuan 2 1 State Key Laboratory of Intelligent Technology and Systems,Tsinghua National Laboratory for Information Science and Technology,Department of Automation,Tsinghua University,Beijing 100084,china 2 Institute of Command Automation,PLA University of Science and Technology,Nanjing 210007,china 1. State Key Laboratory of Intelligent Technology and Systems Tsinghua National Laboratory for Information Science and Technology Department of Automation Tsinghua University Beijing 100084 China2. Institute of Command Automation PLA University of Science and Technology Nanjing 210007 China

This paper considers a cognitive radio (CR) system in non-ideal fading wireless channels and pro-poses cooperative spectrum sensing schemes based on coherent multiple access channels (MAC),serving as an alternative way to improve the cooperative spectrum sensing performance and provide space diversity for spec-trum *** statistics are transmitted using a common channel from the secondary users (SUs) to a fusion center (FC) where the global decision is *** optimal scaling factors of the proposed schemes are obtained by maximizing the detection probability under a target false alarm probability and a transmit power *** the proposed optimal MAC scheme has high computational complexity,a sub-optimal solu-tion based on maximization of the deflection coefficient (DC) is also *** results show that the proposed algorithms can significantly improve the spectrum sensing performance and approach the detection baseline.

关键词： cognitive radio (CR) spectrum sensing multiple access channel (MAC) deflection coefficient optimization

Model tests on anomalous low friction and pendulum-type wave phenomena

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Progress in Natural Science:Materials International 2009年第12期19卷 1805-1820页

作者： Hao Wu~*,Qin Fang,Yusheng Lu,Yadong Zhang,Jinchun Liu Engineering Institute of Engineering Corps,PLA University of Science and Technology,Nanjing,Jiangsu 210007.china [a]Engineering Institute of Engineering Corps PLA University of Science and Technology Nanjing Jiangsu 210007 China

The anomalous low friction(ALF) and pendulum-type wave(μwave) phenomena were two typical,nonlinear,geo-mechanical,and dynamic responses in deep-block rock mass discovered from in situ observations,which occurred from the movement of the geo-blocks under the impact of external pulses,such as deep confined explosion,earthquake,and rock *** the aim to confirm the existence of the above two phenomena and study the variation laws of them experimentally,laboratory tests on the granite and cement mortar continuum and blocks models were conducted on the self-independently developed multipurpose testing system,*** ALF phenomenon was realized under two loading schemes,the blocks model and working block were acted upon by the joint action of vertical impact and horizontal static force as well as the joint action of both vertical and horizontal impacts with different time *** revealed that the discrete time delays corresponding to the local maximums and minimums of the horizontal displacement amplitudes and residual horizontal displacements of the working block satisfied the canonical sequences with the multiple of 21/2,most of which satisfied the quantitative expression(21/2)~i△/***,the one-dimensional impact experiments were carried out on the blocks granite model,continuum, and blocks cement mortar models,*** on the comparison and analysis of the propagation properties(amplitudes and the Fourier spectrums of acceleration time histories of blocks) of the 1D stress wave in the above models,it is indicated that the fractures in rock mass have tremendous effect on the attenuation of acceleration amplitudes and high-frequency *** comparison of the model test data with the in situ measurement conclusions,the existence of theμwave was confirmed experimentally in the cement mortar blocks model with larger dimensions,and the frequencies corresponding to the local maximums of spectral density curves of three-directional accelera

关键词： Deep-block rock mass Block-hierarchical structure Anomalous low friction Pendulum-type wave Canonical sequence

NEUMANN SERIES SOLUTION TO A NEUTRON TRANSPORT EQUATION OF SLAB GEOMETRY

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Systems Science and Mathematical Sciences 1993年第1期6卷 13-17页

作者： WANG Zaihua YANG Mingzhu QIN Guoqiang Institute of Atomic Energy,Beijing 102413,china College of Engineer Corps, Nanjing 210007, china 北京原子能所北京南京陆军工程学院江苏南京

This paper deals with the solution to an energy, dependent stationary neutrontransport equation of slab geometry. In L^p space, the equation is converted into an equiva-lent integral equation. By the study of the corresponding integral operator and its spectralradius, results of Neumann series solution are obtained, and an easy-verified condition thatthe transport equation has a nonnegative solution is given.

关键词： Neutron transport equation series solution spectral radius