A compressed sensing （CS） based channel estimation algorithm is proposed in the fast moving environment. A sparse basis expansion channel model in both time and frequency domain is given.Pilots are placed according ...A compressed sensing （CS） based channel estimation algorithm is proposed in the fast moving environment. A sparse basis expansion channel model in both time and frequency domain is given.Pilots are placed according to a novel random unit pilot matrix （RUPM） to measure the delay- Doppler sparse channel. The sparse channels are recovered by an extension group orthogonal matching pursuit （GOMP） algorithm, enjoying the diversity gain from multi-symbol processing. The relatively nonzero channel coefficients are estimated from a very limited number of pilots at a sampling rate significantly below the Nyquist rate. The simulation results show that the new channel estimator can provide a considerable performance improvement for the fast fading channels. Three significant reductions are achieved in the required number of pilots, memory requirements and computational complexity.展开更多
To obtain higher accurate position estimates, the stochastic model is estimated by using residual of observations, hence, the stochastic model describes the noise and bias in measurements more realistically. By using ...To obtain higher accurate position estimates, the stochastic model is estimated by using residual of observations, hence, the stochastic model describes the noise and bias in measurements more realistically. By using GPS data and broadcast ephemeris, the numerical results indicating the accurate position estimates at sub-meter level are obtainable.展开更多
In the reform of government organizations and institutions of China, we put forward the establishment of personal account system in occupational pension, and the introduction of the ＂account＂ management model of the...In the reform of government organizations and institutions of China, we put forward the establishment of personal account system in occupational pension, and the introduction of the ＂account＂ management model of the non real account accumulation. This paper analyzes the current situation of personal accounts in our country, and puts forward that the account rate of bank deposit can not resist inflation, and can not reflect the real return rate of China＇s pension funds, which is not conducive to the preservation and appreciation of personal account funds. On the basis of the above, the paper puts forward that the account rate should not only consider the level of economic development and inflation, but also to adapt to the financial payment ability, and establish the personal account risk reserve fund system and other improvement measures, and strive to achieve the sustainable development of the personal account system.展开更多
The possible collapse of different circumstances is derived with the help of the limit analysis theory.Analytical equations related to collapsing mechanisms in deep tunnel with smooth three-centered arc cross sections...The possible collapse of different circumstances is derived with the help of the limit analysis theory.Analytical equations related to collapsing mechanisms in deep tunnel with smooth three-centered arc cross sections are derived on the basis of Hoek-Brown failure criterion and upper bound limit analysis.The pore water pressure is considered in the analysis,as a work rate of external force.Numerical results about the shape of detaching curve and the weight of collapsing block per unit length corresponding to different parameters are obtained with the help of mathematical software.The shapes of collapsing block are drawn with respected to different parameters.Furthermore,the effects of different parameters on the shape of detaching curve and the weight of the collapsing block are discussed.展开更多
Suction boxes are used in the paper industry to simultaneously drain a pulp suspension and form a fibre mat （or filter cake）. This research addresses the modelling of fibre deposition in the forming unit of an indus...Suction boxes are used in the paper industry to simultaneously drain a pulp suspension and form a fibre mat （or filter cake）. This research addresses the modelling of fibre deposition in the forming unit of an industrial papermachine, assuming a filtration process, and that of the flowing suspension drained through the building fibre mat and the wire on a suction box. From experimental data of the cumulative drained V volume, per unit surface area, for two vacuum pressures △P and 6 dwell times t, an extension of the classical law （t/V） versus V is proposed, validated and applied. This relation enables determining the average specific filtration resistance of the fibre mat over the box and the mass of solids deposited before and over the suction box. The model obtained is as precise as 1% and can be used to limit and reduce the energy consumption of drainage vacuum assisted devices such as suction boxes in the forming unit of industrial papermachines.展开更多
The merger of the pension not only in relation to the social justice, but also the relationship between the construction of social security system, pensions merger is beyond doubt. Pension dual track the biggest drawb...The merger of the pension not only in relation to the social justice, but also the relationship between the construction of social security system, pensions merger is beyond doubt. Pension dual track the biggest drawback is that a significant loss of fairness, the gap between different groups of pension is too wide, causing social conflicts. The merger of the pension has be imperative. Therefore, it is necessary to establish and perfect the system of the civil service pension insurance legal mandatory occupational pension system, strengthen the basic social pension, broaden the channels for pension investment, reform organs and institutions pension system and pension system Retbrm and civil service pay rise, in order to promote the reform of the civil service pension system. The merger of the pension reform is scientific and reasonable, healthy and orderly and can achieve a smooth transition.展开更多
The random Dirichlet type functions on the unit ball of Cn are studied. Sufficient conditions of the multipliers of Dμ for 0 < μ≤1, if n = 1 or 0 < μ < 2 if n > 1 are given. The smoothness of random Di...The random Dirichlet type functions on the unit ball of Cn are studied. Sufficient conditions of the multipliers of Dμ for 0 < μ≤1, if n = 1 or 0 < μ < 2 if n > 1 are given. The smoothness of random Dirichlet type functions is discussed.展开更多
This paper studies a maintenance model for an one-unit degenerative system with multiple failure states based on the proportional hazards and proportional reversed hazards models. The authors investigate how the varia...This paper studies a maintenance model for an one-unit degenerative system with multiple failure states based on the proportional hazards and proportional reversed hazards models. The authors investigate how the variation of system configuration parameters have an impact on both operating and repair times and hence the system performance. Furthermore, the authors also derive the explicit expression for the long-run average cost per unit time. An algorithm to locate the optimal number of repairs in a renewal cycle is discussed as well.展开更多
基金Supported by the National Natural Science Foundation of China （ No. 60972056 ）, the Innovation Foundation of Shanghai Education Committee （ No. 09ZZ89） and Shanghai Leading Academic Discipline Project and STCSM （ No.S30108, 08DZ2231100 ）.
文摘A compressed sensing （CS） based channel estimation algorithm is proposed in the fast moving environment. A sparse basis expansion channel model in both time and frequency domain is given.Pilots are placed according to a novel random unit pilot matrix （RUPM） to measure the delay- Doppler sparse channel. The sparse channels are recovered by an extension group orthogonal matching pursuit （GOMP） algorithm, enjoying the diversity gain from multi-symbol processing. The relatively nonzero channel coefficients are estimated from a very limited number of pilots at a sampling rate significantly below the Nyquist rate. The simulation results show that the new channel estimator can provide a considerable performance improvement for the fast fading channels. Three significant reductions are achieved in the required number of pilots, memory requirements and computational complexity.
基金Supported by the National 863 Program of China （No.2006AA12Z325） and the National Natural Science Foundation of China （No.40274005）.
文摘To obtain higher accurate position estimates, the stochastic model is estimated by using residual of observations, hence, the stochastic model describes the noise and bias in measurements more realistically. By using GPS data and broadcast ephemeris, the numerical results indicating the accurate position estimates at sub-meter level are obtainable.
文摘In the reform of government organizations and institutions of China, we put forward the establishment of personal account system in occupational pension, and the introduction of the ＂account＂ management model of the non real account accumulation. This paper analyzes the current situation of personal accounts in our country, and puts forward that the account rate of bank deposit can not resist inflation, and can not reflect the real return rate of China＇s pension funds, which is not conducive to the preservation and appreciation of personal account funds. On the basis of the above, the paper puts forward that the account rate should not only consider the level of economic development and inflation, but also to adapt to the financial payment ability, and establish the personal account risk reserve fund system and other improvement measures, and strive to achieve the sustainable development of the personal account system.
基金Project(2013CB036004)supported by Basic Research Program of ChinaProjects(51378510,41302226)supported by National Natural Science Foundation of ChinaProject(2016zzts062)supported by Doctorial Innovation Foundation of Central South University,China
文摘The possible collapse of different circumstances is derived with the help of the limit analysis theory.Analytical equations related to collapsing mechanisms in deep tunnel with smooth three-centered arc cross sections are derived on the basis of Hoek-Brown failure criterion and upper bound limit analysis.The pore water pressure is considered in the analysis,as a work rate of external force.Numerical results about the shape of detaching curve and the weight of collapsing block per unit length corresponding to different parameters are obtained with the help of mathematical software.The shapes of collapsing block are drawn with respected to different parameters.Furthermore,the effects of different parameters on the shape of detaching curve and the weight of the collapsing block are discussed.
文摘Suction boxes are used in the paper industry to simultaneously drain a pulp suspension and form a fibre mat （or filter cake）. This research addresses the modelling of fibre deposition in the forming unit of an industrial papermachine, assuming a filtration process, and that of the flowing suspension drained through the building fibre mat and the wire on a suction box. From experimental data of the cumulative drained V volume, per unit surface area, for two vacuum pressures △P and 6 dwell times t, an extension of the classical law （t/V） versus V is proposed, validated and applied. This relation enables determining the average specific filtration resistance of the fibre mat over the box and the mass of solids deposited before and over the suction box. The model obtained is as precise as 1% and can be used to limit and reduce the energy consumption of drainage vacuum assisted devices such as suction boxes in the forming unit of industrial papermachines.
文摘The merger of the pension not only in relation to the social justice, but also the relationship between the construction of social security system, pensions merger is beyond doubt. Pension dual track the biggest drawback is that a significant loss of fairness, the gap between different groups of pension is too wide, causing social conflicts. The merger of the pension has be imperative. Therefore, it is necessary to establish and perfect the system of the civil service pension insurance legal mandatory occupational pension system, strengthen the basic social pension, broaden the channels for pension investment, reform organs and institutions pension system and pension system Retbrm and civil service pay rise, in order to promote the reform of the civil service pension system. The merger of the pension reform is scientific and reasonable, healthy and orderly and can achieve a smooth transition.
文摘The random Dirichlet type functions on the unit ball of Cn are studied. Sufficient conditions of the multipliers of Dμ for 0 < μ≤1, if n = 1 or 0 < μ < 2 if n > 1 are given. The smoothness of random Dirichlet type functions is discussed.
基金supported by the National Natural Science Foundation of China under Grant No.11422109
文摘This paper studies a maintenance model for an one-unit degenerative system with multiple failure states based on the proportional hazards and proportional reversed hazards models. The authors investigate how the variation of system configuration parameters have an impact on both operating and repair times and hence the system performance. Furthermore, the authors also derive the explicit expression for the long-run average cost per unit time. An algorithm to locate the optimal number of repairs in a renewal cycle is discussed as well.
