The netted radar system(NRS)has been proved to possess unique advantages in anti-jamming and improving target tracking performance.Effective resource management can greatly ensure the combat capability of the NRS.In t...The netted radar system(NRS)has been proved to possess unique advantages in anti-jamming and improving target tracking performance.Effective resource management can greatly ensure the combat capability of the NRS.In this paper,based on the netted collocated multiple input multiple output(CMIMO)radar,an effective joint target assignment and power allocation(JTAPA)strategy for tracking multi-targets under self-defense blanket jamming is proposed.An architecture based on the distributed fusion is used in the radar network to estimate target state parameters.By deriving the predicted conditional Cramer-Rao lower bound(PC-CRLB)based on the obtained state estimation information,the objective function is formulated.To maximize the worst case tracking accuracy,the proposed JTAPA strategy implements an online target assignment and power allocation of all active nodes,subject to some resource constraints.Since the formulated JTAPA is non-convex,we propose an efficient two-step solution strategy.In terms of the simulation results,the proposed algorithm can effectively improve tracking performance in the worst case.展开更多
The wide pillars are generally popular due to the high productivity and efficiency in Northwest China.The distribution of lateral abutment pressure in coal pillars is important for mining safety.To reveal the effect o...The wide pillars are generally popular due to the high productivity and efficiency in Northwest China.The distribution of lateral abutment pressure in coal pillars is important for mining safety.To reveal the effect of the first mining on the lateral abutment pressure distribution and evolution in wide pillars,an in-situ experiment,theoretical analysis and numerical simulation were performed.First,the field monitoring of lateral abutment pressure was conducted from the perspective of time and space in the Chahasu Coal Mine,Huangling No.2 Coal Mine and Lingdong Coal Mine during the first mining.Based on the field monitoring stress,a theoretical model was proposed to reveal the lateral abutment pressure distribution.The methodology was demonstrated through a case study.Aiming at the distribution mechanism,a numerical experiment was conducted through the finite-discrete element method(FDEM).Last,field observations of borehole fractures were performed to further study the damage distribution.In addition,two types of lateral abutment pressure evolution with mining advance were discussed.Suggestions on the stress monitoring layout were proposed as well.The results could provide foundations for strata control and disaster prevention in wide pillars in underground coal mines.展开更多
FPGA is an appealing platform to accelerate DNN.We survey a range of FPGA chip designs for AI.For DSP module,one type of design is to support low-precision operation,such as 9-bit or 4-bit multiplication.The other typ...FPGA is an appealing platform to accelerate DNN.We survey a range of FPGA chip designs for AI.For DSP module,one type of design is to support low-precision operation,such as 9-bit or 4-bit multiplication.The other type of design of DSP is to support floating point multiply-accumulates(MACs),which guarantee high-accuracy of DNN.For ALM(adaptive logic module)module,one type of design is to support low-precision MACs,three modifications of ALM includes extra carry chain,or 4-bit adder,or shadow multipliers which increase the density of on-chip MAC operation.The other enhancement of ALM or CLB(configurable logic block)is to support BNN(binarized neural network)which is ultra-reduced precision version of DNN.For memory modules which can store weights and activations of DNN,three types of memory are proposed which are embedded memory,in-package HBM(high bandwidth memory)and off-chip memory interfaces,such as DDR4/5.Other designs are new architecture and specialized AI engine.Xilinx ACAP in 7 nm is the first industry adaptive compute acceleration platform.Its AI engine can provide up to 8X silicon compute density.Intel AgileX in 10 nm works coherently with Intel own CPU,which increase computation performance,reduced overhead and latency.展开更多
OBJECTIVE:To assess the effectiveness and safety of acupuncture therapy for angina pectoris.METHODS:Randomized controlled trials(RCTs) concerned with acupuncture treatment of angina pectoris were identified by searchi...OBJECTIVE:To assess the effectiveness and safety of acupuncture therapy for angina pectoris.METHODS:Randomized controlled trials(RCTs) concerned with acupuncture treatment of angina pectoris were identified by searching Academic Source Premier,MEDLINE,Science Citation Index Expanded,and three Chinese databases(China biology medicine database,China national knowledge infrastructure,and VIP database for Chinese technical periodicals).The valid data were extracted in accordance with our inclusion and exclusion criteria.The main outcomes of the included studies were synthesized using Revman 5.1.RESULTS:Twenty-one articles on 16 individual studies were included and evaluated as having high or moderate risk of bias according to the standards of the Cochrane Collaboration.Meta-analysis indicated that acupuncture combined with conventional drugs(ACCD) was superior to conventional drugs alone in reducing the incidence of acute myocardial infarction(AMI) [OR=0.18,95%CI(0.04,0.84),P=0.03].Moreover,ACCD was superior to conventional drugs in the relief of angina symptoms [OR=4.23,95%CI(2.73,6.56),P<0.00001],and improvement of electrocardiography(ECG) [OR=2.61,95%CI(1.83,3.73),P<0.00001].Acupuncture by itselfwasalsosuperiortoconventionaldrugsforanginasymptoms[OR=3.59,95%CI(1.76,7.92),P=0.0004] and ECG improvement [OR=3.07,95%CI(1.54,6.10),P=0.001].ACCD was superior to conventional drugs in shortening the time to onset of angina relief [WMD=-1.40,95% CI(-1.65,-1.15),P< 0.00001].However,the time to onset was significantly longer for acupuncture treatment than for conventional treatment alone [WMD=2.43,95%CI(1.63,3.23),P<0.000 01].CONCLUSION:ACCD reduced the occurrence of AMI,and both acupuncture and ACCD relieved angina symptoms and improved ECG.However,compared with conventional treatment,acupuncture showed a longer delay before its onset of action.This indicates that acupuncture is not suitable for emergency treatment of heart attack.Owing to the poor quality of the current evidence,the findings of this systematic review need to be verified by more RCTs to enhance statistical power.展开更多
This paper investigates the problem of Joint Radar Node Selection and Power Allocation(JRNSPA)in the Multiple Radar System(MRS)in the blanket jamming environment.Each radar node independently tracks moving target and ...This paper investigates the problem of Joint Radar Node Selection and Power Allocation(JRNSPA)in the Multiple Radar System(MRS)in the blanket jamming environment.Each radar node independently tracks moving target and subsequently transmits the raw observation data to the fusion center,which formulates a centralized tracking network structure.In order to establish a practical blanket jamming environment,we suppose that each target carries the self-defense jammer which automatically implements blanket jamming to the radar nodes that exceed the preset interception probability.Subsequently,the Predicted Conditional Cramer-Rao Lower Bound(PC-CRLB)is derived and utilized as the tracking accuracy criterion.Aimed at ensuring both the tracking performance and the Low Probability of Intercept(LPI)performance,the resource-saving scheduling model is formulated to minimize the transmit power consumption while meeting the requirements of tracking accuracy.Finally,the Modified Zoutendijk Method Of Feasible Directions(MZMFD)-based two-stage solution technique is adopted to solve the formulated non-convex optimization model.Simulation results show the effectiveness of the proposed JRNSPA scheme.展开更多
基金National Natural Science Foundation of China(Grant No.62001506)to provide fund for conducting experiments。
文摘The netted radar system(NRS)has been proved to possess unique advantages in anti-jamming and improving target tracking performance.Effective resource management can greatly ensure the combat capability of the NRS.In this paper,based on the netted collocated multiple input multiple output(CMIMO)radar,an effective joint target assignment and power allocation(JTAPA)strategy for tracking multi-targets under self-defense blanket jamming is proposed.An architecture based on the distributed fusion is used in the radar network to estimate target state parameters.By deriving the predicted conditional Cramer-Rao lower bound(PC-CRLB)based on the obtained state estimation information,the objective function is formulated.To maximize the worst case tracking accuracy,the proposed JTAPA strategy implements an online target assignment and power allocation of all active nodes,subject to some resource constraints.Since the formulated JTAPA is non-convex,we propose an efficient two-step solution strategy.In terms of the simulation results,the proposed algorithm can effectively improve tracking performance in the worst case.
基金We gratefully acknowledge financial support from the National Natural Science Foundation of China(NSFC)(No.51704097)Science Foundation of Henan Polytechnic University(No.J2021–2)+1 种基金Key Research and Development Program of Henan Province,China(No.202102310244)“Science and Technology to Help the Economy 2020”Key Project(No.SQ2020YFF0426364).
文摘The wide pillars are generally popular due to the high productivity and efficiency in Northwest China.The distribution of lateral abutment pressure in coal pillars is important for mining safety.To reveal the effect of the first mining on the lateral abutment pressure distribution and evolution in wide pillars,an in-situ experiment,theoretical analysis and numerical simulation were performed.First,the field monitoring of lateral abutment pressure was conducted from the perspective of time and space in the Chahasu Coal Mine,Huangling No.2 Coal Mine and Lingdong Coal Mine during the first mining.Based on the field monitoring stress,a theoretical model was proposed to reveal the lateral abutment pressure distribution.The methodology was demonstrated through a case study.Aiming at the distribution mechanism,a numerical experiment was conducted through the finite-discrete element method(FDEM).Last,field observations of borehole fractures were performed to further study the damage distribution.In addition,two types of lateral abutment pressure evolution with mining advance were discussed.Suggestions on the stress monitoring layout were proposed as well.The results could provide foundations for strata control and disaster prevention in wide pillars in underground coal mines.
文摘FPGA is an appealing platform to accelerate DNN.We survey a range of FPGA chip designs for AI.For DSP module,one type of design is to support low-precision operation,such as 9-bit or 4-bit multiplication.The other type of design of DSP is to support floating point multiply-accumulates(MACs),which guarantee high-accuracy of DNN.For ALM(adaptive logic module)module,one type of design is to support low-precision MACs,three modifications of ALM includes extra carry chain,or 4-bit adder,or shadow multipliers which increase the density of on-chip MAC operation.The other enhancement of ALM or CLB(configurable logic block)is to support BNN(binarized neural network)which is ultra-reduced precision version of DNN.For memory modules which can store weights and activations of DNN,three types of memory are proposed which are embedded memory,in-package HBM(high bandwidth memory)and off-chip memory interfaces,such as DDR4/5.Other designs are new architecture and specialized AI engine.Xilinx ACAP in 7 nm is the first industry adaptive compute acceleration platform.Its AI engine can provide up to 8X silicon compute density.Intel AgileX in 10 nm works coherently with Intel own CPU,which increase computation performance,reduced overhead and latency.
基金Supported by the National Basic Research Program of China(973 Program) for "Basic Research on Acupoint Specificity Along Medians and its Crucial Influential Factors"(No. 2012CB518501)
文摘OBJECTIVE:To assess the effectiveness and safety of acupuncture therapy for angina pectoris.METHODS:Randomized controlled trials(RCTs) concerned with acupuncture treatment of angina pectoris were identified by searching Academic Source Premier,MEDLINE,Science Citation Index Expanded,and three Chinese databases(China biology medicine database,China national knowledge infrastructure,and VIP database for Chinese technical periodicals).The valid data were extracted in accordance with our inclusion and exclusion criteria.The main outcomes of the included studies were synthesized using Revman 5.1.RESULTS:Twenty-one articles on 16 individual studies were included and evaluated as having high or moderate risk of bias according to the standards of the Cochrane Collaboration.Meta-analysis indicated that acupuncture combined with conventional drugs(ACCD) was superior to conventional drugs alone in reducing the incidence of acute myocardial infarction(AMI) [OR=0.18,95%CI(0.04,0.84),P=0.03].Moreover,ACCD was superior to conventional drugs in the relief of angina symptoms [OR=4.23,95%CI(2.73,6.56),P<0.00001],and improvement of electrocardiography(ECG) [OR=2.61,95%CI(1.83,3.73),P<0.00001].Acupuncture by itselfwasalsosuperiortoconventionaldrugsforanginasymptoms[OR=3.59,95%CI(1.76,7.92),P=0.0004] and ECG improvement [OR=3.07,95%CI(1.54,6.10),P=0.001].ACCD was superior to conventional drugs in shortening the time to onset of angina relief [WMD=-1.40,95% CI(-1.65,-1.15),P< 0.00001].However,the time to onset was significantly longer for acupuncture treatment than for conventional treatment alone [WMD=2.43,95%CI(1.63,3.23),P<0.000 01].CONCLUSION:ACCD reduced the occurrence of AMI,and both acupuncture and ACCD relieved angina symptoms and improved ECG.However,compared with conventional treatment,acupuncture showed a longer delay before its onset of action.This indicates that acupuncture is not suitable for emergency treatment of heart attack.Owing to the poor quality of the current evidence,the findings of this systematic review need to be verified by more RCTs to enhance statistical power.
基金This study was supported by the National Natural Science Foundation of China(No.62001506).
文摘This paper investigates the problem of Joint Radar Node Selection and Power Allocation(JRNSPA)in the Multiple Radar System(MRS)in the blanket jamming environment.Each radar node independently tracks moving target and subsequently transmits the raw observation data to the fusion center,which formulates a centralized tracking network structure.In order to establish a practical blanket jamming environment,we suppose that each target carries the self-defense jammer which automatically implements blanket jamming to the radar nodes that exceed the preset interception probability.Subsequently,the Predicted Conditional Cramer-Rao Lower Bound(PC-CRLB)is derived and utilized as the tracking accuracy criterion.Aimed at ensuring both the tracking performance and the Low Probability of Intercept(LPI)performance,the resource-saving scheduling model is formulated to minimize the transmit power consumption while meeting the requirements of tracking accuracy.Finally,the Modified Zoutendijk Method Of Feasible Directions(MZMFD)-based two-stage solution technique is adopted to solve the formulated non-convex optimization model.Simulation results show the effectiveness of the proposed JRNSPA scheme.