Quantization noise caused by analog-to-digital converter(ADC)gives rise to the reliability performance degradation of communication systems.In this paper,a quantized non-Hermitian symmetry(NHS)orthogonal frequency-div...Quantization noise caused by analog-to-digital converter(ADC)gives rise to the reliability performance degradation of communication systems.In this paper,a quantized non-Hermitian symmetry(NHS)orthogonal frequency-division multiplexing-based visible light communication(OFDM-VLC)system is presented.In order to analyze the effect of the resolution of ADC on NHS OFDM-VLC,a quantized mathematical model of NHS OFDM-VLC is established.Based on the proposed quantized model,a closed-form bit error rate(BER)expression is derived.The theoretical analysis and simulation results both confirm the effectiveness of the obtained BER formula in high-resolution ADC.In addition,channel coding is helpful in compensating for the BER performance loss due to the utilization of lower resolution ADC.展开更多
Dear Editor,This letter investigates a low-complexity data-driven adaptive proportional-integral-derivative(APID)control scheme to address the output tracking problem of a class of nonlinear systems.First,the relation...Dear Editor,This letter investigates a low-complexity data-driven adaptive proportional-integral-derivative(APID)control scheme to address the output tracking problem of a class of nonlinear systems.First,the relationship between PID parameters is established to reduce the number of adjustable parameters to one.Then,based on the incremental triangular data model,a data-driven APID tracking control(DD-APIDTC)method is proposed to adjust only one controller parameter and one model parameter online,both of which have clear physical meaning.Subsequently,sufficient conditions are derived for the boundedness of the system tracking error.Finally,simulation results are given to illustrate the effectiveness of the proposed method.展开更多
Dear Editor,This letter proposes a novel Nash bargaining solution-based multiobjective model predictive control(MPC)scheme to deal with the interaction force control and the path-following problem of the constrained i...Dear Editor,This letter proposes a novel Nash bargaining solution-based multiobjective model predictive control(MPC)scheme to deal with the interaction force control and the path-following problem of the constrained interactive robot.Considering the elastic interaction force model,a mechanical trade-off always exists between the interaction force and position,which means that neither force nor path following can satisfy their desired demands completely.Based on this consideration,two irreconcilable control specifications,the force object function and the position track object function,are proposed,and a new multi-objective MPC scheme is then designed.展开更多
A novel wrist-inspired soft actuator,which is driven by a magneto-pneumatic hybrid system and based on a Kresling origami unit,is proposed.The geometric model,kinematic analysis model,and quasistatic analysis model of...A novel wrist-inspired soft actuator,which is driven by a magneto-pneumatic hybrid system and based on a Kresling origami unit,is proposed.The geometric model,kinematic analysis model,and quasistatic analysis model of the Kresling origami unit are presented.A key focus is on the formulation and investigation of the variation in rotation angle using the kinematic analysis model.A wrist-inspired soft actuator is designed,and its quasistatic characteristics are validated through various experiments.The paper proposes an innovative magneto-pneumatic hybrid actuation method,capable of achieving bidirectional torsion.This actuation method is experimentally validated,demonstrating the actuator's ability to maintain 3 steady states and its capability for bidirectional torsion deformation.Furthermore,the paper highlights the potential of the Kresling origami unit in designing soft actuators capable of achieving large rotation angles.For instance,an actuator with 6 sides(n=6)is shown to achieve a rotation angle of 239.5°,and its rotation ratio exceeds 277°,about twice the largest one reported in other literature.The actuator offers a practical and effective solution for bidirectional torsion deformation in soft robotic applications.展开更多
The coronavirus disease 2019(COVID-19)continues to have a huge impact on health care and economic systems around the world.The first question to ponder is to understand the flow of COVID-19 in the spatial and temporal...The coronavirus disease 2019(COVID-19)continues to have a huge impact on health care and economic systems around the world.The first question to ponder is to understand the flow of COVID-19 in the spatial and temporal dimensions.We collected 7 Omicron clusters outbreaks in China since the outbreak of COVID-19 as of August 2022,selected outbreak cases from different provinces and cities,and collected variable indicators that affect spillover outcomes,such as distance,migration index,PHSM index,daily reported cases number and so on.First,variables influencing spillover outcome events were assessed and analyzed retrospectively by constructing an infectious disease dynamics model and a classifier model,and secondly,the association between explanatory variables and spillover outcome events was constructed by fitting a logistics function.This study incorporates 7 influencing factors and classifies the spillover risk level into 3 levels.If different outbreak sites could be classified into different levels of spillover,it may reduce the pressure of epidemic prevention in some districts due to the lack of a uniform standard,which might be more conducive to achieving the goal of"dynamic zero".展开更多
基金supported by the National Natural Science Foundation of China(No.62201508)the Zhejiang Provincial Natural Science Foundation of China(Nos.LZ21F010001 and LQ23F010004)the State Key Laboratory of Millimeter Waves of Southeast University,China(No.K202212).
文摘Quantization noise caused by analog-to-digital converter(ADC)gives rise to the reliability performance degradation of communication systems.In this paper,a quantized non-Hermitian symmetry(NHS)orthogonal frequency-division multiplexing-based visible light communication(OFDM-VLC)system is presented.In order to analyze the effect of the resolution of ADC on NHS OFDM-VLC,a quantized mathematical model of NHS OFDM-VLC is established.Based on the proposed quantized model,a closed-form bit error rate(BER)expression is derived.The theoretical analysis and simulation results both confirm the effectiveness of the obtained BER formula in high-resolution ADC.In addition,channel coding is helpful in compensating for the BER performance loss due to the utilization of lower resolution ADC.
基金supported by the National Natural Science Foundation of China(62173002,62403010,52301408)the Beijing Natural Science Foundation(L241015,4222045)+1 种基金the Yuxiu Innovation Project of NCUT(2024NCUTYXCX111)the China Postdoctoral Science Foundation(2024M750192).
文摘Dear Editor,This letter investigates a low-complexity data-driven adaptive proportional-integral-derivative(APID)control scheme to address the output tracking problem of a class of nonlinear systems.First,the relationship between PID parameters is established to reduce the number of adjustable parameters to one.Then,based on the incremental triangular data model,a data-driven APID tracking control(DD-APIDTC)method is proposed to adjust only one controller parameter and one model parameter online,both of which have clear physical meaning.Subsequently,sufficient conditions are derived for the boundedness of the system tracking error.Finally,simulation results are given to illustrate the effectiveness of the proposed method.
基金supported by the National Natural Science Foundation of China(62303095)the Natural Science Foundation of Sichuan Province(2023NSFSC0872).
文摘Dear Editor,This letter proposes a novel Nash bargaining solution-based multiobjective model predictive control(MPC)scheme to deal with the interaction force control and the path-following problem of the constrained interactive robot.Considering the elastic interaction force model,a mechanical trade-off always exists between the interaction force and position,which means that neither force nor path following can satisfy their desired demands completely.Based on this consideration,two irreconcilable control specifications,the force object function and the position track object function,are proposed,and a new multi-objective MPC scheme is then designed.
基金supported by the National Natural Science Foundation of China(Grant Nos.91748209 and 11402229)the specialized research projects of Huanjiang Laboratory.
文摘A novel wrist-inspired soft actuator,which is driven by a magneto-pneumatic hybrid system and based on a Kresling origami unit,is proposed.The geometric model,kinematic analysis model,and quasistatic analysis model of the Kresling origami unit are presented.A key focus is on the formulation and investigation of the variation in rotation angle using the kinematic analysis model.A wrist-inspired soft actuator is designed,and its quasistatic characteristics are validated through various experiments.The paper proposes an innovative magneto-pneumatic hybrid actuation method,capable of achieving bidirectional torsion.This actuation method is experimentally validated,demonstrating the actuator's ability to maintain 3 steady states and its capability for bidirectional torsion deformation.Furthermore,the paper highlights the potential of the Kresling origami unit in designing soft actuators capable of achieving large rotation angles.For instance,an actuator with 6 sides(n=6)is shown to achieve a rotation angle of 239.5°,and its rotation ratio exceeds 277°,about twice the largest one reported in other literature.The actuator offers a practical and effective solution for bidirectional torsion deformation in soft robotic applications.
基金supported by National Key Research and Development Program of China(2021YFC2301604)the Fundamental Research Funds for the Central Universities(20720230001).
文摘The coronavirus disease 2019(COVID-19)continues to have a huge impact on health care and economic systems around the world.The first question to ponder is to understand the flow of COVID-19 in the spatial and temporal dimensions.We collected 7 Omicron clusters outbreaks in China since the outbreak of COVID-19 as of August 2022,selected outbreak cases from different provinces and cities,and collected variable indicators that affect spillover outcomes,such as distance,migration index,PHSM index,daily reported cases number and so on.First,variables influencing spillover outcome events were assessed and analyzed retrospectively by constructing an infectious disease dynamics model and a classifier model,and secondly,the association between explanatory variables and spillover outcome events was constructed by fitting a logistics function.This study incorporates 7 influencing factors and classifies the spillover risk level into 3 levels.If different outbreak sites could be classified into different levels of spillover,it may reduce the pressure of epidemic prevention in some districts due to the lack of a uniform standard,which might be more conducive to achieving the goal of"dynamic zero".
