2篇
您的检索式：作者名="MA SongShan"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Weak signal detection method based on Duffing oscillator with adjustable frequency显示文摘In this paper, we present a new system of weak signal detection based on Duffing oscillator with adjustable frequency, in which the frequency of periodic driving force signal can be fixed at a certain value and make the system to be in a same critical chaotic state. Therefore, by adjusting an adjustable signal frequency,the detection system we propose can detect signals of different frequencies in the same critical chaotic state, and overcome the limitation of the previous system which can only detect a signal of a specific frequency in a critical chaotic state. Meanwhile, we analyzed its system performance according to simulation and designed the circuit of the system. Based on the results of simulation and actual condition, we find the system is effective for weak signal detection. We can also find that in the proposed system, the signal detection accuracy increases firstly and then decreases with the increase in amplitude of adjustable signal, while the input noise variance is fixed.In addition, in the improved system, the smaller the variance of the input noise is, the higher the detection accuracy is, and the wider the adjustable operating range is. | MA SongShan LU Ming DING JiaFeng HUANG Wei YUAN Hong | 2015 | Science China(Information Sciences)2015，58，10： | 4 |
| 2 | Geographic modeling and simulation systems for geographic research in the new era: Some thoughts on their development and construction显示文摘Regionality,comprehensiveness,and complexity are regarded as the basic characteristics of geography.The exploration of their core connotations is an essential way to achieve breakthroughs in geography in the new era.This paper focuses on the important method in geographic research:Geographic modeling and simulation.First,we clarify the research requirements of the said three characteristics of geography and its potential to address geo-problems in the new era.Then,the supporting capabilities of the existing geographic modeling and simulation systems for geographic research are summarized from three perspectives:Model resources,modeling processes,and operational architecture.Finally,we discern avenues for future research of geographic modeling and simulation systems for the study of regional,comprehensive and complex characteristics of geography.Based on these analyses,we propose implementation architecture of geographic modeling and simulation systems and discuss the module composition and functional realization,which could provide theoretical and technical support for geographic modeling and simulation systems to better serve the development of geography in the new era. | Min CHEN Guonian LV Chenghu ZHOU Hui LIN Zaiyang MA Songshan YUE Yongning WEN Fengyuan ZHANG Jin WANG Zhiyi ZHU Kai XU Yuanqing HE | 2021 | Science China Earth Sciences2021，64，8： | 3 |
您所在的机构暂未开通此部分的功能，请联系管理员