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一种新的评估末敏弹扫描参数对目标影响模型 被引量:3
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作者 韩广超 王锋 +2 位作者 赵河明 张锋 赵欢欢 《弹箭与制导学报》 CSCD 北大核心 2017年第3期35-38,共4页
为了研究末敏弹稳态扫描参数对目标的影响,提出了一种评估末敏弹扫描参数对目标影响的模型。建立了稳态扫描参数影响下的末敏子弹对目标影响模型,并运用MATLAB提供的非线性规划最优化理论进行了仿真。仿真结果表明:当转速为5 r/s,落速为... 为了研究末敏弹稳态扫描参数对目标的影响,提出了一种评估末敏弹扫描参数对目标影响的模型。建立了稳态扫描参数影响下的末敏子弹对目标影响模型,并运用MATLAB提供的非线性规划最优化理论进行了仿真。仿真结果表明:当转速为5 r/s,落速为9 m/s,扫描角为30°,敏感器探测距离为115~145 m时,末敏子弹最适宜作用目标。所提出的研究思路与方法为末敏弹设计提供一定的帮助,研究内容对分析末敏弹作战效能具有一定的指导意义。 展开更多
关键词 稳态扫描 MATLAB 非线性规划最优化 敏感器
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煮糖过程的新型建模方法
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作者 杨继君 徐辰华 《甘蔗糖业》 2003年第4期47-51,46,共6页
煮糖过程的主要非线性表现为晶体生长率。本论文采用两种方法来描述晶体生长率模型的设计,第1种方法是通过采用非线性规划最优化方法(NLP)决定晶体生长率经验公式的参数;第2种方法是一种新颖的建模策略,它把晶体生长率作为非线性逼近器... 煮糖过程的主要非线性表现为晶体生长率。本论文采用两种方法来描述晶体生长率模型的设计,第1种方法是通过采用非线性规划最优化方法(NLP)决定晶体生长率经验公式的参数;第2种方法是一种新颖的建模策略,它把晶体生长率作为非线性逼近器的人工神经网络(ANN)与由蔗糖晶体质量平衡所表述的先前既定的知识相结合。最初结果显示第1种类型的模型能够较好地执行局部匹配,而第2种具有更大的灵活性。 展开更多
关键词 煮糖过程 建模方法 晶体生长率模型 非线性规划最优化方法 人工神经网络 蔗糖结晶
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Global Convergence of a New Conjugate Gradient Methods with a Modification of the Curry-Altman Step-size Rule
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作者 CAOLi-hua SUNQing-ying 《Chinese Quarterly Journal of Mathematics》 CSCD 2004年第2期198-204,共7页
Conjugate gradient optimization algorithms depend on the search directions with different choices for the parameter in the search directions. In this note, conditions are given on the parameter in the conjugate gradie... Conjugate gradient optimization algorithms depend on the search directions with different choices for the parameter in the search directions. In this note, conditions are given on the parameter in the conjugate gradient directions to ensure the descent property of the search directions. Global convergence of such a class of methods is discussed. It is shown that, using reverse modulus of continuity function and forcing function, the new method for solving unconstrained optimization can work for a continuously differentiable function with a modification of the Curry-Altman's step-size rule and a bounded level set. Combining PR method with our new method, PR method is modified to have global convergence property.Numerical experiments show that the new methods are efficient by comparing with FR conjugate gradient method. 展开更多
关键词 nonlinear programming forcing function reverse modulus of continuity function convergence
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Evolution Handoff Strategy for Real-Time Video Transmission over Practical Cognitive Radio Networks 被引量:1
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作者 LIU Fa MA Yongkui +1 位作者 ZHAO Honglin DING Kai 《China Communications》 SCIE CSCD 2015年第2期141-154,共14页
The transmission delay of realtime video packet mainly depends on the sensing time delay(short-term factor) and the entire frame transmission delay(long-term factor).Therefore,the optimization problem in the spectrum ... The transmission delay of realtime video packet mainly depends on the sensing time delay(short-term factor) and the entire frame transmission delay(long-term factor).Therefore,the optimization problem in the spectrum handoff process should be formulated as the combination of microscopic optimization and macroscopic optimization.In this paper,we focus on the issue of combining these two optimization models,and propose a novel Evolution Spectrum Handoff(ESH)strategy to minimize the expected transmission delay of real-time video packet.In the microoptimized model,considering the tradeoff between Primary User's(PU's) allowable collision percentage of each channel and transmission delay of video packet,we propose a mixed integer non-linear programming scheme.The scheme is able to achieve the minimum sensing time which is termed as an optimal stopping time.In the macro-optimized model,using the optimal stopping time as reward function within the partially observable Markov decision process framework,the EHS strategy is designed to search an optimal target channel set and minimize the expected delay of packet in the long-term real-time video transmission.Meanwhile,the minimum expected transmission delay is obtained under practical cognitive radio networks' conditions,i.e.,secondary user's mobility,PU's random access,imperfect sensing information,etc..Theoretical analysis and simulation results show that the ESH strategy can effectively reduce the transmission delay of video packet in spectrum handoff process. 展开更多
关键词 practical cognitive radio networks spectrum handoff process partially observable Markov decision process video transmission
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