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主成分法在优先解决卫生问题次序中的应用研究 被引量:1
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作者 钟晓妮 周燕荣 易静 《中国卫生经济》 北大核心 2003年第7期39-40,共2页
目的:采用重庆市3组不同职务卫生管理者对卫生问题评价的调查信息,探讨主成分法在优先解决卫生问题次序中的应用。方法:以主要成分贡献率为权重,计算几个主要成分权重和作为排序指标。结果:3组评价人员对卫生问题优先解决次序认识各不相... 目的:采用重庆市3组不同职务卫生管理者对卫生问题评价的调查信息,探讨主成分法在优先解决卫生问题次序中的应用。方法:以主要成分贡献率为权重,计算几个主要成分权重和作为排序指标。结果:3组评价人员对卫生问题优先解决次序认识各不相同,但卫生局局长组评价结果与3种职务综合组一致。结论:由于主成分消除了指标间相关关系对评价结果的影响,各主成分独立,故可对每个评价对象的各主成分值求和,作为综合评价值,从而得出比较客观的评价。 展开更多
关键词 主成分法 优先次序 卫生机构管理 卫生问题次序 排序指标
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抽签次序问题
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作者 潘一民 项静恬 《数学通报》 1997年第11期41-42,共2页
抽签次序问题潘一民项静恬(中科院应用数学研究所)有些习以为常的问题,多想想往往能产生新意,且看下面的例子.不少文章和教科书中,都讨论过抽签公平性的问题,例如体育场的七条跑道中,第三、四道比较理想,古典概率的计算结果表... 抽签次序问题潘一民项静恬(中科院应用数学研究所)有些习以为常的问题,多想想往往能产生新意,且看下面的例子.不少文章和教科书中,都讨论过抽签公平性的问题,例如体育场的七条跑道中,第三、四道比较理想,古典概率的计算结果表明:无论抽签时是采用先后序贯还是同... 展开更多
关键词 抽签次序问题 古典概率 全概率
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英语介词的宏观教学法
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作者 陈走明 《基础教育外语教学研究》 2003年第9期34-36,共3页
英语介词的学习是整个英语学习阶段的一个重要部分,但在介词教学的理论和实践中都存在着满足于不分次序的具体介词用法的传授的缺陷。本文从一般介词和小品词,简单介词和复杂介词,介词的基本用法和抽象用法,以及度和频率这些基本概念出... 英语介词的学习是整个英语学习阶段的一个重要部分,但在介词教学的理论和实践中都存在着满足于不分次序的具体介词用法的传授的缺陷。本文从一般介词和小品词,简单介词和复杂介词,介词的基本用法和抽象用法,以及度和频率这些基本概念出发,阐述了英语介词教学中宏观的次序问题,以期为介词教学提供指导。 展开更多
关键词 英语 介词 宏观教学法 学习阶段 语法 次序问题 中学
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A Comparison of Arithmetic Operations for Dynamic Process Optimization Approach 被引量:3
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作者 洪伟荣 谭鹏程 +1 位作者 王树青 Pu Li 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2010年第1期80-85,共6页
A comparison of arithmetic operations of two dynamic process optimization approaches called quasi-sequential approach and reduced Sequential Quadratic Programming(rSQP)simultaneous approach with respect to equality co... A comparison of arithmetic operations of two dynamic process optimization approaches called quasi-sequential approach and reduced Sequential Quadratic Programming(rSQP)simultaneous approach with respect to equality constrained optimization problems is presented.Through the detail comparison of arithmetic operations,it is concluded that the average iteration number within differential algebraic equations(DAEs)integration of quasi-sequential approach could be regarded as a criterion.One formula is given to calculate the threshold value of average iteration number.If the average iteration number is less than the threshold value,quasi-sequential approach takes advantage of rSQP simultaneous approach which is more suitable contrarily.Two optimal control problems are given to demonstrate the usage of threshold value.For optimal control problems whose objective is to stay near desired operating point,the iteration number is usually small.Therefore,quasi-sequential approach seems more suitable for such problems. 展开更多
关键词 dynamic optimization arithmetic operation comparison quasi-sequential approach simultaneous approach
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A novel PID controller tuning method based on optimization technique 被引量:5
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作者 梁昔明 李山春 HASSAN A B 《Journal of Central South University》 SCIE EI CAS 2010年第5期1036-1042,共7页
An approach for parameter estimation of proportional-integral-derivative(PID) control system using a new nonlinear programming(NLP) algorithm was proposed.SQP/IIPM algorithm is a sequential quadratic programming(SQP) ... An approach for parameter estimation of proportional-integral-derivative(PID) control system using a new nonlinear programming(NLP) algorithm was proposed.SQP/IIPM algorithm is a sequential quadratic programming(SQP) based algorithm that derives its search directions by solving quadratic programming(QP) subproblems via an infeasible interior point method(IIPM) and evaluates step length adaptively via a simple line search and/or a quadratic search algorithm depending on the termination of the IIPM solver.The task of tuning PI/PID parameters for the first-and second-order systems was modeled as constrained NLP problem. SQP/IIPM algorithm was applied to determining the optimum parameters for the PI/PID control systems.To assess the performance of the proposed method,a Matlab simulation of PID controller tuning was conducted to compare the proposed SQP/IIPM algorithm with the gain and phase margin(GPM) method and Ziegler-Nichols(ZN) method.The results reveal that,for both step and impulse response tests,the PI/PID controller using SQP/IIPM optimization algorithm consistently reduce rise time,settling-time and remarkably lower overshoot compared to GPM and ZN methods,and the proposed method improves the robustness and effectiveness of numerical optimization of PID control systems. 展开更多
关键词 PID controller optimization infeasible interior point method sequential quadratic programming SIMULATION
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Darboux Transformation and New Soliton-like Solutions for (1+1)-Dimensional Higher-Order Broer-Kaup System 被引量:1
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作者 YU Rui HUANG Ding-Jiang ZHANG Hong-Qing 《Communications in Theoretical Physics》 SCIE CAS CSCD 2006年第3期401-404,共4页
In this letter, we construct a kind of new Darboux transformation for the (1+1)-dimensional higher-order Broer-Kaup (HBK) system with the help of a gauge transformation of a spectral problem. By applying this new... In this letter, we construct a kind of new Darboux transformation for the (1+1)-dimensional higher-order Broer-Kaup (HBK) system with the help of a gauge transformation of a spectral problem. By applying this new Darboux transformation, some new soliton-like solutions of the (1+1)-dimensional HBK system are obtained. 展开更多
关键词 Darboux transformation (1+1)-dimensional higher-order Broer-Kaup system soliton-like solu-tions
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趣题二则
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作者 杨玉山 《中小学数学(初中版)》 2003年第10期30-31,共2页
关键词 座位次序问题 初中 数学 代数问题 解法
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Bivariate Gonarov polynomials and integer sequences
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作者 KHARE Niraj LORENTZ Rudolph YAN Catherine Huafei 《Science China Mathematics》 SCIE 2014年第8期1561-1578,共18页
Univariate Gonarov polynomials arose from the Goncarov interpolation problem in numerical analysis.They provide a natural basis of polynomials for working with u-parking functions,which are integer sequences whose ord... Univariate Gonarov polynomials arose from the Goncarov interpolation problem in numerical analysis.They provide a natural basis of polynomials for working with u-parking functions,which are integer sequences whose order statistics are bounded by a given sequence u.In this paper,we study multivariate Goncarov polynomials,which form a basis of solutions for multivariate Goncarov interpolation problem.We present algebraic and analytic properties of multivariate Gonarov polynomials and establish a combinatorial relation with integer sequences.Explicitly,we prove that multivariate Goncarov polynomials enumerate k-tuples of integers sequences whose order statistics are bounded by certain weights along lattice paths in Nk.It leads to a higher-dimensional generalization of parking functions,for which many enumerative results can be derived from the theory of multivariate Goncarov polynomials. 展开更多
关键词 Goncarov polynomials INTERPOLATION parking functions order statistics
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