Cyclic codes over R = Fp + uFp +?+ uFp with length pn

In this paper, all cyclic codes with length p^sn, (n prime to p) over the ring R = F_p + uF_p +?+ u^k−1F_p are classified. It is first proved that Tor_j(C) is an ideal of , so that the structure of ideals over extension ring S_u^k(m,ω)=GR(u^k,m)[ω]/〈ω^ps-1〉 is determined. Then, an isomorphism between R[X]/〈X^N − 1〉 and a direct sum ⊕_h∈IS_u^k(m_h,ω) can be obtained using discrete Fourier transform. The generator polynomial representation of the corresponding ideals over F_p + uF_p +?+ u^k−1F_p is calculated via the inverse isomorphism. Moreover, torsion codes, MS polynomial and inversion formula are described.     

一种分数阶内模TIλDemμ控制器设计方法

针对整数阶、 分数阶被控对象,提出了一种分数阶内模TI^λD^μ控制器的设计方法．首先对原被控模型进行降阶处理,得到二阶分数阶延时系统模型．然后将内模控制思想引入到降阶模型,设计内模控制器G_IMC（s）．最后将G_IMC（s）与所提的新型TI^λD^μ控制器进行参数对照,能够清晰地得出参数间的对应关系,从而得出分数阶TI^λD^μ的各参数．仿真结果表明,TI^λD^μ控制器能够获得良好的控制品质和鲁棒性．     

The B<Subscript>4</Subscript>-valued propositional logic with unary logical connectives ~<Subscript>1</Subscript> / ~<Subscript>2</Subscript> /¬

A B ₄-valued propositional logic will be proposed in this paper which there are three unary logical connectives ~₁, ~₂, ¬ and two binary logical connectives ∧, ∨, and a Gentzen-typed deduction system will be given so that the system is sound and complete with B ₄-valued semantics, where B ₄ is a Boolean algebra.     

非线性M IMO 系统H 2 öH ∞模糊输出反馈控制

研究了非线性MIMO系统H2／H∞模糊输出反馈控制问题．采用局部线性化方法，用T—S模糊线性模型逼近非线性系统．在希望的H∞干扰抑制约束下，通过最小化H2控制性能指标，实现了模糊输出反馈次优控制．通过将优化问题转化成特征值问题(EVP)，应用线性矩阵不等式(LMI)优化方法求解，简化了问题的求解过程．所设计的闭环系统在平衡点是局部二次型稳定的，系统抗扰性能和动态性能均较好．     

基于遗传算法的混合H 2 öH ∞状态反馈控制器

提出了应用遗传算法设计混合H2/H∞状态反馈控制器的一种方法.通过遗传算法对H∞控制器进行H2性能优化,从而设计出鲁棒性强并满足系统性能要求的混合H2/H∞状态反馈控制器.该方法采用实数编码、排序选择与最佳个体保存相结合的选择算子、实值中间重组的交叉算子和实值变异的变异算子,并在适应度函数中添加惩罚约束.对国产某型飞机进行仿真,结果表明得到的混合H2/H∞状态反馈控制器具有良好的H∞性能和H2性能.     

基于遗传算法的混合降阶H 2 öH ∞控制器

讨论了混合降阶H2/H∞控制器的设计问题,提出了应用遗传算法设计混合降阶H2/H∞控制器的一种方法.通过遗传算法对次优H∞降阶控制器进行H2性能优化,设计出鲁棒性既强又满足系统性能要求的混合降阶H2/H∞控制器.它分别在H∞降阶和H2性能优化中两次应用遗传算法,遗传算法采用实数编码形式,其算子分别选用排序选择和最佳个体保存相结合的选择算子、实值中间重组的交叉算子及实值变异的变异算子.利用国产某型飞机对该方法进行仿真,其结果表明得到的混合降阶H2/H∞控制器具有良好的H∞性能和H2性能.     

二/三阶三角Bézier 曲线

构造了两组由三角函数形成的基函数,并由这两组基函数定义了两种新的 曲线,分别称为二阶、三阶T-Bézier 曲线。这两种曲线分别具有和二次Bézier 曲线、三次Bézier 曲线一样简单的结构,而且都具有Bézier 曲线的基本性质,如凸包性、对称性、几何不变 性、端点插值和端边相切性。此外,在普通Bézier 曲线的G1 光滑拼接条件下,二阶T-Bézier 曲线可以达到G3 光滑拼接,三阶T-Bézier 曲线可以达到G2 光滑拼接。另外,给出了用二阶 T-Bézier 曲线来构造与给定多边形相切的曲线的方法,该方法简单有效,而且曲线对给定的 多边形是保形的。     

Discrete-time <Emphasis Type="Italic">MAP/G</Emphasis>/1/∞ system with inversive probabilistic servicing discipline

Consideration was given to the discrete-time MAP/G/1/∞ queuing system where the arriving customer is taken to the server with a certain probability depending only of the processed length of the customer in service and squeezes out its predecessor to the first place on the queue or, with the complementary probability, occupies the first place on the queue (inversive probabilistic servicing discipline). For this system, the main stationary operational characteristics were established.     

A two-phase <Emphasis Type="Italic">GI</Emphasis>/<Emphasis Type="Italic">PH</Emphasis>/1 → ·/<Emphasis Type="Italic">PH</Emphasis>/1/0 system with losses

We find a stationary distribution and productivity characteristics for a two-phase queueing system with recurrent input flow. The servicing units are single-line on both phases. The servicing times have phase-type distributions. On the first phase, there is an infinite buffer. There is no intermediate buffer. In case the second phase device is busy at the time a claim has finished going through the first phase, this claim leaves the system unserved (is lost).     

Structure and humidity sensing properties of La1−xKxCo0.3Fe0.7O3−δ perovskite

The effects of K-substitution at La-site of La_1−xK_xCo_0.3Fe_0.7O_3-δ perovskite on its structure and humidity sensing properties were studied in detail. The XRD, SEM-EDS, N₂ adsorption-desorption measurements (BET), ICP-AES and XPS were used to characterize the microstructure of La_1−xK_xCo_0.3Fe_0.7O_3−δ perovskite. The results show that the partial substitution of K at La-site has no obvious effect on the crystal phase, morphology and surface area of samples, but leads to the increased oxygen vacancies and surface enriched K⁺. The sensitivity of humidity sensor based on all samples was evaluated by measuring the impedance response to the humidity changes. The partial substitution of K at La-site significantly enhanced the humidity sensitivity of La_1−xK_xCo_0.3Fe_0.7O_3−δ perovskite at low relative humidity (RH). By correlating the structure of material with its sensing properties, the probable reasons that lead to the remarkable sensitivity enhancement of the K-substitution samples compared with the unsubstituted sample (LaCo_0.3Fe_0.7O_3−δ) were given; moreover, the sensing mechanism was also discussed by the complex impedance spectra in detail.     

短时延网络控制系统的鲁棒H 2 öH ∞状态观测器设计

针对受白噪声干扰的短时延网络控制系统,将随机时延对系统的影响转化为未知有界不确定项,在不改变闭环系统结构的前提下,利用鲁棒控制理论提出了系统的H2/H∞状态观测器设计方法;证明了所设计状态观测器估计输出对随机时延引起的不确定项的H∞鲁棒性,给出了估计输出对白噪声干扰的鲁棒H2性能指标的求解方法和观测器增益阵的确定方法.最后通过仿真实例证实了所设计状态观测器的有效性和鲁棒性.     

基于多尺度H/A/α分解的全极化HRRP特征提取

针对现有基于H/A/α 分解的全极化高分辨率距离像(HRRP) 特征提取方法没有考虑度量尺度对特征性能的影响问题, 引入动态互信息思想设计了度量尺度评价准则, 并提出了基于平均度量尺度、不定度量尺度和金字塔型度量尺度3 种特征提取方法. 采用两类飞机目标全极化HRRP 数据对提取的特征子集进行了有效性分析, 并通过识别多类飞机目标验证了3 种方法提取的特征子集具有良好的类别可分性和稳定性.     

The evaluation of pedestrians’ behavior using <Emphasis Type="Italic">M/G/C/C</Emphasis> analytical,weighted distance and real distance simulation models

M/G/C/C analytical and simulation models have long been used to evaluate the performance of a large and complex topological network. However, such evaluation is only founded on a network’s total arrival rate and its weighted distance. Thus, this paper discusses some concepts and issues in building an M/G/C/C simulation model of a complex geometric system where all its arrival sources and their exact distances to the end of their networks (i.e., corridors) have been taken into consideration in measuring the impacts of various evacuation rates to its throughput, blocking probability, expected service time and expected number of pedestrians. For this purpose, the Dewan Tuanku Syed Putra hall, Universiti Sains Malaysia, Malaysia has been selected as a case study for various evaluations of complex pedestrian flows. These results were analyzed and compared with the results of our analytical and weighted distance simulation models. We then documented the ranges of arrival rates for each of the model where their results exhibited significant discrepancies and suggest ideal rates to best evacuate occupants from the hall. Our model can be utilized by policy makers to recommend suitable actions especially in emergency cases and be modified to build and measure the performance of other real-life complex systems.