Reliability-based Robust Optimization Design of Automobile Components with Non-normal Distribution Parameters

In the reliability designing procedure of the vehicle components, when the distribution styles of the random variables are unknown or non-normal distribution, the result evaluated contains great error or even is wrong if the reliability value R is larger than 1 by using the existent method, in which case the formula is necessary to be revised. This is obviously inconvenient for programming. Combining reliability-based optimization theory, robust designing method and reliability based sensitivity analysis, a new method for reliability robust designing is proposed. Therefore the influence level of the designing parameters’ changing to the reliability of vehicle components can be obtained. The reliability sensitivity with respect to design parameters is viewed as a sub-objective function in the multi-objective optimization problem satisfying reliability constraints. Given the first four moments of basic random variables, a fourth-moment technique and the proposed optimization procedure can obtain reliability-based robust design of automobile components with non-normal distribution parameters accurately and quickly. By using the proposed method, the distribution style of the random parameters is relaxed. Therefore it is much closer to the actual reliability problems. The numerical examples indicate the following: (1) The reliability value obtained by the robust method proposed increases (】0.04%) comparing to the value obtained by the ordinary optimization algorithm; (2) The absolute value of reliability-based sensitivity decreases (】0.01%), and the robustness of the products’ quality is improved accordingly. Utilizing the reliability-based optimization and robust design method in the reliability designing procedure reduces the manufacture cost and provides the theoretical basis for the reliability and robust design of the vehicle components.

A new early warning method for dam displacement behavior based on non-normal distribution function

Traditional methods for early warning of dam displacements usually assume that residual displacements follow a normal distribution.This assumption deviates from the reality,thereby affecting the reliability of early warning results and leading to misjudgments of dam displacement behavior.To solve this problem,this study proposed an early warning method using a non-normal distribution function.A new early warning index was developed using cumulative distribution function(CDF)values.The method of kernel density estimation was used to calculate the CDF values of residual displacements at a single point.The copula function was used to compute the CDF values of residual displacements at multiple points.Numerical results showed that,with residual displacements in a non-normal distribution,the early warning method proposed in this study accurately reflected the dam displacement behavior and effectively reduced the frequency of false alarms.This method is expected to aid in the safe operation of dams.

Riemann Boundary Value Problem of Non-Normal Type on the Infinite Straight Line

Various kinds of Riemann boundary value problems (BVPs) for analytic functions on closed curves or on open arc, doubly periodic Riemann BVPs, doubly quasi-periodic Riemann BVPs, and BVPs for polyanalytic functions have been widely investigated in [1-8]. The main ap- proach is to use the decomposition of polyanalytic functions and their generalization to transform the boundary value problems to their corresponding boundary value problems for analytic functions. Recently, inverse Riemann BVPs for generalized analytic functions or bianalytic functions have been investigated in [9-12]. In this paper, we consider a kind of Riemann BVP of non-normal type on the infinite straight line and discuss the solvable conditions and the general solution for it.

Non-normal Hasemann Boundary Value Problem

We will discuss the non-normal Hasemann boundary value problem: we may find these results are coincided with those of normal Hasemann boundary value problem and non-normal Riemann boundary value problem.

Doubly Periodic Riemann Boundary Value Problem of Non-Normal Type for Analytic Functions on Two Parallel Curves

In this paper, we present and study a kind of Riemann boundary value problem of non-normal type for analytic functions on two parallel curves. Making use of the method of complex functions, we give the method for solving this kind of doubly periodic Riemann boundary value problem of non-normal type and obtain the explicit expressions of solutions and the solvable conditions for it.

Strong T-Stability of Picard Iteration in a Non-Normal Cone Metric Space

Let(X,d)be a cone metric space and T:X!X be a mapping.In this paper,we shall introduce the concept of strong T-stability of fixed point iteration procedures with respect to T in cone metric spaces.Also,we will investigate some meaningful results on strong T-stability of Picard iterations in cone metric spaces without the assumption of normality.Our main results improve and generalize some related results in the literature.

Finite p-groups whose non-normal subgroups have few orders

Suppose that G is a finite p-group. If G is not a Dedekind group, then G has a non-normal subgroup. We use p^M（G） and p^m（G） to denote the maximum and minimum of the orders of the non-normal subgroups of G, respectively. In this paper, we classify groups G such that M（G） 〈 2m（G） ^- 1. As a by-product, we also classify p-groups whose orders of non-normal subgroups are p^k and p^k＋1.

ON THE NON-NORMAL OPERATORS——SEMI-HYPONORMAL OPERATORS

Let A be a linear operator in a Hilbert space H such that Q=（A*A）1/2-（AA*）1/2≥0 andlet A=UR be the polar decomposition. Then there exist opeators A+=lim U*nAUn and A-=lim Un AU*n.In this paper, the relations between the spectra of A+, A-,R and U are derived. Asingular integral model of the operator A is presented. Finally we shall prove the inequality ||Q||≤μφ（σ（A））/2π under certain conditions.

A FRAMEWORK OF SETTING UP GOAL CONTROL LIMITS OF TARGET COSTING FOR NON-NORMAL DISTRIBUTIONS

This study provides a framework of target costing to extend its original scope when the underlying distribution is non-normal. The new specification limits can be derived by listening to the market price from Taguchi loss function. Later, the new specification limits can be linked through the non-normality-based C^^pk value along with non-normality-based X^^-Rcontrol charts to derive goal control limits. Moreover, an example is provided to illustrate the usefulness of the proposed framework of target costing by relentlessly reducing cost and improving product quality to gain competitiveness in the marketplace.

RQI DYNAMICS FOR NON-NORMAL MATRICES WITHREAL EIGENVALUES

RQI is an approach for eigenvectors of matrices. In 1974, B.N Parlett proved that it was a ''succeessful algorithm'' with cubic convergent speed for normal matrices. After then, several authors developed relevant theory and put this research into dynamical frame. [3] indicated that RQI failed for non-normal matrices with complex eigenvalues. In this paper, RQI for non-normal matrices with only real spectrum is analyzed. The authors proved that eigenvectors are super-attractive fixed points of RQI. The geometrical and topological behaviours of two periodic orbits are considered too. The existness of three or higher periodic orbits and their geometry are considered too. The existness of three or higher periodic orbits and their geometry are still open and of interest. It will be reported in our forthcomming paper.

非师范类新教师规范化培训方案设计与实践及质量评估与改进——以F省为例

非师范类新教师因未经过系统的师范教育,普遍存在从教初期的适应困难。鉴于此,提出应对非师范新教师开展规范化培训,并以F省为例,通过梳理非师范新教师的特点与培训需求,探讨非师范新教师培训方案和运行机制,以提升新教师的职业适应能力。同时,探讨培训的质量评估与反馈,以期为非师范教师培养培训方案的完善提供借鉴。

基于教学审定模式的非师范类新入职教师教学能力培养

基于当前学校教师培养现状,针对非师范类新入职教师教学能力提高问题,分别从入职后业务能力培训、指导带教组织形式、教学审定工作的实施和新入职教师教学能力自我提升等方面进行研究,提出一套基于教学审定模式的新入职教师业务能力培养的带教机制,对于提高非师范类新入职教师教学能力具有一定参考意义。

冰球和钨珠非正冲击下T800-CFRP层合板损伤特性的研究

通过试验和仿真相结合的方法研究了T800碳纤维增强复合材料(CFRP)层合板在冰球和钨珠非正冲击作用下的损伤特性。首先开展了冰球和钨珠在给定工况下高速撞击T800-CFRP层合板试验,以此对仿真模型的有效性进行验证;然后讨论了T800-CFRP层合板在两种冲击体以不同冲击能量与冲击角度作用下的损伤特性及其差异性。研究表明:钨珠在冲击能量较低时就能对层合板造成穿孔损伤,但随着冲击能量增大层合板的损伤程度呈下降趋势;冰球对层合板造成损伤的冲击能量阈值与钨珠的相比要高很多,且随着冲击能量的增加损伤程度明显加剧;钨珠在冲击角度为45°和60°时造成的损伤与正冲击的情况相比要更加严重,而冲击角度为30°时造成的损伤却小于正冲击的情况;冰球冲击时,层合板的损伤程度随冲击角度的增加而减小。该研究有助于深化对T800-CFRP层合板在冲击载荷作用下的损伤与破坏行为的认识,具有重要的科学意义和工程应用价值。

基于GMM-Ada-LASSO模型的高维过程统计质量监控方法

针对高维数据往往不服从正态分布导致统计监控模型识别精度低、监控效率差的问题,文章提出一种基于高斯混合模型的变量选择控制图方法。首先,利用高斯混合模型将高维过程分解成若干个服从正态分布的子分布;然后,运用Adaptive LASSO算法识别潜在异常变量;最后,构建多元EWMA控制图实现高维过程统计质量监控。通过仿真实验,在六种不同情形下对所提方法的监控性能进行测试。结果表明,与传统MEW⁃MA和VS-MEWMA控制图相比,所提监控方法对非正态数据具有较强的稳健性,对高维过程具有良好的监控性能。

频域互相关的间接飞行时间相机深度图配准

由于间接飞行时间(indirect time-of-flight,iTOF)相机存在空间非均匀性照明的问题,在进行深度图平移配准时,会导致像平面外围区域的测量深度误差较大,影响后续深度配准的准确性.为解决该问题导致的错配情况,提出一种加掩码的频域归一化互相关(normalization cross-correlation,NCC)深度配准方法.对和待配准深度图同一帧的灰度图进行加掩码处理,将非均匀区域掩蔽,然后使用频域的NCC方法进行配准,最后用配准得到的平移向量对两幅对应帧的深度图进行叠加,完成深度配准.该方法在4%的尺度缩放范围内,可以实现正确配准,水平方向的像素相对误差可以达到1.97%,垂直方向像素相对误差可以达到1.74%,且误差符合正态分布.该配准方法具有稳定性和可靠性,可以解决由非均匀性照明引起的深度错配问题.

正常高值血压早期非药物干预研究进展

围绕正常高值血压的流行病学现状、危险因素、危害及非药物干预措施等进行综述,以期为制定正常高值血压的一级预防策略、实施临床干预措施提供参考。

语气副词“怪不得”的评价表达与反预期分析

从交际互动视角出发,对语气副词“怪不得”的评价功能进行探讨。“怪不得”话语的因果类型可以分为常态因果和异态因果,前者包含正面评价和负面评价,后者则负面评价倾向突出。“怪不得”的评价差异也体现在文体方面,新闻媒体中以正面评价为主,文学作品和社交网络中则负面评价明显。同时,对“怪不得”的句法、语义、语用进行全面考察,揭示语言资源在其评价表达中的调配情况。就两者的关联来说,反预期是“怪不得”评价表达的充分不必要条件。在常态因果中,超预期引起正面评价,负预期引起负面评价;在异态因果下,负面评价占据统摄地位,但未必都是由负预期引起的结果。

常化处理对无取向硅钢组织及磁性能的影响

利用金相显微镜、SEM&EDS和TEM研究了不同常化温度对无取向硅钢样品的组织结构和析出行为,并利用VSM研究了它们对磁性能的影响。结果表明,温度达950℃常化处理样品的晶粒发生了完全再结晶,并随着常化温度升高,晶粒逐渐长大,形成等轴晶,其成品退火板晶粒平均尺寸最大。样品中的析出相主要为AlN,并伴有少量AlN-MnS复合相。理论计算发现微米级析出相的钉扎力均小于其晶界生长的驱动力,因此析出相难以起到阻碍晶粒长大的作用。不同常化温度处理的样品的饱和磁感应强度均低于热轧板的,但随着常化温度的升高,饱和磁感应强度在950℃达到峰值。

“乎井术”针刺疗法治疗慢性非萎缩性胃炎临床研究

目的:观察长桑君脉法“乎井术”针刺疗法对缓解慢性非萎缩性胃炎临床症状的临床疗效。方法:回顾分析2020年6月—2022年10月到广州中医药大学顺德医院顺峰山门诊和三门诊就诊,且治疗方案采用了长桑君脉法“乎井术”针刺疗法的慢性非萎缩性胃炎患者资料。比较患者治疗前后的中医证候积分,并统计临床疗效、症状缓解时间及不良反应。结果:治疗后患者腹痛、腹胀、胸胁胀痛、烧心、呃逆、恶心等中医证候积分均降低(P<0.05)。临床治疗总有效率91.71%。不良反应发生率0.55%。治疗后患者各不适症状均在2~4 min左右可得到缓解。结论:“乎井术”针刺治疗能迅速缓解患者临床症状,解除患者痛苦,操作简便,安全有效。

终轧温度与常化时间对高强无取向硅钢析出物的影响

系统研究了不同终轧温度及常化时间对高强无取向硅钢中析出物析出行为的影响,结果表明:常化板、冷轧脱碳板和成品板中析出物类型相似,主要包括AlN+Nb(C, N)+Ti(C, N)复合析出物及以AlN和Ce(S, O)为中心的球状含稀土复合析出物。适当提高终轧温度、延长常化时间,常化板中析出物尺寸增大,面密度下降,且此趋势最终遗传到成品板中。终轧温度为1 000℃、常化时间为5 min时,成品板析出物尺寸集中分布在0.3~1.0μm范围内,析出物面密度为79个/1 000μm^(2)。