Using the Method of Maximizing Deviation to Make Decision for M ultiindices

This paper takes the synthesizing evaluation about industrial economic benefits by examples and proposes a new method named maximizing deviation method for multiindices decision. The new method can automatically determine the weight coefficients among the multiindices and also can obtain the exact and reliable evaluation results without subjectivity.

SMALL PERTURBATION CRAMER METHODS AND MODERATE DEVIATIONS FOR MARKOV PROCESSES

This paper presents a small perturbation Cramer method for obtaining the large deviation principle of a family of measures (β,ε> 0) on a topological vector space. As an application, we obtain the moderate deviation estimations for uniformly ergodic Markov processes.

A LARGE DEVIATION PRINCIPLE FOR THE STOCHASTIC GENERALIZED GINZBURG-LANDAU EQUATION DRIVEN BY JUMP NOISE

In this paper,we establish a large deviation principle for the stochastic generalized Ginzburg-Landau equation driven by jump noise.The main difficulties come from the highly non-linear coefficient and the jump noise.Here,we adopt a new sufficient condition for the weak convergence criterion of the large deviation principle,which was initially proposed by Matoussi,Sabbagh and Zhang(2021).

Maximizing deviation method for multiple attribute decision making under q-rung orthopair fuzzy environment

Because of the uncertainty and subjectivity of decision makers in the complex decision-making environment,the evaluation information of alternatives given by decision makers is often fuzzy and uncertain.As a generalization of intuitionistic fuzzy set(IFSs)and Pythagoras fuzzy set(PFSs),q-rung orthopair fuzzy set(q-ROFS)is more suitable for expressing fuzzy and uncertain information.But,in actual multiple attribute decision making(MADM)problems,the weights of DMs and attributes are always completely unknown or partly known,to date,the maximizing deviation method is a good tool to deal with such issues.Thus,combine the q-ROFS and conventional maximizing deviation method,we will study the maximizing deviation method under q-ROFSs and q-RIVOFSs in this paper.Firstly,we briefly introduce the basic concept of q-rung orthopair fuzzy sets(q-ROFSs)and q-rung interval-valued orthopair fuzzy sets(q-RIVOFSs).Then,combine the maximizing deviation method with q-rung orthopair fuzzy information,we establish two new decision making models.On this basis,the proposed models are applied to MADM problems with q-rung orthopair fuzzy information.Compared with existing methods,the effectiveness and superiority of the new model are analyzed.This method can effectively solve the MADM problem whose decision information is represented by q-rung orthopair fuzzy numbers(q-ROFNs)and whose attributes are incomplete.

Spectrum Deviation Method of Identification of Foreshocks or Generalized Foreshocks and Its Applications

Based on previous research work,we present a spectrum deviation method to recognize a foreshock or generalized foreshock in this paper. The criterion to determine whether an event is a foreshock is a wide spectrum for an ordinary event,however,a moderate earthquake with foreshock or generalized foreshock has the characteristics of a narrow frequency band,and it deviates to the low frequency. It may be explained by metastable extension in the rupture source or related area of the main shock or regional fragmentation damage and crack nucleation process. The calculation results of two foreshocks,the M_S4. 7 event which occurred before the Yushu M_S7. 1 earthquake on April 14,2010 and the M_S5. 3 event which occurred before the Yutian M_S7. 3 earthquake on February 12,2014,show that the spectra of foreshocks shift,and they are quite different from the nonforeshock seismic spectrum of equivalent size. Therefore,this result can verify the validity of the spectrum deviation method.

NONLINEAR BUCKLING ANALYSIS OF TUBING IN DEVIATED WELLS BY FINITE ELEMENT METHOD

The equilibrium equations and the functional for tubing buckling in arbitrary straight wells are derived. The entire buckling process of tubing in deviated wells is analyzed for the first time by utilizing the finite element method. The effects of gravity and torques on the buckling are included in the analyses and the calculated results are well compared with existing solutions. It is shown that the buckling only occurs at the lower portion of the tubing where the axial load is the largest, and the contact force of the well, the bending moment of the tubing and the buckling displacement of this portion vary periodically. The buckling spreads upwards from the bit with the increase of axial load. There is no buckling at the upper portion of the tubing where the bending moment is zero. And the contact force of this section increases only slightly with the increase of the axial load. With the increase of the deviation angle, the length of buckling portion and buckling displacement amplitude decrease, the contact force increases with the increase of load at the upper portion and its amplitude decreases at the lower buckling section, the bending moment remains zero at the upper portion and its amplitude decreases at the lower buckling portion. The buckling displacement increases with the increase of the torque, but the increment is very small.

Discontinuous penalty approach with deviation integral for global constrained minimization

In this paper, we use the discontinuous exact penalty functions to solve the constrained minimization problems with an integral approach. We examine a general form of the constrained deviation integral and its analytical properties. The optimality conditions of the penalized minimization problems are proven. To implement the al- gorithm, the cross-entropy method and the importance sampling are used based on the Monte-Carlo technique. Numerical tests show the effectiveness of the proposed algorithm.

Application of deviation rate in oil and gas reservoir exploration

Three dimensional geophysical models were abstracted and established according to characteristics of oil and gas reservoir.Then direct current fields for different models were simulated with finite element software(finite element program generator) by hole-to-surface resistivity method.Numerical solution was compared with analytical one for the homogeneity earth model.And a new parameter of deviation rate was proposed by analyzing different plot curves.The results show that the relative error of solution for homogeneity earth model may attain to 0.043%.And deviation rate decreases from 18% to 1% and its anomaly range becomes wide gradually when the depth of oil and gas reservoir increases from 200 to 1 500 m.If resistivity ratio of oil and gas reservoir to sur-rounding rock decreases from 100 to 10 for the resistive oil and gas reservoir,the amplitude attenuation of deviation rate nearly reaches 8%.When there exists stratum above oil and gas reservoir,and influence of resistive stratum may be eliminated or weakened and anomaly of oil and gas reservoir can be strengthened.

Freidlin-Wentzell’s Large Deviations for Stochastic Evolution Equations with Poisson Jumps

We establish a Freidlin-Wentzell’s large deviation principle for general stochastic evolution equations with Poisson jumps and small multiplicative noises by using weak convergence method.

An Efficient Frontier for Sum Deviation JIT Sequencing Problem in Mixed-model Systems via Apportionment

In this paper, the sum deviation just-in-time （JIT） sequencing problem in mixed-model production systems is studied relating with the discrete apportionment problem together with their respective mathematical formulations. The assignment formulation for the first problem is briefly discussed followed by the existence of JIT cyclic sequences. Presenting the concise discussion on divisor methods for the discrete apportionment problem, we have proposed two mean-based divisor functions for this problem claiming that they are better than the existing divisors; hence, we found a better bound for the JIT sequencing problem. The linkage of both the problems is characterized in terms of similar type of objective functions. The problems are shown equivalent via suitable transformations and similar properties. The joint approaches for the two problems are discussed in terms of global and local deviations proposing equitably efficient solution.

Modeling for Orientation Deviation of Workpiece and Analysis of Machining Accuracy

The machining accuracy of workpiece is influenced by its orientation deviation, which is caused by the fixture-workpiece error. Based on the spatial coordinate theory, the orientation deviation of workpiece is measured by using an on-machine verification system, which can take into account the errors resulting from fixture manufacturing, installation and adjustment, location and clamping of workpiece. According to the least square method, the model of orientation deviation is built to determine the relationship between the theoretical and actual coordinate systems. The influence of orientation deviation on machining accuracy is quantified, and it is shown that the orientation deviation only affects the dimensional precision and position precision, rather than shape precision. In the experiment, the compensation processing of realtime errors was conducted, and the perpendicularity and inclination errors of the tetragonal part were reduced by 38.46% and 47.06%, respectively.

基于SAR像素振幅离差法的建(构)筑物变化监测——以广州市白云区为例

利用遥感影像可以对建(构)筑物的变化进行快速监测,光学遥感影像精度较高,但人工核查工作量大,且易受到云雾等影响,在中国沿海地区难以实现连续快速动态监测。借助SAR影像全天时全天候的优势,本文利用振幅离差法对20110213和20120315两景覆盖广州市白云区的TerraSAR-X数据进行处理,并结合不稳定的像素点在建(构)筑物上的分布特征,提取研究区域内所有建(构)筑物变化区域,然后将振幅离差法提取的结果与光学影像提取的所有发生变化的建(构)筑物结果进行对比。结果表明,本文采用SAR像素振幅离差方法提取的变化建(构)筑物查全率为90.3%,工作量减少了83.6%,可实现建(构)筑物的快速高效监测。另外,本文也针对单一使用高分辨率SAR数据监测建(构)筑物的优势和不足进行了探讨。

基于Autoformer的铝电解电压偏差预测方法研究

电耗是吨铝成本中一项非常重要的生产指标,而电压偏差则是铝电解生产过程中电耗管理的关键点,因此本文基于中国铝业某铝厂2015—2020年的铝电解数据,对电压偏差的影响特征和预测展开研究。首先,利用分布式梯度增强库(eXtreme Gradient Boosting,XGBoost)算法深度挖掘电压偏差的关联性,并根据相关性得分选取与电压偏差相关性较大的特征。在此基础上,本文构建了基于Autoformer模型的电压偏差预测方法,对2020年前半年的电压偏差数据进行预测,取得了较好的预测效果。将电压偏差的预测结果应用于实际的电解铝生产指导中,可以实现电压偏差的预警,及时调整生产决策,从而减少能耗、稳定电解槽况、延长槽寿命。

基于SBFEM的剪切型裂纹动态开裂模拟

剪切型断裂是岩土工程中常见的破坏模式,了解剪切破坏机理并准确预测剪切型裂纹的萌生、扩展过程对保障工程结构的安全性与稳定性具有重要意义.文章建立了基于比例边界有限元法(scaled boundary finite element methods,SBFEM)和非局部宏-微观损伤模型的剪切型裂纹动态开裂模拟方法,定义了基于偏应变概念的物质点对的正伸长量,可作为预测剪切型裂纹扩展行为的动态开裂准则,一点的损伤定义为该点影响域范围内连接的物质键损伤的加权平均值,而物质键的损伤则与基于偏应变概念的物质点对的正伸长量相关联,并引入能量退化函数建立结构域几何拓扑损伤与能量损失之间的关系,将拓扑损伤与应力应变联系起来,通过能量退化函数修正了SBFEM的刚度系数矩阵,得到了子域在损伤状态下的刚度矩阵,推导了考虑结构损伤的SBFEM动力控制方程,采用Newmark隐式算法对控制方程进行时间离散.最后,通过3个典型算例验证了建议的模型可较好地模拟剪切型断裂问题,能够很好地捕捉剪切型裂纹的扩展路径,并得到较为准确的载荷-位移曲线.

采用云重心评判法的港口船舶溢油综合应急能力评价

为突破单环节评价港口船舶溢油应急能力的局限性,合理配置资源,采用云重心评判法全环节评估港口船舶溢油综合应急能力,面向应急准备、预警、行动、恢复全环节,参照人-机-环境-管理系统理论和国际国内规定,建立综合应急能力评价指标体系;针对传统评价指标因素未涉及模糊性和随机性的问题,用加权偏离度确定定性指标与定量数值间的转化关系;利用层次分析法(AHP)优化评价意见,弥补评价样本欠充分带来的精度缺陷;最后,以上海港为例,对船舶溢油综合应急能力评价作实证研究。结果表明:云重心评判法能合理评价港口船舶溢油综合应急能力,为健全和完备应急能力提供理论依据,为港口船舶溢油综合应急能力评价提供了一种新思路。

2024年1月23日乌什M_(S)7.1地震序列频谱偏移特征分析

采用P波初动方法计算了乌什M_(S)7.1地震序列中M_(S)≥4.0地震的震源机制解,震源机制解在时间上存在前期一致性较好,后期一致性紊乱的特点。空间上,乌什县内震源机制解类型多为逆冲型,阿合奇县内震源机制解类型多为走滑型。利用新疆地震台网数字波形资料和快速傅里叶变换方法,计算乌什M_(S)7.1地震序列中M_(S)≥5.0地震序列的频率谱,计算结果显示,乌什县内发生的5级余震前期有频谱偏移特征,最后一个5级地震频带变宽,频谱偏移特征消失;阿合奇县内发生的5级余震均出现了频谱偏移特征。

基于UWB偏差平均法和迭代算法吊物跟踪系统研究

吊运货物精准定位是智能仓储和安全管理的根本保障。本文采用UWB(超宽带)定位技术,按照车间构造合理布置信号基站,首先采用偏差平均平面定位算法,初步计算吊物坐标位置;然后用牛顿迭代法,将计算结构进行处理,提高货物定位精度;再利用MATLAB强大的运算能力,实现吊物路径跟踪,并采用数维图数据可视化工具(SovitChart)进行仓库管理平台的开发;最后,对综合算法进行试验验证,定位精度分析结果显示该方法合理有效。

铝箔纸进行建筑密封材料质量测试可行性分析

在当今建筑业中,密封材料的热失重特性测试是确保建筑性能和节能减排目标达成的关键环节。鉴于国家及国际标准对此类测试所规定的周期较长,围绕简化和加速热失重测试过程展开。通过深入分析GB 16776—2005标准下的热失重测试方法,并对比其他几种材料的测试手段,提出了一种便捷高效的检测方案,旨在为企业内部质量监控提供切实可行的技术支持。考虑到成本和实施的便利性,探索了使用铝箔纸代替传统金属环进行测试的可能性。铝箔纸的选用基于其660℃的高熔点和良好的化学稳定性——铝在空气中可迅速形成一层防护性氧化膜,此膜在高温下能有效阻隔化学反应,保证测试的准确性。此外,铝箔纸的低成本也大幅度降低了测试的经济负担。通过系列实验验证,不仅证明了铝箔纸在密封材料热失重测试中的可行性,还为其在实际应用中的推广提供了科学依据。

基于自助法的弧齿锥齿轮齿面修正

为了降低弧齿锥齿轮在批量加工制造中存在的齿面偏差,提出一种基于自助法的弧齿锥齿轮齿面修正方法。以同一批次小样本弧齿锥齿轮作为研究对象,在自助法统计齿面偏差检测数据的基础上,得到大量的齿面偏差数据;利用NURBS曲面拟合方法构建齿面的均值差曲面,将它作为实际加工齿面,建立齿面偏差的数字化预控补偿模型,对它进行优化求解,得到批量齿面数控加工的机床修正参数,然后不断调整机床加工参数,实现齿面的预控修正补偿;最后对修正前、后齿面偏差作对比分析。结果表明:小轮齿面偏差比修正前降低了76.66%,验证了自助法齿面修正理论的有效性,对指导弧齿锥齿轮批量齿面修正提供了理论依据。

基于“五脏偏倾”理论探析青少年特发性脊柱侧弯中医病机与治则

[目的]探析青少年特发性脊柱侧弯中医病机与治则,开拓其中医诊治思路。[方法]通过查阅中医古代文献中青少年特发性脊柱侧弯相关文献,基于《黄帝内经》“五脏偏倾”理论,通过文献研究总结青少年特发性脊柱侧弯中医病因、病机、治则治法,探讨中医“五脏偏倾”理论对AIS治疗与调摄的指导作用。[结果]文献研究发现,《黄帝内经》“五脏偏倾”表现与青少年特发性脊柱侧弯的病变部位、症状特征高度一致。基于中医“五脏偏倾”理论的学术内涵,青少年特发性脊柱侧弯症因以禀赋不足为主,饮食不节、劳倦所伤为诱,病机以脾肾失调、五脏偏倾为本,筋出槽、骨错缝为标,治则为调理脾肾、端正五脏、筋骨并重、内外结合,治法应综合内服、外治、导引、食疗等多种方法。[结论]青少年特发性脊柱侧弯与“五脏偏倾”高度相关。基于“五脏偏倾”理论探讨青少年特发性脊柱侧弯的病机与治则,可以为青少年特发性脊柱侧弯的“治未病”“既病防变”临床诊疗提供中医思路,值得重视与进一步挖掘并应用于临床。