安徽省区域物流中心选择的实证研究

区域物流中心的选择是一个热点问题,文章运用粗糙集方法对安徽省区域物流中心的选择进行了实证研究,并选取邮政业务量、交通运输仓储和邮政业基建投资、经济情况、交通条件四个因素作为评价标准,通过计算,最后得到的选择结果与安徽省区域物流中心城市的"十一五"规划布局基本一致.实证研究表明,用粗糙集方法选择区域物流中心,不失为一种有效的方法.     

Aircraft selection by applying AHP and TOPSIS in interval type-2 fuzzy sets

The selection of the appropriate aircraft can bring competitive advantages to airlines, however, there are a number of factors which introduce a degree of uncertainty to the selection process. By removing this uncertainty, airlines can increase their chances of achieving their long-term goals. New Multi-Criteria Decision Making (MCDM) methods provide decision-makers with a satisfactory solution for choosing suitable aircraft. Therefore, we focused on the multi-dimensional evaluation and selection of the most suitable commercial aircraft alternatives by using new MCDM method. This article provides decision support to airline planners on the selection of commercial aircraft under uncertainty. In the study, unlike other studies in the literature on aircraft selection, the model presented here uses an Interval Type-2 Fuzzy Analytical Hierarch Process (IT2FAHP) and Interval Type-2 Fuzzy Technique for Order Preference by Similarity to an Ideal Solution (IT2FTOPSIS) hybrid methods. The proposed model for aircraft selection allows commercial airlines to evaluate the aircraft in terms of specific criteria: economic performance, technical performance, and environmental impact, and, as a result, it helps decision makers select appropriate aircraft in an uncertain environment. In addition to use by commercial airlines, the methods in the study can also be applied to the selection of training aircraft, cargo aircraft and military aircraft. Our findings show that the Airbus A321neo is the most suitable commercial aircraft in terms of technical aspects, economic aspects and environmental aspects for airlines.     

基于CEEMD的小波软阈值和粗糙度惩罚平滑技术的联合信号去噪方法

为了有效去除采集信号中的噪声,基于MEMS水听器在采集信号时混入不同噪声的情况下,提出了一种基于CEEMD的小波软阈值和粗糙度惩罚平滑技术的联合信号去噪方法。CEEMD用于将一个含噪信号分解为几个固有模态(IMFS),然后把几个固有模态和原始信号作一个线性相关分析,分为相关性高的模态和相关性低的模态。将软阈值技术应用于相关性低的固有模态,并将粗糙度惩罚平滑技术应用于相关性高的固有模态,以提取尽可能多的信息,然后把处理后的新的固有模态重构形成去噪信号。分别在仿真和真实数据的基础上进行了实验,验证了方法的有效性。结果表明,联合信号去噪方法无论在去噪效果和性能指标上都优于基于CEEMD的小波软阈值的去噪方法和CEEMD的去噪方法,克服了经验模态方法和小波软阈值去噪的不足,为进一步分析与处理信号提供参考。     

Assembly information modelling and sequences generation algorithm of autobody

This paper attempts to formalise the assembly information of autobody and solve all feasible assembly sequences. In this paper, an assembly information model is built by using polychromatic sets and the mathematic forms of these models are given. The model is described by locating relation equations which express the constrained relationship of locating and displacement interference equations which express the constrained relationship of possible displacement. At first, the assembly information model is used to model the assembly information of autobody; then according to locating relation equations and displacement interference equations, all feasible assembly sequences can be derived. Finally, a case study illustrates the application of the proposed assembly information model. The proposed assembly information model and sequences generation approach is successfully demonstrated by autobody assembly planning, and could facilitate assembly sequence optimisation under a robust and reliable situation.     

Workflow process modelling and resource allocation based on polychromatic sets theory

In workflow management, studying the relationship between workflow process activities and resource allocation is one of the interesting research topics. Polychromatic sets theory (PST) is a relatively new mathematical theory which is especially suitable for treating such problems. Based on PST, this paper proposes a framework of workflow process modelling and resource allocation. As the theoretical foundation, polychromatic sets (PS), polychromatic graph (PG) and isolation operation (IO) of the PS are introduced. Special net structure (SNS), a special PG with colourless nodes and concolourous edges, is also introduced, and a new workflow process model and its verification algorithm are presented. Furthermore, a workflow resource model based on the entity of PS is developed. Based on IO of PS, the allocation mechanism that considers workflow process and workflow resource is proposed. Finally, a case study is provided to demonstrate the effectiveness of the above-mentioned theory and method.     

广西区域物流中心城市的选择研究

在分析广西经济和物流发展的基础上,应用粗糙集理论进行广西区域物流中心城市的比选,结果表明南宁和柳州可以作为广西区域物流中心城市重点发展。     

基于粗集的建筑企业竞争力模糊评价研究

在分析建筑企业竞争力评价方法现状的基础上,结合建筑企业特点,构建建筑企业竞争力评价指标体系,运用粗集理论对评价指标进行约简,利用德尔菲法和模糊综合评价法对指标的权重和评分进行计算,将郑州市七家建筑企业的竞争力状况进行分析比较,得出评价结果。研究表明,该方法可以有效评价建筑企业竞争力。     

FANUC数控系统车床G73功能参数选择

本文针对现在的教材和文章仅对G73指令格式进行阐述,未对指令功能参数进行详细讲解,参数选取方法不明确的问题进行分析,解决参数选取不当造成的首次空切或过切的问题,对学习者起到正确的指导作用。     

粗糙集应用于功能评价系数的确定

价值工程的功能评价系数已有多种传统确定方法,并应用于实践。但这些方法都反映了决策者对功能属性的主观判断。把粗糙集理论引入价值工程中,根据粗糙集理论的属性重要度来确定功能属性的权重,克服了传统方法确定权重的主观性,所得结果与传统方法相比,更为合理和更为客观。