直觉梯形模糊几何集成算子及其在群决策中的应用

文章首先定义了直觉梯形模糊数及其运算法则,基于这些运算法则,给出了直觉梯形模糊几何集成算子,即直觉梯形模糊加权几何(IT-WG)算子、直觉梯形模糊有序加权几何(IT-OWG)算子以及直觉梯形模糊混合几何(IT-HG)算子。在此基础上,提出了在属性权重已知的情形下专家评价值以直觉梯形模糊信息给出的多属性群决策方法。最后以产品最优设计方案的选择为实例进行分析,所得结果验证了该方法的有效性。     

平方余数序列扩散体于声屏障的应用

传统屏顶吸声体采用的棉状吸声物料存在着比重高,防水性能差,降噪能力不理想等缺点。平方余数序列扩散体基于共振原理消声,不但大大改善了以上传统屏顶吸声体的缺点,更可以通过设计,为指定的音频范围降噪。本文将介绍二款(T型及六角型)专门为减低交通噪声而研发的屏顶平方余数序列扩散体,它们的有效降噪范围从400Hz到2500Hz。T型及六角型扩散体的初步测试结果显示在低中频的插入损失有6至7.5分贝。     

Grey Critical Chain project scheduling technique and its application

Based on the idea of Grey System and interval number coefficient notation, a Grey Critical Chain scheduling approach is studied. According to Grey system Theory, the time of project or task completion can be considered as the object that extension is definite but intension is uncertain, which is coincident with the character of the project management. The Grey Critical Chain Scheduling Technique mainly aims at the single project time management, but the management idea can also be applied to the other knowledge areas of the project management. In this technique, we improve the selection method of the buffer time in the Critical Chain, in order to obtain reasonable Feeding Buffer time and Project Buffer time. In this paper, we will use an example to discuss the Grey Critical Chain Scheduling Technique, compare Grey Critical Chain with Program Evaluation and Review Technique, Critical Chain and Fuzzy Critical Chain, and analyze the advantages, disadvantages and applicable scope of their own.     

基于GERT网络改进算法的某型船舶制造周期问题研究

针对船舶制造周期的估计和控制问题,将灰色系统中的区间灰数引入到GERT网络的求解过程,采用经过改进后的标准区间灰数对网络流参数进行改进,从而得到项目周期的改进计算,以巴拿马型散货船的制造过程为例对船舶制造的成功概率与完成时间问题进行研究,展示了其在船舶订货周期控制中的实用性和适用性。     

拆分招标的供应商数量研究

许多企业在采购时,常常将整笔业务拆分为两个合同:较大的第一合同和较小的第二合同,通过分批二级价格封闭式招标来选择不同的供应商供货。本文通过建立分批招标模型分析了供应商的投标策略和买方的采购策略,得出了当参加第一合同竞标的供应商数目和第二合同新引入的供应商数目满足一个不等式时,拆分招标的采购成本小于整体招标的采购成本,并且指出了拆分比例对拆分招标的采购成本的影响。     

Entry and the Number of Firms in the Swedish Pharmaceuticals Market

This paper analyses the factors that determineentry into the Swedish pharmaceuticals market. The analysis is based onpanel data for 22 different substances covering the years 1972 to 1996. Theresults show that profit opportunities in a particular market have apositive impact on entry. In addition, there is some evidence suggestingthat the length of the patent protection period has a negative impact onentry.     

基于模糊层次分析法的企业人力资源风险因素评价

文章结合三角模糊数和层次分析法,以企业外部环境、内部环境及人力资源个人3个方面的11个因素为指标体系,建立模糊层次分析模型,采用三角模糊数表示专家的判断信息,加权平均综合多名专家意见,利用层次分析法对专家判断结果进行处理从而得出各个评价因素的相对权重的大小,并举例说明了模型的应用。     

国际工程承包项目失败因素的三角模糊数分析

本文分析了影响国际承包项目失败的因素并建立了相应的指标评价体系,介绍了运用三角模糊数互反判断矩阵[3]确定因素权重的方法。结合实例描述了此方法在确定国际承包项目失败因素权重上的应用,进而明确主要失败原因,不断认识项目在承包过程中出现的问题,使我国建筑企业在国际承包领域不断进步。     

所得税申报中资产时间性差异的调整方法比较

在所得税申报中,资产时间性差异的纳税调整要涉及几个纳税年度,并且一个正常生产经营企业的资产往往处在动态过程中。每年有新增资产,也有出售、报废、到期的资产,要准确无误地对其进行纳税调整,是所得税申报中的一个常见问题也是难点问题。文章通过对所得税申报中资产时间性差异调整的两种方法的比较,确定一种较为简便可行的方法。     

Query Titles in Travel Forums: Nature and Impacts on Responses

Despite travel forums being an influential source of electronic word of mouth in the tourism context, the nature of interaction between information inquirers and contributors is yet to be appraised. This study attempts to fill the knowledge gap by exploring the inquiry titles in a travel forum in terms of its nature and influence on viewers’ responses. For empirical examination, thread titles for queries on South Korea and Japan that were posted in the Lonely Planet Thorn tree forum between March 2009 and February 2010 were collected (n?=?220) and analyzed. The results reveal that search by location is prevalent when potential tourists post a query in a travel forum. Search by interest is more likely at the city or regional level, while search by general (SBG) topic is prevalent in national-level search. The nature of inquiry title also reflects the intended length of stay at a destination. SBG in title significantly outweighs other categories in terms of the number of views and replies. Implication of findings and directions for future study are discussed.