电磁场数值模拟TLM算法及其应用

传输线矩阵（TLM）算法是基于Huygens的波传播模型，与计算机结合起来后，成为一种强有力的三维时域电磁场数值仿真算法，在1971年TLM被首次提出以后，便得到不断的改进，从二维到三维，从扩展型结点到凝缩型结点，从时域TLM到频域TLM，而其应用也从最初的处理电磁场问题发展到对微波电路的模拟，高速IC的设计，以及处理光学，机械学，热学和声学问题，本文详细介绍了二维、三维空间的TLM算法，扩展型结点和几种改进的对称凝缩结点，阐述了TLM在各领域的应用，最后还简单介绍了我们完成的工作。     

基于解释结构模型的铁路低碳物流影响因素分析

首先,介绍铁路低碳物流的内涵,通过SWOT分析,指出我国铁路发展低碳物流的必要性与迫切性,进而探究其影响因素。其次,采用解释结构模型,针对影响铁路低碳物流发展7个因素之间的关系,进行层次化分析处理,得出表层、中层和深层影响因素。最后,提出促进我国铁路低碳物流的发展对策。     

Determinants of board size in an emerging market

Drawing largely upon the selective adaptation paradigm, the resource dependence literature, and the capture argument, we examine determinants of board size using panel data set of Korean‐listed companies that have experienced dramatic changes in their governance system following the 1997 Asian crisis and regulatory reforms. Observing that the firm's compliance with statutory requirements reflects a strategic choice, our results also investigate the idea that the determinants of board size differ between firms actively and passively adapting to regulatory reforms. For actively adaptive firms, board size increases along with firm complexity but it varies inversely with the power of controlling shareholders (CSHs). In contrast, the roles of complexity and CSHs are not significant but seniority‐based promotion is an important factor to increase the size for the passive firms. Our results suggest that determinants of board size differ depending on corporate strategies to comply with statutory requirements in an emerging market where family business is dominant and corporate governance system has substantially changed.     

经验模态分解在切削振动信号分析中的应用

为了分析切削振动的变化规律及产生根源,采用在线监测的方法采集振动信号,提出了运用经验模态分解对振动信号进行分析的方法,构建了分段频率变化的仿真振动信号,分别对仿真振动信号进行短时傅里叶变换、小波变换和经验模态分解时频分析。结果表明,经验模态分解方法具有更高的时频分辨率,运用经验模态分解方法对实际振动信号进行分析,提取典型分量绘制希尔伯特幅值谱,能较好地反映振动信号的时频变化规律。经验模态分解适合对切削振动信号进行分析,但是需要对算法的模态混叠及计算效率低等不足进行完善。研究结果对非平稳信号的分析具有参考价值。     

身份差别与收入差距：基于分位数回归的实证研究

基于均值分析的经典OLS回归掩盖了身份变量对于不同收入点的作用大小和显著性,本研究引入分位数回归,重点分析身份差别对于收入分布的影响及影响的规律性。利用2013年家庭住户收入调查（CHIP）数据,研究发现：①户籍身份对收入的条件分布具有呈"U"形的显著影响。②党员身份对中高端收入人群具有扩大收入差距的效应。③就业身份的影响差异明显,固定职工、长期合同人员相对于临时合同、没有合同人员在收入分布的中高端具有显著且更大的影响;在任一收入分位数水平上,固定职工、长期合同、临时或短期合同、没有合同的收入回报依次降低。     

The cultural tourism potential of a fashion-related exhibition – the case of Alexander McQueen: Savage Beauty at the Victoria and Albert Museum

The exhibition Alexander McQueen: Savage Beauty held at the Victoria & Albert Museum (V&A) in London attracted a total number of 493,043 visitors from both the UK and overseas, making it one of the most visited exhibitions throughout the museum’s history. Much of the exhibition’s popularity was drawn from the late designer’s fame, reputation, and exceptional technique in design and clothing construction. The V&A museum also having the title as the greatest Museum of decorative arts and design, and founded during the late Victorian era, possesses heritage value that may also have played a role in attracting visitors to the Savage Beauty exhibition. Findings suggest that Savage Beauty appeals more on the local cultural tourism context for its connection to London. The V&A’s heritage value as Grade I listed may be of minimal interest to tourists; however, visitor interest in London and the number of great museums in the city serves well enough to attract and enrich cultural awareness of potential tourists both local and international. Special exhibitions such as Savage Beauty may also prove effective in attracting tourists, leading to increasing cultural tourism once tourists learn more about London’s culture, which includes fashion, but only in a derivative sense.     

End-of-life aircraft treatment in the context of sustainable development,lean management,and global business

Dealing with retired aircraft taking into account the environmental, social, and economic impacts is emerging as an air transportation problem for the near future. The players involved in the problem wish to solve this challenge in a systematic way to benefit from the value extracted from the core activities of the end-of-life (EoL) aircraft treatment, decrease the environmental impacts, and at the same time maximize the social value. This paper proposes a holistic approach to EoL aircraft treatment considering lean management, sustainable development, and the global business environment. An integrated optimization framework is proposed to support decision-making at both the strategic and managerial levels. The flexibility of the framework makes it possible to compare different business models, dismantling strategies, and network structures that impact the efficiency, stability, and leanness of the recovery network. A solution methodology based on the joint application of fuzzy interactive approach and genetic algorithm is introduced. The application perspective and guidelines for pilot study are also provided. To the best of our knowledge, this is the first time that recovery of EoL aircraft is considered based on three aspects of sustainability, lean, and global business. Therefore, this study provides many promising perspectives in this context to enrich the literature of EoL aircraft as a new aviation industry challenge and opportunity.     

论现代企业财务风险及其预警

财务风险是威胁企业生存的重要因素之一。研究财务风险及其预警具有非常重要的理论和现实意义,国内外学者做了很多有益探索。本文在总结这些探索基础上,提出经济附加值(EVA)预警模型,以期对企业财务风险预警有一定指导作用。     

在企业信息化中BPR与IT的双向驱动作用

从阐明企业信息化建设和业务流程重组(BPR)的关系入手,分析了企业信息化建设中业务流程重组(BPR)与信息技术(IT)的双向驱动作用。     

高效液相色谱法测定熏烧烤肉制品中苯并(a)芘的不确定度评定

本文按照《食品安全国家标准食品中苯并(a)芘的测定》(GB 5009.27—2016)检测熏烧烤肉制品中苯并(a)芘的含量,并参照《测量不确定度评定与表示》(JJF 1059.1—2012),建立测量模型,对实验结果的不确定度来源进行分析和评定。结果显示,熏烧烤肉制品中苯并(a)芘含量为2.708μg·kg-1时,其扩展不确定度为0.215μg·kg-1(k=2),标准曲线拟合过程引入的不确定度最大,其次为重复性测定,需要在以后实验中保证规范操作,以减小不确定度,保证检验结果准确可靠。