Assessing the role of network topology in transportation network resilience

The abstract representation of a transportation system as a network of nodes and interconnecting links, whether that system involves roadways, railways, sea links, airspace, or intermodal combinations, defines a network topology. Among the most common in the context of transportation systems are the grid, ring, hub-and-spoke, complete, scale-free and small-world networks. This paper investigates the role of network topology, and the topology’s characteristics, in a transportation system’s ability to cope with disaster. Specifically, the paper hypothesizes that the topological attributes of a transportation system significantly affect its resilience to disaster events. Resilience accounts for not only the innate ability of the system to absorb externally induced changes, but also cost-effective and efficient, adaptive actions that can be taken to preserve or restore performance post-event. Comprehensive and systematically designed numerical experiments were conducted on 17 network structures with some relation to transportation system layout. Resilience of these network structures in terms of throughput, connectivity or compactness was quantified. Resilience is considered with and without the benefits of preparedness and recovery actions. The impact of component-level damage on system resilience is also investigated. A comprehensive, systematic analysis of results from these experiments provides a basis for the characterization of highly resilient network topologies and conversely identification of network attributes that might lead to poorly performing systems.     

振动应力筛选

本文介绍了振动应力筛选技术,讨论了建立振动应力筛选的益处,应考虑的主要问题以及应牢记的关键因素。     

大学英语课程测试与试卷分析

课程测试是考核学生学习效果和检查教师教学效果的重要方式与途径。本文通过对《大学英语》这一课程的试卷和检测结果进行分析和讨论，以求对《大学英语》课程进行客观、准确、公正的测试，以便提高大学英语教学质量。     

What makes a good case study? A positivist review of qualitative case research published in Industrial Marketing Management, 1971-2006

Business-to-business marketing research has a long tradition of using qualitative case studies. Industrial Marketing Management (IMM) has actively encouraged the use of case methods, resulting in many important theoretical advances in the field. However, debate still rages over what constitutes “good case research”. This article addresses this issue from a positivist standpoint. We examine the how authors address issues of quality in the 105 qualitative case studies published in IMM between 1971 and 2006. Four periods were identified: 1971-1979, 1980-1989, 1990-1999, and 2000-2006. Findings demonstrate that, from a positivist viewpoint, there has been a steady improvement in how authors addressed issues of research quality in published qualitative case studies. Suggestions for changes in data presentation, reviewer expectations, the IMM reviewer feedback form, and the use of web-based appendices containing data pertinent to reader judgments of research quality are suggested.     

浅谈电子设备中软件可靠性与稳定性的检验

本文结合某电子设备中一个软件故障的发现、验证和排除过程，就如何对电子设备中软件可靠性与稳定性的检验进行了一定的探讨。     

裸芯片组装微电路失效机理的研究

本文总结了几年来我们制作的微电路发生失效的情况,对失效的机理进行了分析并研究相应的可靠性保障技术,逐步形成二次集成微电路小批量投产的质量控制体系,从而使产品的成品率与可靠性有了明显的长足进步.提供的产品满足了整机的技术要求促进整机在小型化和高可靠性方面上一级新台阶.     

On the discrete mean past lifetime

Let T denote a positive discrete survival time and n a non-negative integer number. Properties of the mean past lifetime E(n  −  T|T  <  n) are provided. M. Asadi’s work is supported by the University of Isfahan Grant 850713.     

The value relevance and reliability of reported goodwill and identifiable intangible assets

We examine the value relevance and reliability of reported goodwill and identifiable intangible assets under Australian GAAP from 1994 to 2003; a period characterised by relatively restrictive accounting treatment for goodwill and relatively flexible accounting treatment for identifiable intangible assets. Our findings, using an adaptation of Feltham and Ohlson (1995), suggest that for the average Australian company the information presented with respect to both goodwill and identifiable intangible assets is value relevant but not reliable. In particular, goodwill tends to be reported conservatively while identifiable intangible assets are reported aggressively.     

电子产品研制过程的可靠性管理

为建立闭环式可靠性管理,本文从如何确定可靠性参数和指标开始,对如何进行可靠性预计、如何确定定时截尾可靠性鉴定试验方案{T,C}和开展软件可靠性定量评估等方面进行了讨论。     

提高油田开发质量可靠性水平之我见

针对油田开发系统质量可靠性发展不平衡、质量体系运行有效性不高的实际，特别是针对油田开发的核心单元－油藏工程分系统质量可靠性工作的现状，提出了提高油田开发质量可靠性水平的具体措施。