The determinants of maritime policy

The paper is to explore the relation between national economic development and the formulation of maritime policy. It collects and examines data from 30 maritime nations, and shows that maritime policy is determined by economic circumstance rather than the result of rational decision of policy makers. A general solution is produced for an optimum maritime policy under a given economic condition. The general solution can serve as a benchmark for future maritime policy making and research in general.     

Evaluating competitiveness using fuzzy analytic hierarchy process—A case study of Chinese airlines

With the development of a national market economy, the Chinese aviation industry is now confronted with international competition. Therefore, it is necessary to research the competitive status of Chinese national aviation, as well as advice on how to enhance the competitiveness of the Chinese aviation industry. The main objective of this paper is to propose FAHP as an effective solution for resolving the uncertainty and imprecision in the evaluation of airlines' competitiveness. In this paper, we review the research of industrial international aviation competitiveness at both home and abroad, discuss a theoretical framework for the study of aviation competitiveness, establish an index system with five first‐order indicators and 17 second‐order indicators, set up a Chinese aviation competitiveness model based on simple fuzzy numbers from the fuzzy analytic hierarchy process, and evaluate the competitiveness of five major Chinese airlines. The results showed that this model and these indicators are scientific and practical, with a wide range of application prospects for the purpose of improving and increasing Chinese airline competitiveness in the international market. The effective approach presented in this paper is especially applicable when subjective judgments on performance ratings and attribute weights are not accessible or reliable, or when suitable decision makers are not available. Copyright © 2011 John Wiley & Sons, Ltd.     

郁江大桥航道试爆振动测试初步分析

为防止爆破地震动导致桥梁结构的损坏,需要对航道爆破区地震动效应进行研究,确定爆破安全距离及安全装药量。文章通过对郁江大桥试爆结果进行分析,为本工程及类似工程进入施工阶段时的爆破设计提供参考数据。     

基于重力匹配导航的潜艇避障方法分析

介绍重力匹配导航的基本原理,根据匹配导航的基本流程对潜艇遇到障碍物的航线进行最优分析.在匹配中要对重力仪所测得的重力异常值进行厄特缶斯改正,其中速度误差是厄特缶斯改正主要误差源,改正后对重力异常值进行分析,根据重力的异常分析,推测障碍物与潜艇航迹之间的相对位置关系,从而对惯导系统的导航状态进行修正,得到最优导航状态.     

主冷却剂流量连续变化调节反应堆功率可行性研究

通过建立主冷却剂流量连续变化调节反应堆功率仿真模型,引入二回路负荷变化,对核反应堆热工水力瞬态过程进行分析研究,并与控制棒调节功率方案进行对比。结果表明:在低功率运行工况下,通过连续改变主冷却剂流量能够实现反应堆功率的调节,并满足反应堆热工安全性和机动性的要求。     

Adoption of Internet Services in Liner Shipping: An Empirical Study of Shippers in Taiwan

Abstract

The Internet service attributes desired by shippers were examined as well as a model that seeks to explain the intention of shippers to use Internet services in liner shipping. Using data collected from a survey of a group of shippers in Taiwan, the relationships among the constructs in the model were tested, namely: perceived usefulness, perceived ease of use, security and use intention. The results suggest that shippers perceive tracing to be the most important service attribute of Internet services, followed by checking for customs clearance, vessel schedules and electronic document services. The findings indicate that perceived ease of use is the major factor affecting the intention of shippers to use Internet services, and that perceived ease of use has a strong positive effect on perceived usefulness. The results also indicate that security has a positive effect on a shipper’s perception of ease of use. However, the influence of security on use intention and perceived usefulness was not supported in this study. The theoretical and practical implications of the findings on the intention of shippers to use Internet services in liner shipping are discussed.     

固定闭塞下具有容错性质的车次追踪模型

本文在对调度集中系统车次追踪问题进行分析的基础上,以提高车次号的准确性为目标,结合有限自动机理论,利用抖动抑制算法降低车站信号状态可能出现的抖动干扰,提出了一种基于车站简单对象并具有容错性质的车次追踪模型,并对模型的运行机制进行了论述.该模型已在实际系统中得到了应用,并取得了良好的效果.     

高填路堤沉降有限元解法

通过用有限单元法对一高填路堤典型断面的计算,并将所得沉降值与实测数据进行对比分析,得出：用D—P模型结合有限元分析软件计算地基沉降是可行的。     

汽车动力转向系统匹配性能分析

分析了汽车动力转向系统主要部件匹配试验与台架试验相互间的关系和差异,揭示了产生这些差异的原因,为动力转向系统的匹配试验研究和匹配评价提供了依据.