Coastal Erosion and Its Social and Environmental Aspects in Tanzania: A Case Study in Illegal Sand Mining

Coastal erosion is one of the major coastal problems currently facing Tanzania. Several factors, including sea level rise, geology, and rapid coastal population growth accompanied by rapid increase of human activities that interfere with natural processes, have been linked to the problem. One of the human activities that have been well linked to the problem of coastal erosion is illegal sand mining along beaches, coastal streams/rivers, and other restricted areas. This causes localized accelerated/ severe coastal erosion and enormous environmental degradation and threat to coastal properties. Illegal sand mining is presently a big industry in Tanzania, employing many youths, and has become a social, economical, and environmental problem. Thus, it is a sensitive issue. The problem of illegal sand mining in Tanzania is revisited, and possible measures to control it are proposed. Measures that can help to reduce/eliminate illegal sand mining are: governments to address effectively the problem of unemployment and poverty in the society by formulation of effective policies, including the total liberalization of the labor market and reduction of the tax burden and regulations on potential employers; identifying alternative sources of sand that are environmentally safe to mine, of good quality, and easily accessible; launching well-focused mass education on the problem of coastal erosion; encouraging formation of legally registered associations of sand-miners that will work closely with relevant authorities to curb illegal sand mining; and strengthening of governance and improving research funding in the country.     

浅谈数据库数据备份及数据高可用性

数据库保存了行调指挥中心的所有基础数据、实时数据等内容,如何保持其安全性、稳定性、持续性是一个重要问题.为此,对数据库数据备份及数据高可用性提出解决方案.     

计算机口令设置的要求与技巧

我们已进入信息化社会,很多人都需要利用计算机处理每天的学习和工作,当我们在网上使用一些如邮箱、聊天、网上银行等功能时,需要设置口令来保护自己的信息,本文介绍了黑客攻击用户帐户的常用方法,用户设置口令的要求与技巧。     

Measuring supply chain efficiency based on a hybrid approach

Supply chain management has a tremendous impact on the success of a company. One of the critical issues for gaining competitive advantages for companies is improving supply chain performance. Most studies about the application of Data Envelopment Analysis (DEA) Supply chain models do not identify the benchmarking units for inefficient supply chains. On the other, measuring the short run and long run of the supply chain efficiency is another challenge for decision makers in supply chain management. Hence, we propose a methodology of DEA for measuring of the supply chain. We integrated two approaches as special cases of the hybrid model and compare the short and long run strategies of supply chain and can be identified benchmarking.     

Cost-efficiency benchmarking of European air navigation service providers

This study uses EUROCONTROL data on operating performance of the national air navigation service providers over the 2002–2011 time period to document in detail the efficiency changes across providers and time using data envelopment analysis. Our results suggest that overall providers’ productivity improved over the time period covered by the data, driven by improvements in technical rather than allocative efficiency. However, some trend reversals in the post-2008 crisis period are also observed.     

上海市道路货运结构的经济适应性评价

分析上海市道路货运结构与国民经济的适应性。采用DEA数据包络分析方法,通过选取国民经济指标及道路货运结构指标,评价上海市道路投入及经济产出的有效性,进而说明上海市现状的道路货运结构与国民经济的适应性。最后,通过模型结果分析上海市道路货运结构中存在的问题,并为道路货运结构的调整提供合理性建议。     

The influence of the road network on private productivity measures using Data Envelopment Analysis: A case study from Spain

We evaluate the economic effects of investment in the road network on private regional activity. We employ provincial Spanish panel data from 1980 to 2007 to perform non-parametric frontier techniques based on Data Envelopment Analysis and to obtain the Malmquist productivity indexes, thus enabling us to examine the evaluation of the productivity growth via technological changes or efficiency gains. Additionally, we analyze the role of transport infrastructure on the evolution of Total Factor Productivity and its components through econometric techniques. Our results show important spillover effects. Moreover, our findings have significant implications for policy makers if we take into account the fact that the use of the road network in economic activity or in commercial relations greatly influences productivity growth.     

PSC数据中船龄与缺陷相关性的可视化挖掘

基于台湾某四港近8年来PSC工作的电子数据记录,对船舶缺陷与船龄进行关联分析,提取其间相关特征,提出一套行之有效的可视化数据挖掘方法,为提高港口国检查工作效率提供了一个科学、高效的定量方法。     

基于PCI/CPCI接口的1553B总线模块设计与实现

在概述PCI/CPCI总线的发展、特点及应用的基础上,详细介绍基于PCI/CPCI接口的1553B总线模块的设计方法及其关键技术。     

XML技术在CTCS-3级仿真测试管理中的应用

仿真测试管理器是CTCS-3级仿真测试平台的重要组成部分.将XML技术应用于仿真测试管理器,实现其各仿真测试节点初始化设置、网络参数配置和信息记录3个功能,促进了仿真测试管理器的开发,优化了CTCS-3级的仿真测试过程.