基于MSP430的低功耗水中低频信号采集系统

为了采集水中低频信号,提出基于MSP430F1611单片机和Flash存储器的水中低频信号数据采集与存储系统,实现了水中目标测量中的低噪声、低功耗、智能自动记录和大容量存储等关键技术,海上试验结果表明该系统精度高、性能可靠。     

海事信息安全关键技术研究

因全国海事系统的计算机都通过网络联系到一起,信息安全的内涵也就发生了根本的变化。它不仅从一般性的防卫变成了一种非常普通的防范,而且还从一种专门的领域变成了无处不在。当步入21世纪这一信息社会、网络社会的时候,建立起一套完整的海事信息安全体系也成为当务之急。     

网络化SCADA系统调度端设计及可靠性分析

提出了一种高性能网络化ＳＣＡＤＡ系统调度端的设计方案，给出了其硬件结构图及网络软件设计框图，并建模分析了系统可靠性，该设计方案已成功地应用了于京郑线及湘黔线ＳＣＡＤＡ系统。     

装备监测实验室仪器设备网络化管理系统研究

针对目前装备监测诊断实验室仪器设备的布置比较分散，分析数据需要二次人工录入并且实验室中已有网络利用率不高等实际情况，研究开发了实验室监测仪器设备网络化管理系统。文章主要介绍了该系统的硬件联网方案、网络化数据采集的实现和软件的总体设计。     

Empirical approaches to combining revealed and stated preference data: Some recent developments with reference to urban mode choice

This paper replaces the nested logit ‘trick’ used in estimation of a modal choice model, when stated preference (SP) and revealed preference (RP) data are pooled, with an error component mixed logit model that can (i) relax the IID condition attached to subsets of alternatives in nested logit models, (ii) accommodate correlated observations, and (iii) reveal the relevant scale parameter for subsets of alternatives. Such a model can also incorporate state dependence between data types and preference heterogeneity on observed attributes. An example of choice among bus, train and car modes illustrates the difference in empirical evidence, especially elasticity outputs.     

缸内直喷的丰田卡罗拉1.2T怠速不稳解析

一辆2020款丰田卡罗拉1.2T汽车,行驶里程为1000KM,出现怠速不稳甚至熄火,经过专用诊断仪测试,汽车的高压燃油压力最高为16MPA,小于正常的20PMA,而且高压压力值随着怠速时间延长逐渐下降,甚至达到0.2MPA,启动时不容易着车,反复启动着车正常,高压压力无规律波动,更换高压油泵故障仍出现,高压油泵属于日本两个汽车配件厂生产,此故障曾在同类车型出现,丰田制造厂已经启动调研程序。     

The future of road safety: A worldwide perspective

Estimates by the World Health Organization suggest that, on a yearly basis, road crashes kill 1.25 million people—nearly 3400 road fatalities per day—and injure up to 50 million. Traffic injuries are not equally spread over the world, however; some countries are hit harder than others, and the chance of being killed in a road crash depends on where one lives. Almost 90% of all traffic casualties occur in low- and middle-income countries (LMIC). Globally, the number of fatalities per 100,000 population (mortality rate) ranges from less than 3 to almost 40. The rate is less than 9 in high-income countries (HIC) but averages around 20 in LMIC, with the African region demonstrating the highest rate (26.6). While road safety trends have been positive in HIC over the last few decades, trends in LMIC are not telling a positive story: road fatalities are expected to increase to almost 2 million road fatalities per year by 2020.The United Nations has adopted several resolutions on road safety and proposes actions to tackle the global road safety crisis. Considering the current level of road safety to be unacceptable, the UN has taken several initiatives. One effort, the Decade of Action for Road Safety 2011–2020, has generated substantial activity around the world over the last couple of years. Furthermore, it is very encouraging that the UN included road safety in the Sustainable Development Goals that it laid out in September 2015. Road safety is part of the public health agenda and the urban development agenda. Measured in “real actions,” however, the responses so far from the overall global community and individual countries do not suggest that we are already on the right track to bringing down the death toll on roads.The future of road safety is uncertain and definitely not the same for all regions of the world. Countries with a mature road safety approach and an ambition to make further progress are expected to move in the direction of a pro-active approach: a Safe System approach. It is reported that many LMIC, meanwhile, are on the brink of designing road safety strategies and implementing action plans. The international community is willing to support LMIC, but LMIC cannot simply copy successful HIC strategies because local circumstances differ. The principles of successful HIC strategies are applicable, but the priorities and action plans should take root in and align with local conditions.     

基于Java语言的安全性分析

在网络应用中发挥着重要作用的Java是一种优秀的编程语言.Java的目标是为了满足在不同操作系统平台的网络开发软件,适合于分布式计算环境的面向对象编程语言,其安全性能显得尤其重要.现从网络应用、语言机制、运行环境3方面入手,分析比较Java和C 的安全规范,从而使我们能认识到Java在安全机制上的优势.     

面向对象收费系统的数据安全与解决方案

一种利用计算机仿真技术整合多种库类型格式的创新方案，采用虚拟磁带库保护数据安全，保证了面向对象系统的数据存储更高性能与智能化．并已在面向对象技术的不停车收费系统中得到了成功应用。     

嵌入式船舶数据记录仪监测系统设计与实现

以PC/104嵌入式工控机与PC机所组成的局域网为基础,在VC环境下,有效利用CSocket类和SQL数据库,开发基于TCP/IP协议、客户端/服务器模式的专门记录船舶装置长期运行且无人值守环境下的监测系统,完整、准确地记录船舶航行各装置工况。系统具有实时数据采集、远程数据传输、数据监测、数据查询等功能,并在文件传输过程中采用混沌加密算法保证数据信息安全。经过实际调试与运行,该记录仪运行稳定,实时性好,安全性高。