数据容灾技术综述

云计算是一种新型的计算模式,为容灾提供了一种有吸引力的实现方法。本文首先介绍了传统的容灾模型,分别从基于外存储器容灾和。基于内存储器容灾两个方面进行研究,给出了这些技术的优、缺点。然后介绍了云计算的思想,最后提出了基于云计算的容灾机制。     

核心网络设备容灾方案的探讨

本文主要基于Iu/A-Flex、IP承载技术以及传统的备份方式,讨论了现代移动通信网络的通用容灾方案,为通信网络安全提供了一种可选的通用容灾模式。     

地级市人力资源和社会保障信息系统同城异地高可用性容灾备份平台建设方案选择

结合地级市同城容灾备份中心的特点，提出了高可用性容灾备份系统的建设目标，分析了当前各类计算机信息系统容灾技术，提出了综合性的解决方案。     

基于ORCLE中间件的高校数据容灾解决方案

数据容灾是高校数据高可用的最后一道防线，其目的是为了系统数据崩溃时能够快速的恢复数据。因此，要根据学校信息化安全建设的规划，建立一个支持全校数据存储与备份的异地数据容灾备份系统，为学校的关键信息提供安全可靠的备份保护。本文详细分析Oracle的GoldenGate产品在高校数据容灾中的可行性，针对高校的应用环境与实际情况，设计了一套基于GoldenGate的应用级容灾系统，并针对各种异常提出了相应的处理办法。     

浅谈LTE FDD与CDMA室内分布系统混合组网建设方案

本文主要介绍CDMA网络室内分布系统的现状,从工程建设角度探讨2.1G频段LTE FDD与800M频段CDMA室内分布系统混合组网建设方案.     

混沌扩谱CDMA的系统模型及其性能分析

混沌序列在具有很好随机性的同时,一些序列还具有KroneckerDelta自相关和近似正交的互相关特点,因此被认为是实现直序扩谱CDMA系统较理想的扩谱序列之一,成为近年来研究的热点。文中从异步DS-CDMA系统的模型入手,分析影响CDMA系统性能的关键问题,说明混沌扩谱CDMA系统的性能优点。为了实现混沌扩谱CDMA系统的数值仿真与性能验证,以切比雪夫映射产生的混沌序列为例进行混沌扩谱CDMA系统的性能分析,并与基于Gold和Kasami两种序列的传统DS-CDMA系统进行比较。     

牵引变电所一种新型站控备自投的研究

本文基于牵引变电所备自投功能原理,分析发现目前牵引变电所的两种主要备自投方式的不足,提出了新的解决办法,综合自动化系统一种新型备自投实现方案一站控层备自投,并对站控层备自投实现方式进行了探讨。     

基于数据容灾技术在企业信息系统中的应用研究

随着科技的进步,数据容灾技术迅速发展,为各行各业提供技术保障。企业的经济实力不断增强,在信息存储、管理及备份等方面的程序也越来越复杂,如何能够安全地保护企业信息系统,成为各企业关心的问题。建立一套完整的数据容灾方案并实施数据容灾技术,能够有效地提升企业信息系统的安全性,保证信息管理连续性能。文章研究数据容灾技术的基本概念,并对其在企业信息系统中的应用进行概述。     

基于多元统计分析的水灾损失等级评估

基于多元统计分析理论的主成分分析和判别分析于灾害损失等级划分的研究，建立了一种水灾灾。度等级划分的综合评价模型，实证分析的结果表明：这是一种稳定性较好且切实有效的综合评价方法模型。     

多级数据容灾系统的设计与实现

近年来,新闻媒体大力推广数据集中管理模式。但在该模式又给各家媒体带来了因为非人为或人为因素导致的数据安全问题。众所周知,解决数据安全问题现行的最好方法,便是建立完善的数据容灾系统。在此,笔者通过对多家媒体的数据容灾系统的调研与分析,提出不同的解决方案。     

TDD/CDMA移动通信系统的一种信道分配方案

未来的TD/CDMA移动通信系统中存活话音及上下行业务量不等、优先级不同的数据业务，为适应新业务的特点，充分发挥TDD/CDMA移动通信系统自身的优势，本文提出了TDD/CDMA移动通信的一种新的信道分配方案。仿真结果表明，该方案可大大降低低优先级业务的掉线概率，充分利用有限的信道资源。     

Social inequalities in injury risk in Wales,U.K.

Road traffic accident data in Nigeria generally lack exact coordinate information. Accident analysis is, therefore, restricted to aggregate data on trends, magnitude and temporal dimensions. This article addresses the road accident problem in Jos between 1995 and 1999 through a road profiling approach. Results show that four gateway routes, seven multilane roadways (including two gateway routes) and seven road intersections accounted for 84% of all traffic accidents, 84% of injured casualties and 88% of fatalities. This approach allows for quantification of impacts of controlling for accidents by deliberate profiling of roads for close monitoring and policing. For example, reducing accident counts and fatalities by 50% each on gateway routes will amount to ～35 and 40% reduction in accident and fatality counts, respectively. Countermeasures must consider these roadways and intersections as important inputs in their accidents and casualty reduction targets.     

一种基于CDMA/TDMA混合多址的GSM与CDMA扩容方法

提出了一种基于CDMA/TDMA混合多址的GSM与CDMA扩容方法。在发送端,通过扩频码对GSM信号进行直接序列扩频,使其多址方式由TDMA变换为CDMA/TDMA,然后与CDMA信号在空间同频传输,这样就可以解决两个系统在Um接口的兼容问题;在接收端,使用相同的扩频码对CDMA/TDMA信号进行解扩,使其多址方式由CDMA/TDMA还原为TDMA,由此可以将GSM与CDMA两种信号进行分离。文章提出了用互补码集作为多址接入码,并给出了一个时隙内GSM用户被扩频调制的具体过程。理论分析和仿真结果表明,该方法可使系统总容量扩大2倍。     

Retail recovery from natural disasters: New Orleans versus eight other United States disaster sites

This study seeks to determine retail recovery patterns after a natural disaster and to provide useful information for areas recovering from a major disaster. The New Orleans metropolitan area serves as the primary area studied in this research due to Hurricane Katrina's status as the most costly natural disaster in the history of the United States. Eight additional cities that were impacted by natural disaster were also investigated in order to compare and contrast the retail recovery rate ofthese cities to New Orleans across 10 retail categories. The Yellow Pages telephone book and the United States Census of Retail Trade were utilized to determine recovery rates and the existence of possible patterns of recovery in each of the 10 retail categories. The analysis also includes a provision for population shifts due to the respective disasters. The results, which demonstrate both consistencies and inconsistencies across the disaster recovery areas, are discussed and future direction for retail recovery research is advanced.     

Gender differences in the intentions to voice complaints across different service failure modes

The present study investigates the joint impact of the service failure mode (interpersonal service versus self-service technology) and gender on consumers’ intention to voice their complaints. Results from a quasi-experiment suggest that female consumers are more likely to voice their dissatisfaction following a self-service technology failure rather than an interpersonal failure. However, the service failure mode fails to influence male consumers’ complaint intentions. Moreover, our findings indicate that motivation to help is the mechanism behind female consumers’ complaint behaviors, thus mediating the effect of service failure mode on complaint intention. Therefore, hospitality practitioners might want to pay attention to the differences in each gender’s complaint behaviors across different service failure modes and provide effective service recovery solutions across the two genders.     

Entering China Today

Summary

The peripherally growing and remarkably dynamic Chinese economy is now encouraging the use of more diverse and creative entry modes for international investors. This article illustrates various entry modes of foreign direct investment available at present to foreign companies entering China. These entry modes include equity joint ventures, wholly foreign owned subsidiaries, contractual joint ventures, umbrella companies, acquisitions, representative offices, branches, build-operate-transfers, licensing and franchising. The merits and limitations of each entry mode are discussed. Some practical advice on entry strategies for international executives active in the Chinese market is also highlighted.     

Using Games in Community Disaster Prevention Exercises

Currently, there is a growing interest in disaster prevention exercises such as games, debates, workshops, and “town walks” that involve the active participation of community members as an alternative to seminars in which disaster prevention experts simply share their knowledge and skills. We have developed a disaster prevention game called Crossroad for use in local disaster prevention programs. It is a group learning game, in which players read cards with a scenario written on each card. The scenarios were derived from extensive, focus-group interviews with disaster veterans of the Kobe Earthquake of 1995 that killed more than 6400 people and described the dilemmas faced by these veterans. To deal with the dilemma, each player was required to make a “Yes” or No decision on two conflicting alternatives. We used Crossroad as a part of tsunami disaster prevention, community-building workshops for citizens of Kishiwada city in Osaka, Japan. The results suggested the importance of motivating local people to find a socially “viable” solution through their own strength, rather than forcing a community to accept a universally “correct” solution prescribed in advance by outsiders. It is concluded that the Crossroad game can be used effectively as a new communication medium to promote the active participation of community members.     

Retailers׳ expansion mode choice in foreign markets: Antecedents for expansion mode choice in the light of internationalization theories

Whenever a retail company expands its store network in a foreign market, decisions have to be made about how this can be achieved. Existing studies of retail internationalization have usually analyzed the “entry mode” choice as an end in itself, and not as the start of a firm׳s international development. In addition, there is much debate in the academic literature about the antecedents for retail foreign operation mode choice and the relevance of generic internationalization theories to international retailing. Therefore, the objectives of this research are (1) to investigate the paths of entry and subsequent expansion modes pursued by retailers in international markets and (2) to develop and test a model of expansion mode antecedents in the light of generic business internationalization theories. This is achieved on the basis of data collected from 43 French fashion retailers and a PLS-SEM approach. Results show that (1) retailers clearly differentiate between entry and expansion modes; (2) the international marketing plan, the perceived attractiveness of the foreign market, and strategic and ownership conditions are the key antecedents for the choice of an expansion mode. After comparing the results with the explanations proposed by the generic internationalization theories, a multi-theoretical framework is proposed which draws from the Uppsala internationalization process model, network theory and the born-global theory. The findings provide a wealth of information for retailers׳ use in choosing appropriate foreign operation modes.     

一种新的分组无线网隐终端问题解决方案

在C-T/CDMA方式中，最主要的问题是发送端的每次数据发送是盲目的，因而冲突概率很高。本文把RTS/CTS短分组交换方式引入到C-T/CDMA方式中，提出一种基于RTS/CTS调度的多址方式，既解决了隐终端问题，又降低了冲突概率，从而提高了网络的性能。     

地铁与城际铁路共站换乘需求分析

随着城市化进程的加快,中心城区与卫星城镇之间客流交换速度激增,承栽着两组团间大规模客流交换的城际铁路与地铁之间的换乘必然日益频繁.依据换乘站点的规模与客流之间的相互影响关系,将城际铁路与地铁共站换乘方式分为单点、两点和多点三种类型.重点对各共站换乘方式的方向梯度、时间梯度、可达性梯度、费用梯度等进行抽象分析,构建共站节点需求双对教模型并进行回归分析,并引用实例对模型进行验证.为轨道线网接驳、合理选择节点共站模型和换乘方式等提供了依据.