Book Review

The diffusion of the Internet is becoming a central policy issue for developing countries, being identified by scholars as a key driver of knowledge, innovation and development. Remarkably, the related literature is scarce and fragmented. In order to contribute to fill this gap, we analyse Internet access and usage patterns in seven Latin American countries. In addition to the traditional socio-economic determinants of Internet access, the results also suggest an important role for network effects, presence of students at households and complementarities in Internet use at different locations. Concerning usage, estimations show that Internet access does not translate automatically into usage. In particular, females are found to be less likely to use the Internet, even once access is provided. Finally, the evidence suggests that while technological skills are necessary to fully exploit Internet potentialities, individuals located in rural areas are more likely to use the Internet for education purposes, confirming the potential connectivity impact on human capital.     

空调系统智能控制器的研究

介绍了一种用于空调自动控制系统的智能控制器。该智能控制器利用单片机技术 ,实现了对空调自动控制系统的自动监测 ,及时反应空调系统的故障 ;利用数字 PID技术 ,实现了对温度和湿度的优化控制 ,达到快速调温、减小温差和降低能耗的目的     

On the finite sample behavior of testing whether new is better than used of a specified age

Hollander, Park and Proschan (1986) proposed a test of new is better than used of a specified age. It is based on large sample normality of the test statistic. There is, however, no study in the literature on its actual size for small and moderate sample sizes. To shed some lights on this, the results of a Monte Carlo simulation study as well as two real data examples are reported and these indicate that the test can have a quite liberal size, especially for small to moderate sample sizes. In order to improve on this weakness, a modified test is proposed and studied. It is noticed that this modified test seems to over-correct the original test to an extent that it becomes unduly conservative sometimes. Hence we propose another modification that combines the original test and the modified test turns out to have its size quite close to the nominal level and is therefore preferable to both the original and modified tests.     

提高自身素质应对日益深化的高校图书馆数字化发展趋势

建设数字化图书馆是目前我国图书馆的发展趋势,而数字化图书馆对图书馆工作人员提出了新的要求:图书馆工作人员应具备熟练运用网络的技能;应不断加强政治思想素质,增强识别能力;加快知识的更新提高专业技能;改变服务观念,提高图书馆诚信度.     

The Effects of Prior Impressions of a Firm's Ethics on the Success of a Cause-Related Marketing Campaign: Do the Good Look Better While the Bad Look Worse?

ABSTRACT

The exploratory study that is the subject of this paper examines the importance of ten church service and program variables in the decision by members of different age cohorts to join a church. Variables that were investigated included aspects of the worship service; adult, children and senior education programs; and recreational activities. Two additional variables, denominational loyalty and the desire to be part of a spiritual community, were also investigated. Chi-square tests were used to evaluate the significance of each program as well as elements of the worship service. In addition, sources of information that members used prior to the first visit were examined. The most important resource was word-of-mouth. There were 460 respondents who were members of Southern Baptist and Unitarian Universalist churches located throughout the South and Southwest.     

中国已婚育龄人群避孕措施选择的偏好与影响因素分析

避孕节育是中国计划生育的核心内容之一，也是我国中长期人口发展战略中稳定低生育水平的重要措施之一。选取1988年全国生育节育抽样调查数据，利用多分类Logit模型（MNL）对不同特征育龄妇女避孕措施进行分析。不同生育周期和不同社会特征、子女性别、计划生育政策强度对已婚育龄人群避孕措施的选取有明显的影响。不同孩次的已婚育龄人群在避孕措施选择中都存在一定的避孕偏好，尤其是子女性别不同时呈现避孕措施选择的明显差异，即最小子女为女孩的育龄人群比最小子女为男孩的育龄人群更为倾向于选择避孕套等自控型短效避孕措施，提示避孕措施的选择存在制度内规避行为，并受到一定的性别偏好因素的影响。     

Retirement Age Considerations for Central Europe

The paper analyzes the arguments for and possible consequences of an increase in the statutory retirement age in central Europe, including the Czech Republic, Hungary, Poland and Slovakia. The analysis reflects the current and projected demographic and economic developments, and discerns the long-term trends from the specific aspects of transition. As for the long-term trends, the paper offers a simple framework for calculation of the intergenerational transfers through pensions under different reform scenarios. The calculations confirm that, in the aging central European societies, down-sizing of the existing pay-as-you-go schemes, including an increase in the statutory retirement age, is necessary to sustain solvency and intergenerational fairness in the public provision for retirement. The paper argues, however, that proposals to increase the retirement age in central European countries need to enhance their assessment of the possible counter-productive effects, which may arise due to the low working ability, poor health status and high occupational and environmental risks faced by the population.     

一种基于小波域的盲水印算法

提出了一种基于小波变换后频域系数的特征以及水印图像数据的奇偶性盲水印算法。该算法先将图像进行两级小波变换，根据LL2中数据特点和水印数据的奇偶性在HL2、LH2、HH2嵌入水印。在检测水印的时候，只需要拥有少量数据，就可以完成水印的提取。攻击实验研究表明：此算法具有很好的抗规则剪切、不规则剪切、加噪、压缩的能力，具有很好的鲁棒性。     

档案数字化立法保护探索

档案数字化的发展要求相关立法的跟进,本文通过分析档案数字化进程,论述了我国档案数字化立法的现状,提出了未来档案数字化立法的关键点和加强保护的设想,有助于档案数字化建设的健康发展。     

数字信号处理课程虚拟实验室设计

本文设计了一个基于校园网的数字信号处理课程虚拟实验室,该实验室可以通过远程控制为各实验设备单独供电,并通过开关矩阵灵活组合连接实验设备。运行表明虚拟实验室构造简便,结果正确,可以为学生提供一个方便的开放实验室。