基于RBAC的访问控制在信息系统中的应用     

陈新疆  薛琳 《临沂师范学院学报》2006,28(6):106-109

访问控制是管理信息系统经常采用的安全措施之一．对RBAC(基于角色的访问控制机制)的基本原理进行介绍,然后结合某档案管理信息系统的开发实例,介绍了RBAC在信息管理系统中的设计和应用．  相似文献   

The effectiveness of post-16 pathways for gaining employment associated with undergraduate degree study     

Katy Joy 《Journal of Further & Higher Education》2018,42(7):953-968

This article sets out to examine the effectiveness of five different post-16 study pathways and the impact that spending time away from education has on gaining employment associated with an undergraduate degree. It also explores advice and guidance for students looking at post-16 study options, higher education and employment. An initial online survey was used, followed by case studies to form a mixed-method approach. The findings suggest that a vocational pathway better prepares students for making decisions around employment and study in comparison to the more traditional A Level pathway. They also highlight that a period of one to four years after finishing post-16 study and starting undergraduate degree study is the most effective for students to gain employment associated with their undergraduate degree. Finally, it was found that most participants did not have positive experiences with advice and guidance regardless of their pathway.  相似文献   

小麦生育后期限量供水对生理指标的影响     

陈玮  员冬梅  李忠民 《三门峡职业技术学院学报》2004,3(2):69-70

采用盆栽方法,在小麦生育后期控水条件下研究干旱对小麦产生的生理影响。结果表明:小麦生育后期不同时段对土壤水分亏缺的敏感程度不同。轻度水分亏缺促使旗叶水势增大,光合速率提高,蒸腾速率下降,灌浆速率下降,灌浆高峰提前。在花后10天内轻度水分亏缺,可提高光合速率,并保持较长时间。因此,本研究认为土壤最大毛管含水量为50%-55%,并在小麦花后10天内成为一个重要的控水指标。  相似文献   

A Random Multi-Access Method for Data Services in CDMA Cellular System     

李振  尤肖虎 《东南大学学报》1997,(2)

ＡＲａｎｄｏｍＭｕｌｔｉＡｃｃｅｓｓＭｅｔｈｏｄｆｏｒＤａｔａＳｅｒｖｉｃｅｓｉｎＣＤＭＡＣｅｌｕｌａｒＳｙｓｔｅｍＬｉＺｈｅｎ（李振）ＹｏｕＸｉａｏｈｕ（尤肖虎）（ＮａｔｉｏｎａｌＭｏｂｉｌｅＣｏｍｍｕｎｉｃａｔｉｏｎｓＲｅｓｅａｒｃｈＬａｂｏｒ...  相似文献   

从高职入口看我国高等职业教育改革     

汤光伟 《武汉职业技术学院学报》2007,6(2):17-19

我国现有高职入口模式“门槛高”、“面向窄”，不适应职业教育的发展方向。我们要改革高职入口模式，坚持以考查职业技能为主，面向全民，建立相关改革配套措施，推动全民职业素质的提高。  相似文献   

Three dimensions of equity of access to higher education     

Tristan McCowan 《Compare》2016,46(4):645-665

Concerns over equity of access to higher education are widespread, but there is significant disagreement over what should constitute a fair system. This article assesses diverse conceptualisations of equity and explores the ways in which they embody themselves in the policies of three systems, those of England, Brazil and Kenya. While showing significant disparities of income level and enrolment ratio, all three have made concerted efforts to expand higher education access, accompanied by increasing stratification in terms of the quality and prestige of institutions. Analysis of policy options and outcomes leads to a proposal of three principles for understanding equity of access: availability, accessibility and horizontality. The third of these principles addresses the little-acknowledged safeguard that disadvantaged students should not be confined to lower-quality institutions, while at the same time allowing for diversity of ethos and disciplinary focus.  相似文献   

基于无线通信的静止式进相器系统设计     

常雨芳  黄文聪 《教育技术导刊》2006,(15)

静止式进相器是专为大中型绕线式电机节能降耗设计的无功功率就地补偿装置。现有静止式进相器仅停留在单台电动机和单台静止式进相器的配套使用上,缺乏监控系统、历史数据无法保存。详细介绍了基于无线通信的静止式进相器系统设计,系统由静止式进相器控制子系统和主控子系统组成,使用无线通信模块实现静止式进相器和主控机的通信。主控子系统设计中,采用预约ALOHA实现主控子系统的多址通信。该系统经过实验和现场调试,其结果表明:静止式进相器补偿效果明显,实现系统无线通信功能,满足无线监测的设计要求。  相似文献   

New Media/Internet Research Topics of the Association of Internet Researchers     

Ronald E. Rice 《The Information Society》2005,21(4):285-299

This study summarizes prior reviews of new media and Internet research, and the growth of the term Internet in academic publications and online newsgroups. It then uses semantic network analysis to summarize the interests and concepts of an interdisciplinary group of Internet researchers, as represented by session titles and paper titles and abstracts from the 2003 and 2004 Association of Internet Researchers conferences. In both years, the most frequent words appearing in the paper abstracts included Internet, online, community, social, technology, and research. The 2003 papers emphasized topics such as the social analysis/research of online/Internet communication, community, and information, with particular coverage of access, individuals, groups, digital media, culture; role and process in e-organizations; and world development. The 2004 papers emphasized topics such as access; news and social issues; the role of individuals in communities; user-based studies; usage data; and blogs, women, and search policy, among others.  相似文献   

Gaps and Bits: Conceptualizing Measurements for Digital Divide/s   总被引：1，自引：0，他引：1  

Karine Barzilai-Nahon 《The Information Society》2006,22(5):269-278

Three arguments are raised in this article with regard to the indices used to measure the digital divide. First, I criticize policymakers who rely on simplistic measures of the digital divide, at the expense of a thoughtful analysis of (1) the purpose of the tool, (2) the level of observation, and (3) the method of approaching the data. Second, I argue that networks and associated technologies are not neutral artifacts but are political and social spaces in their structure as well as in their content levels. Accordingly, we need to factor in the context as an important actor in conceptualizing and measuring the digital divide. Third, two general types of indices are used for the measurement of the digital divide(s): focused monotopical indices and comprehensive indices. Monotopical indices are more widely available, while comprehensive ones are rare. I argue that policymakers need to promote comprehensive indices over monotopical indices. Finally, I present a conceptual definition of the digital divide and a framework for developing a comprehensive index to measure it.  相似文献   

中外在线档案资源获取比较分析   总被引：2，自引：0，他引：2  

邓君  王强 《情报科学》2007,25(2):221-225

通过对国内外代表性档案网站的调查,对国内外在线档案资源获取进行了综合性比较。从档案网站主要内容、政府文件获取途径、站内信息检索方式以及档案资源获取权限设置等方面进行了共性分析;从档案资源获取模式、提供全文获取能力与档案资源丰富性以及辅助检索功能设置等方面进行了差异性分析,指出我国在线资源获取存在的问题与不足,有针对性地提出今后在线档案资源开发与获取的发展对策。  相似文献