Ideas: A system for international data exchange and access for science

An operational prototype inhomogeneous distributed database system has been built to provide homogeneous access for researchers and managers of science policy to data on research projects held in three countries. The architecture is sufficiently general not only to accommodate additional countries and databases on research projects, but also to provide a general framework for other international collaborative projects aimed at the provision of information. The design exhibits an optimal compromise between sufficient data to satisfy a retrieval request and the minimal data for transmission to maintain the database.     

IT Education and Workforce Participation: A New Era for Women in Kenya?

While Sub-Saharan African women have historically assumed the roles of both housewives and subsistence farmers, they have had few opportunities to participate in the modern economies of the region. However, this trend is changing with the exponential growth of information and communications technologies (ICT), giving many Sub-Sahara African women access to computers, the Internet, and other related technologies. Based on the work of a four-member research team from Kenya and the United States, this article examines the integration of female college students into the formal ICT work sector in Kenya. We do so by examining major bottlenecks and enablers to such integration from historical and contemporary perspectives. Using an interpretive approach, we conducted 32 interviews with women in an ICT program offered by a university in Kenya. Our findings indicate that women were highly optimistic, embracing ICT as a practical mechanism for achieving entry into the labor market. However, they perceived significant structural barriers, such as public policies that failed to facilitate the development of the ICT sector, gender discrimination by employers, and training that provided them with insufficient technical skills to enable them to effectively perform in the workplace. These findings largely confirm the gendered perspectives found in similar studies conducted in other countries. However, what appear as global perspectives are informed by the local causes.     

Working for Barrier Removal in the ICT Area: Creating a More Accessible and Inclusive Canada

This article describes the rights-based approach to access to information and communications technologies (ICT) used by the Council of Canadians with Disabilities (CCD). This approach challenges the thinking of policymakers, those in industry, and others who argue that access to ICT can be achieved through a variety of economic, business, or market-based perspectives. It argues that these approaches have failed to deliver accessible ICT to people with disabilities, and that improved legislation, regulation, policy, and programs are required to remove the barriers to ICT experienced by people with disabilities in Canada.     

多环技术分析比较

分析了采用多环技术实现有伸缩能力的各种组通信方法,并按照恶劣环境中所要求的安全性和可自救性等对各种技术进行了分类比较。     

Integrating synchronous and asynchronous internet distributed education for maximum effectiveness

Distributed education delivered via the Internet is a growing practice, with most institutions offering at least course websites and many expanding to full course offerings and even online degree progams. There are two schools of thought with regard to delivery mode: the larger group has focused on asynchronous delivery, accessible at any time via webpages and interactive tutorials and quizzes, while a smaller group advocates synchronous delivery where students are online and interact during class time. This paper summarizes the advantages and disadvantages of the two delivery modes and describes our successful and growing experience of more than a decade using an open source synchronous delivery tool blended with a variety of asynchronous capabilities and classroom instruction. We conclude that a synergistic combination of the two modes with in-person instruction, designed to provide maximum flexibility to the student within the constraints of the subject, offers the best support for student learning. www:     

供配电计算机模拟演示系统的设计与实现

提出一种供配电计算机模拟演示系统，通过设计系统的硬件和软件，给出演示功能和监控功能的实现方法，并说明了系统的特点。     

Learning environments on the World Wide Web: experiences from Astronomy On-Line

In this article the Astronomy On-Line (AOL) learning experiment on World Wide Web (WWW) is described. As a part of AOL, educational research was carried out. The purpose of this study was to measure how students experience the new medium in their learning and how students utilize the communication facilities (group e-mail, real-time discussion) available through the WWW site. This study also describes the computational facilities available among AOL participants all around Europe     

Application of FTAM in Global Roam Account System

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基于短跨度交织的选择性映射

为了抑制多载波通信中发送信号相对较高的峰值功率,提出了一种新的基于交织的选择性映射方案.在该方案中,采用一组交织跨度仅为几个比特的比特级交织器来产生多个表示相同信息的序列,从中选择对应信号峰均比最低的序列作为发送的序列.描述了该方案的实现方式以及这种短跨度交织器的结构.通过仿真考察了该映射方案在降低多载波信号峰均比方面的性能.结果表明该方案在抑制峰均比方面呈现出很好的性能,对于高阶调制信号,如16QAM和64QAM,它甚至达到选择性映射所能实现的最佳性能.与传统的基于交织的选择性映射方案相比较,这种基于短跨度交织的选择性映射方案产生非常短的时间延迟,只需要很少的缓冲寄存器,且易于用硬件实现.     

浅论整合营销传播三要素

整合营销传播是一种全新的营销理念和传播方法。其核心是一切要以消费者为中心,凡是与消费者相关的一切活动都可以纳入营销的范围,可以运用多种传播方式为营销服务。广告、公关、促销三种传播手段的推广组合可以使整合营销传播达到理想的宣传效果。