基于同构本体结构的企业系统语义复杂度

企业信息系统建设和集成过程产生的复杂度很大程度上决定于系统业务模型的语义复杂度。建立企业业务系统的语义复杂度测度模型是有效控制复杂度攀升的关键。建立企业系统的同构本体结构及其形式化方法的相关定义、定理,给出语义复杂度定义和测度方法。与聚合体系结构方法建模的企业系统进行语义复杂度的比较分析。结果显示,基于同构本体结构的企业系统建模过程具有最低的语义复杂度,语义复杂度不随系统建模过程发生变化,并且调整系统规模和系统集成过程不产生新的信息熵。理论上证实同构本体结构很可能是企业系统建模的最优结构,研究成果为企业系统开发和建模提供理论方法的指导。     

Systematic characterization of degas-driven flow for poly(dimethylsiloxane) microfluidic devices

Degas-driven flow is a novel phenomenon used to propel fluids in poly(dimethylsiloxane) (PDMS)-based microfluidic devices without requiring any external power. This method takes advantage of the inherently high porosity and air solubility of PDMS by removing air molecules from the bulk PDMS before initiating the flow. The dynamics of degas-driven flow are dependent on the channel and device geometries and are highly sensitive to temporal parameters. These dependencies have not been fully characterized, hindering broad use of degas-driven flow as a microfluidic pumping mechanism. Here, we characterize, for the first time, the effect of various parameters on the dynamics of degas-driven flow, including channel geometry, PDMS thickness, PDMS exposure area, vacuum degassing time, and idle time at atmospheric pressure before loading. We investigate the effect of these parameters on flow velocity as well as channel fill time for the degas-driven flow process. Using our devices, we achieved reproducible flow with a standard deviation of less than 8% for flow velocity, as well as maximum flow rates of up to 3 nL∕s and mean flow rates of approximately 1-1.5 nL∕s. Parameters such as channel surface area and PDMS chip exposure area were found to have negligible impact on degas-driven flow dynamics, whereas channel cross-sectional area, degas time, PDMS thickness, and idle time were found to have a larger impact. In addition, we develop a physical model that can predict mean flow velocities within 6% of experimental values and can be used as a tool for future design of PDMS-based microfluidic devices that utilize degas-driven flow.     

Comparison of Knowledge and Attitudes Using Computer-based and Face-to-Face Personal Hygiene Training Methods in Food Processing Facilities

ABSTRACT:  Computer-based training is increasingly favored by food companies for training workers due to convenience, self-pacing ability, and ease of use. The objectives of this study were to determine if personal hygiene training, offered through a computer-based method, is as effective as a face-to-face method in knowledge acquisition and improved attitude toward food safety. Employees from four food processing facilities ( n = 94) were randomly assigned to a control group, a face-to-face training group, or a computer-based training group. Evaluation instruments consisted of a pretest and a posttest to measure knowledge gain, a step scale to measure attitude after training and retrospectively before training, and a brief set of interview questions. Results for both treatments and the control group indicated increases in knowledge. Analysis of the posttest scores, when controlling for the pretest scores, indicated the difference was significant ( P ≤ 0.05); however, post hoc analysis did not indicate which treatment was superior. There was a significant increase in attitude scores for both groups using paired t -tests, although the difference between groups was not significant when controlling for attitude scores before training. Issues that may limit application of the technology used in this study include low literacy and language barriers among employees, and time constraints within companies. These and other variables should be taken into account in future research studies addressing comparisons of training methods. This study is the first to demonstrate the effectiveness of computer-based training aimed at food handlers who work in food processing establishments.     

鞍山科技大学《学生体质健康标准》测试结果分析

为实施完成《大学生体质健康标准》（以下简（标准》）测试工作，鞍山科大对2003年本科学生的身体形态、机能和身体素质进行了规范性检测工作，获得了被试体质健康现状的基本资料，并与《标准》进行了比较分析。结果表明，鞍山科大学生体质测试总平均成绩75分，及格率97．24％，但良好率不足48％说明学生体质健康状况与《标准》要求尚有距离，总体水平不高。为此，提出了增强学生体质必须重视身体素质是改善提高身体形态机能的基础条件的荐认识等建议。     

我国图书馆自动化系统市场发展预测研究

文章在对我国图书馆自动化系统市场现状进行分析的基础上，预测了我国图书馆自动化系统市场发展需求曲线的变化趋势，提出了我国图书馆自动化系统市场的发展策略。     

行动研究从这里起航——县级教科所与农村中小学合作研究的实践探索

行动研究符合教师研究的特点,在推进课程改革的大环境中,已成为县级中小学科研人员与教师合作研究的主要形式。在行动研究中,教师自我发展动力由缺失走向主动,教师眼中的“研究”在实践探索中转变,教师校本研究在客观条件的限制下也在寻求突破。而科研态度暧昧、研究行动淡漠、研究经费无着、缺乏政策支持是开展校本行动研究的突出问题。     

Capital and Knowledge Flows: Global higher education markets

Accelerating global flows of people and information have formed new communities and networks across social and political borders. Higher education is one such globalised knowledge community in which new patterns of knowledge, accreditation, research alliances, and social and professional relationships are emerging. In this paper I outline the push–pull dynamics of globalisation in higher education: the co-constitutive nature of local and global interests and educational formations; disjunctive flows of capital, information, people, and knowledge; and the new politics of knowledge capital as they affect academic research and the public archive of scholarly publishing and university libraries. I close with reflections on the differential consequences of globalisation on: the role of the nation state in higher education provision and reform; the role of education in nation building and national identity politics; and the governability of a global eduscape.     

合并高校办刊管理模式的探讨--以《扬州大学学报》为例

高校的合并促使学校学报的办刊体制发生改变。合并高校学报必须从中国高等教育发展的客观实际出发，进行重组和再分工，改变办刊管理模式，为合并高校学报的健康发展提供科学的制度保障和坚实的物质基础，以利于合并高校学报适应新的环境变化，保证刊物的可持续发展。