基于动态逻辑许可证的PDF版权管理系统

电子文档版权管理是数字版权管理的重要研究领域,提出一种PDF电子文档版权保护方案,该方案的权限管理基于一种具有强大表达力、灵活性和开放权限管理能力的动态逻辑许可证,具有详细的文档权限控制方法,并通过内容级的PDF文档加密方法增强文档的安全性。对系统模型、实现结构和方法进行说明,并与相关方法进行对比和应用示例。     

Augmented reality in science laboratories: The effects of augmented reality on university students’ laboratory skills and attitudes toward science laboratories

This study investigated the effects of the use of augmented reality (AR) technologies in science laboratories on university students' laboratory skills and attitudes towards laboratories. A quasi-experimental pre-test/post-test control group design was employed. The participants were 76 first-year university students, aged 18–20 years old. They were assigned to either an experimental or a control group. Qualitative and quantitative data collection tools were used. The experimental results obtained following the 5-week application revealed that the AR technology significantly enhanced the development of the university students' laboratory skills. AR technology both improved the students’ laboratory skills and helped them to build positive attitudes towards physics laboratories. The statements of the students and the instructor regarding other effects of AR technology on science laboratories, both negative and positive, are also discussed.     

Framework to improve e-learner satisfaction and further strengthen e-learning implementation

In this study, a framework has been designed to guide institutions to better improve learner satisfaction and further strengthen their e-learning implementation. Undergraduate participants (n = 600) completed an online survey of 132 items. This article will first report on the development and validation of an instrument that attempts to reveal factors that affect user satisfaction, and then a multiple regression analysis and a path analysis help further investigate which factors can significantly predict learner satisfaction. The factor analysis identified 14 different factors. These factors were further categorized by the researchers into 6 dimensions i.e. learner dimension, instructor’s dimension, course dimension, technology dimension, design dimension, and the environment dimension. The multiple regression analysis showed that e-learners satisfaction can mostly be predicted by learner interaction with others. Findings of this research will help institutions by providing them with psychometric properties that add pedagogical value to e-courses.     

小型局域网下高校计算机实验室监控系统设计

近年来,全球互联网技术飞速发展,网络技术广泛应用于各个领域;随着网络技术的快速发展,我国各大高校开设计算机实验室,在高校范围内搭建的小型局域网中引入监控系统,辅助高校实验室的日常使用管理工作;传统的监控系统在小型局域网中存在数据资源交互消耗大、数据传输延迟高、视频数据储存空间利用率低等问题,给计算机实验室的日常管理带来不便;针对上述问题,提出小型局域网下高校计算机实验室监控系统设计;对数据交互过程中资源消耗大的问题,采用双协议传输单元进行资源交互算法的改进;对传统监控系统存在的数据传输延迟问题,采用数据阵列重组模组进行数据内部优化处理;采用ViodTM视频压缩单元,对监控视频进行算法核心压缩处理,从问题产生根源进行解决;通过实验证明,提出的小型局域网下高校计算机实验室监控系统设计,具有资源占用小、传输速度快、视频存储率高等特点。     

高校贫困学生辅助评价的研究

高校对贫困学生的认定存在认定成本高、可信度不强以及标准不一致等问题.本文通过分析高校一卡通的消费行为,刻画贫困学生的消费特征,应用马尔科夫模型对贫困学生消费行为进行建模,并提出了相似指标的概念和计算方法.通过对学生消费行为与贫困学生消费行为模型进行相似指标计算,对贫困学生进行认定.该方法具有计算效率高,速度快,计算成本低廉以及数据获取容易,在同一所学校中评价标准一致,对贫困学生的平均识别率达到90%以上等特点,可以作为高校在复评贫困学生的一个有力的辅助工具.     

一种改进的基于FFT的信号插值算法

在传统运用FFT进行信号插值运算的基础上,提出了一种提高插值精度的改进算法.通过子序列重叠和裁剪,舍弃重建序列边缘误差较大的样点,再将相对准确的样点进行重组,从而大幅提高插值精度.实验结果表明:与Prasad等算法相比,在计算量增加3.1％的情况下,不同子序列长度对应的归一化均方误差平均下降至原来的1/19;在计算量增加2倍的情况下,不同子序列长度对应的归一化均方误差平均下降至原来的1/75.     

二维码与医院应用

二维码是近年来逐步走入大众的一种信息编码方式,随着手机网络的发展,它的应用越来广泛,文章结合医院业务,给出二维码可能的使用方式,希望能对医院信息系统及医院业务的开展、设计有借鉴作用。     

基于线程池的高并发访问考试系统设计

大量的考生机同时访问现有的考试系统会造成服务器响应缓慢甚至崩溃。基于线程池的高并发访问考试系统,采取线程池控制考试系统对数据库的操作等措施,实现考生机对考试系统的高并发访问。介绍该考试系统的设计框架,主要功能及工作流程和线程池模块的设计。