Distributed anonymous data perturbation method for privacy-preserving data mining

Privacy is a critical requirement in distributed data mining. Cryptography-based secure multiparty computation is a main approach for privacy preserving. However, it shows poor performance in large scale distributed systems. Meanwhile, data perturbation techniques are comparatively efficient but are mainly used in centralized privacy-preserving data mining （PPDM）. In this paper, we propose a light-weight anonymous data perturbation method for efficient privacy preserving in distributed data mining. We first define the privacy constraints for data perturbation based PPDM in a semi-honest distributed environment. Two protocols are proposed to address these constraints and protect data statistics and the randomization process against collusion attacks： the adaptive privacy-preserving summary protocol and the anonymous exchange protocol. Finally, a distributed data perturbation framework based on these protocols is proposed to realize distributed PPDM. Experiment results show that our approach achieves a high security level and is very efficient in a large scale distributed environment.     

SET协议的分析及改进

本文概述了SET协议的交易模型的参与者以及SET协议中的有关安全加密技术及其应用，分析了SET协议中安全机制的不足，并针对不可否认性提出了相关解决方案，引进了密钥托管技术。     

决策树ID3算法分析及改进

决策树通过对获取的样本数据属性使用信息论知识原理进行解析和归纳,最终形成类似于流程图的树型结构形式。ID3算法是典型采用贪心算法的归纳学习算法,其使用递归方式采用贪心算法来生成决策树。与其他分类技术算法比较,ID3算法有着自己的优势,但在实际应用中,采用决策树ID3算法进行分类时,需要先对数据进行一些处理或改进。     

不同速度高速列车车外噪声的调查研究

研究目的：基于声源识别,得出车外噪声分布特性及场点主要噪声源。创新要点：1．研究高速列车噪声源强特性及频谱特性;2．揭示不同速度下不同声源频谱变化规律;3．分析车外声场场点噪声变化规律及主要声源。研究方法：1．利用车外声源识别系统（图2）分析高速列车声源分布规律及频谱特性;2．利用声源的垂向（图10）分布研究不同声源在各频率下垂向分布规律;3．利用场点声源与速度的拟合关系（图16）研究场点主要噪声源。重要结论：1．高速列车车外噪声源主要分布在轮轨区域、受电弓和车间连接区域;2．轮轨区域噪声包括滚动噪声和气动噪声,在各频率均为最显著声源;3．在整个列车高度,轮轨滚动噪声对总噪声贡献率大于气动噪声;4．车外场点噪声主要频率为630-2500Hz,主要来自轮轨滚动噪声。     

基于无线局域网的机车牵引实验数据采集传输系统

在机车牵引实验中,机车与实验车之间的相对位置较为固定,机车与实验车之间是通过电缆线传输试验数据,这种传统的数据传输方式不但效率低下,而且数据传输的可靠性也有限。为此特设计一种全新的牵引实验车数据无线传输系统来进一步提高牵引实验的工作效率和实验数据传输的可靠性。     

基于Dr．COM软件的外置式校园网用户管理系统的实现

在ACCESS窗体中通过VBA自动操作本地数据库,自动启动和运行WORD中的VBA代码——自动将数据库中数据形成WORD文档、自动打印、命名和存档到指定目录中。最后在VBA中经WINDOWSAPI调用自动启动、操作和将ACCESS中的数据填充到Dr．COM软件中。实现外置式校园网用户管理系统的效果。     

成人高等教育专业教学计划制定工作若干问题思考

本文针对成人高等教育专业教学计划及其课程设置中存在的问题，从培养实用型人才的角度，对培养目标、制定原则、教学计划构成、学习年限、课程设置等问题进行分析与思考。     

The intersection of school context and teachers’ data use practice: Implications for an integrated approach to capacity building

The current emphasis on data is a powerful force behind educational reform strategies. Administrators and teachers are inundated with data and increased expectations for data-driven practices in an effort to drive school reform. This mixed method study examined teachers’ experiences in a pilot professional development program to enhance data literacy and data use practices among nine grade-level elementary and middle school teacher teams in a single school district. Pre, post and follow-up surveys of the 28 teacher participants revealed promising outcomes of the professional development program. Significant increases in teachers’ reported data literacy, efficacy, and collaboration were evident. The study also examined school-level factors that supported data use practices and data cultures. Interviews with 15 school principals revealed how structural features such as district requirements, school expectations, and established policies and routines influenced teachers’ data use practice. Structural factors facilitating collaboration were associated with instructional goals and improvement cultures.     

建设高职院校数字化校园的探讨

数字化校园是指利用计算机技术、网络技术、通信技术，对学校与教学、科研、管理和生活服务有关的所有信息资源进行全面的数字化。本文针对高等职业院校的特点，从数字化环境、数字化管理、数字化学习、数字化科研和数字化生活五个方面全面阐述了数字化校园的建设方案。