关于可信软件开发的若干问题思考

在信息科学时代,现代社会的发展日益依赖软件,实现可信软件的开发在一定程度上契合现代社会的需求,也是自身发展的内部需求。但是,可信软件的开发是一个系统而复杂的过程,强调可信软件开发中各方工作的有效落实。本文分析了可信软件的研究现状,阐述了软件架构与开发,并基于此,论述了强化软件架构,开发可信软件的若干建议。本文旨在强化对可信软件的认识,并为今后相关领域的研究提供一定的参考资料。     

电子信息科技英语的教学实践

为培养复合型人才,科技英语教学的重要性日益显现。分析了目前电子信息类专业中科技英语教学存在的问题,并围绕教学内容改革、教学过程管理等介绍了该课程的教学实践。同时,本文还指出未来科技英语教学的发展趋势。     

基于时序特征和集成算法的用户购买预测

大数据时代,电商平台积累了大量用户在平台上的行为数据,比如浏览、点击、下单和加入购物车等等.如何使用机器学习算法去探索大数据背后的用户消费喜好和习惯成为了一个新的研究热点.本文主要在特征工程和模型搭建两个方面对用户购买预测的效果做出提高.通过深入理解电商业务知识,利用统计学知识,分别从用户、商品和评论数据等多个方面的数据构建了115个特征;在模型搭建方面,主要设计了一个两层融合模型,第一层采用了XGBoost、CatBoost和逻辑回归作为基分类器,从不同的角度考虑用户购买预测,第二层采用加权平均的方法对基类模型的预测结果进行融合,其权重由线性分类器学习生成.实验结果表明该融合模型的F1评分要高于个体分类器,并且多次实验证明,融合模型的稳定性也要比个体分类器好.     

The impact of CCT on driving safety in the normal and accident situation: A VR-based experimental study

Correlated color temperature (CCT) of the light source inside the road tunnel plays a crucial role in ensuring driving safety, which is demonstrated by previous studies that CCT influences not only visual effects but also non-visual effects. Although conventional laboratory experiments could simulate the CCT environment inside the tunnel to some extent, they fail to restore driving experience, let alone simulate driving behavior in the accident situation. It has largely remained unclear whether and how CCT would influence visual/non-visual performance of the subjects who are performing driving tasks, especially in the accident situation. Motivated by this gap, a virtual-reality-based framework for assessing the influence of CCT on the visual and non/visual performance in normal driving situation and in accident situation was proposed. In this study, tunnel models under seven different CCTs were created and a rear-end accident was designed in the tunnel. By integrating analog driving equipment, all participants were required to perform virtual driving tasks both in the normal situation and in the accident situation. The non-visual performance (driving fatigue) and the visual performance (reaction time) of the participants were collected and analyzed. Results show that the CCT of light source inside the tunnel was significant on the driving fatigue of the driver who was performing driving task, and it also had a significant impact on the visual performance when the driver was faced with a rear-end accident. Detailed experimental methodology, behavioral explanations underlying these findings, validity of results and practical implications are also discussed in the paper.     

SFT中的因素作用路径与作用历史

为了描述SFT中系统或元件在不同工作环境状态下经历变化的特征,提出了因素作用路径和作用历史的概念。作用路径描述系统或元件在不同工作状态变化过程中所经历状态的集合。作用历史描述经历作用路径过程中的可积累状态量。给出使用作用路径和作用历史分析问题的步骤。列举一例子,计算在设定条件下的元件维护成本。计算作用路径分别为AB和ACB两种,作用历史中使元件故障概率等于20%的维护成本,该维护成本是通过调整使用时间t和使用温度c产生的。最后给出以实例为背景的作用历史计算方法的不足、面临的问题和可能的解决方法。     

Research and Application of Dynamic Equation for Full Frontal Impact

Full frontal impact theory needs researching and exploring to satisfy the primary safety design of occupant restraint system,avoiding the increasingly "engineering"trend in order to develop and design safety vehicle. After occupant restraint system is simulated by using linear elastic stiffness k,the occupant-vehicle frontal rigid barrier impact model is established. Dynamic equation of dummy chest coupling vehicle is built for full frontal impact based on ordinary vehicle deceleration by Hooke law,and the equation is solved by comparing coefficient and satisfying boundary qualifications. While relative vehicle characteristic parameters are kept unchanging,the actual vehicle deceleration is fitted to the simplified equivalent square wave( ESW),tipped equivalent square wave( TESW) and equivalent dual trapezoids wave( EDTW). Phase angle  and amplitude A of dynamic equations based on ESW,TESW and EDTW are calculated and deduced. The results show that: the dynamic equation of dummy chest coupling vehicle can be well utilized to instruct the primary safety design of full frontal impact for objective vehicle to satisfy chest deceleration demands and the equation based on TESW is best for this design.     

以品牌专业建设为契机 抓住发展机遇 全面提高专业建设质量

专业建设是高等学校最重要的教学基本建设,是教育教学工作的基础和重要生命线,是高等学校人才培养的重要依托。加强本科品牌专业的建设可提升学校本科专业建设的整体水平,提高学校本科人才培养质量、效益和竞争力。文章围绕如何开展品牌专业建设,结合学校实际,着重从品牌专业内涵、建设原则、内容和评价办法等方面进行了阐述。     

基于 Isomap的 CWME专家群体意见分析系统

针对从定性到定量综合集成研讨厅体系 ,对复杂问题分析过程中的专家群体的分散化思维 ,提出并实现了一种基于自动调查问卷的群体意见相似性定性分析方法。此方法基于群体行为的相似性特征对调查问卷的相似性度进行量化统计 ,并采用 Isomap算法将问卷量化之后产生的多维数据集进行降维及可视化表示。     

逆向工程在模具翻新中的应用

利用激光扫描仪及相关CAD三维软件,并用最终产品做辅助,对陈旧的潜水面罩模具进行三维模型的设计,介绍了逆向工程在模具翻新中的应用方法。