25%小偏置碰撞策略及测试评估研究

随着汽车事故的增加,且小重叠碰撞事故死亡率居高不下,小偏置碰撞试验逐渐成为焦点。基于IIHS公布的最新车辆碰撞试验结果,统计超过100余款不同类型的25%小偏置碰撞车辆,建立碰撞转角与碰撞区域的数学模型,将25%小偏置碰撞归结为三种不同的碰撞策略,分别是吸能策略、掠过策略和掠过与吸能策略;并进行试验验证,对三种策略的优缺点进行分析。结果表明,小偏置碰撞试验可运用合理的碰撞策略达到法规要求,对25%小偏置碰撞试验具有一定的参考价值。     

基于儿童使用主体的建成环境评价尺度研究

评价尺度是建筑使用后评价的基 本问题之一，它是使用者评判建成环境好 坏、优劣的重要测度标准。为弥补目前环境 评价尺度研究方面的缺失，建立与儿童使用 主体相一致的建成环境评价尺度，对儿童常 用语义量词进行汇总和筛选，采用五级线 分刻度方法进行问卷调查研究。基于儿童的 理解，通过问卷试验分析，结果表明：双侧 5级区间评价尺度为：很（负面）；有点（负 面）；中等；有点（正面）；很（正面）；单侧 5级区间评价尺度为：不；好像有点；比较； 很；特别。     

石油套管质量评价方法研究

石油套管是油气田开采中重要的物资装备,其质量直接影响油气田的生产安全与开采效率。对石油套管质量评价方法进行研究,优选反映石油套管质量的性能参数,通过归一化处理,结合专家知识,建立评价模型,进而得到石油套管质量的评价结果。将所研究的评价方法应用于P110石油套管质量评价中,评价结果准确、直观,方法有效实用。     

矿产资源供应能力评价的FAHP方法

为了合理地开发和利用资源，提高资源利用效率和矿业发展质量，科学论证与评价矿产资源供应能力，具有重要的理论意义和现实意义。采用定性定量相结合的模糊层次分析法（FAHP），构建了矿产资源的供应能力的评价模型，并以我国2006—2015年钴资源的历史数据为例，将资源禀赋、供需市场、政治环境作为评价准则，通过对评价指标进行分析，得到了钴资源供应能力的评价值均在1以下，并呈现逐年下降趋势。研究结果表明，我国钴资源的供应能力整体偏弱，今后几年钴资源供应能力仍会维持在较低水平。     

山东栖霞—大柳行地区金矿找矿靶区地质评价及优选

栖霞—大柳行地区位于胶东中部栖霞—蓬莱金矿成矿带内，是胶东重要的金成矿区，成矿条件优越。为了对圈定靶区进行优选分类，通过对该区地质背景、找矿靶区评价、找矿靶区优选方面展开综合研究，并结合勘查工作程度和矿业权设置情况，划分出3类预测区，选定了5个靶区为今后优先部署勘查工作的方向。     

Time-series clustering – A decade review

Clustering is a solution for classifying enormous data when there is not any early knowledge about classes. With emerging new concepts like cloud computing and big data and their vast applications in recent years, research works have been increased on unsupervised solutions like clustering algorithms to extract knowledge from this avalanche of data. Clustering time-series data has been used in diverse scientific areas to discover patterns which empower data analysts to extract valuable information from complex and massive datasets. In case of huge datasets, using supervised classification solutions is almost impossible, while clustering can solve this problem using un-supervised approaches. In this research work, the focus is on time-series data, which is one of the popular data types in clustering problems and is broadly used from gene expression data in biology to stock market analysis in finance. This review will expose four main components of time-series clustering and is aimed to represent an updated investigation on the trend of improvements in efficiency, quality and complexity of clustering time-series approaches during the last decade and enlighten new paths for future works.     

Programming assistance tools to support the learning of IT programming in South African secondary schools

Novice programmers struggle to understand introductory programming concepts and this difficulty, associated with learning to program, contributes mainly to the lack of interest in the field of Computer Science at tertiary level. Programming assistance tools have been used to assist novice programmers extensively at education institutions. A programming assistance tool (PAT) is a software program that can be used by novice programmers to learn how to program and/or improve their understanding of programming concepts.This research proposes that novice programmers, specifically Information Technology (IT) scholars in South African secondary schools, could be supported by PATs. The main objective of this research was to determine whether the use of a PAT impacted IT scholars' understanding of programming concepts and their motivation towards programming in general. Criteria for the selection of PATs were derived from the programming difficulties identified in literature and from surveys to IT teachers and scholars. The selection criteria were grouped into programming knowledge and programming skills categories. Existing PATs were evaluated using the selection criteria and three PATs, namely, RoboMind, Scratch and B#, were selected for evaluation in this research study. A convenience sample of schools participated in the study. The three PATs provided different approaches while being able to support the Delphi programming language used in schools that participated in the study.The findings of this research indicated that, although scholars perceived the PATs to be useful in the explanation of certain of the programming concepts, there was no conclusive evidence that IT scholars who used a PAT had a significantly better understanding of programming concepts and motivation towards programming than scholars who did not use a PAT. Participant feedback was used to identify the strengths and shortcomings of the three PATs and to provide recommendations for the development of future PATs specifically designed to support IT scholars.     

基于可信计算构筑物联网安全边界

近年来，中国物联网政策支持力度不断加大，技术创新成果接连涌现，各领域应用持续深化，产业规模保持快速增长。本论文以物联网接入边界为切入点，探讨了物联网安全接入问题的解决方案。设计了基于可信计算3.0的物联网可信网关，以及安全管理中心，构建了可信的物联网安全边界接入系统。为各种异构物联网终端设备提供了安全屏障，隔绝了针对于物联网设备的网络安全威胁。     

基于熵权-灰色关联分析的电动汽车充电基础设施PPP项目风险评价研究

电动汽车充电基础设施PPP项目的建设和实施,不仅可以有效缓解政府财政和管理压力,还可以借助社会资本先进的管理运营经验,提高充电服务供给效率,实现双赢。但是,电动汽车充电基础设施PPP项目具有投资大、特许运营期长等特点,同时还涉及多个项目参与者,关系复杂,潜在的风险因素较多。文章通过文献梳理,首先识别出了电动汽车充电基础设施PPP项目潜在的风险因素,从宏观、中观、微观三个层次建立了基于项目全生命周期的风险评价指标体系,然后建立了基于熵权-灰色关联分析的项目风险评价模型。最后,以T市电动汽车充电基础设施PPP项目为例进行了实证分析,并根据风险评价的结果,从不同项目参与方的角度提出了风险应对的策略。