基于IFC标准的施工信息模型至图数据库的自动映射机制及其应用

工业基础类(industry foundation classes, IFC)文件是建筑信息模型的数据存储和交互的标准通用文件,其难以直接被用于数据分析和数据挖掘。图数据在描述数据间复杂关联关系时具有天然的优势,被大量应用于对关联关系的分析和挖掘中。建立从IFC文件到图数据库的自动映射机制,将IFC文件中的实体及其关联关系一一映射至图数据库的节点和关系中,并分析该自动映射机制的完备性和基于图数据库的信息管理效率。映射得到的基于图数据库的施工信息模型被应用于施工离散事件仿真、施工进度网络分析和施工延迟分析中。分析结果表明,提出的自动映射机制能够完整地传递基于IFC标准的信息,映射效率满足施工过程中信息高效交互的需求,且基于图数据的信息管理效率也高于直接操作IFC文件的效率。在此基础上,通过具体工程中施工进度信息的关系利用和挖掘体现所提数据映射机制的优越性,结果表明所提数据映射机制提高了预制装配式建筑施工管理效率。     

建设城镇地籍数据库中数据质量控制的关键性

土地管理要引入第三方监理单位来监控数据库建设的数据质量。通过统一的管理、数据的采集、转换、检查来加强对数据质量的控制,确保城镇地籍数据库建设的科学性、有效性,切实提高城镇地籍数据库服务建设的作用。     

内蒙古电力创新知识平台的设计与实现

为有效管理、利用以及保护内蒙古电力(集团)有限责任公司(以下简称内蒙古电力公司)的科技文献资源,展示内蒙古电力公司科技实力,利用先进的计算机技术设计开发了内蒙古电力创新知识平台。该平台整合了内蒙古电力公司科技人员取得的科技成果、获得的专利及公开发表的科技论文,建立了功能完善的网站和管理系统,具有良好的人机对话界面以及文献利用、数据维护、网站运行等功能,实现了科技信息资源共建共享。     

基于Android的汽车驾驶行为与行驶状态远程监测系统设计与实现

随着移动互联网技术的快速发展，结合Android智能手机庞大的用户量，以及具有越来越强大的运算处理能力、支持丰富的硬件资源、简单直观的图形操作界面、方便快捷的上网等优点。为满足商用车联网对汽车驾驶行为与行驶状态的远程监测，设计并开发了基于Android的汽车驾驶行为与行驶状态远程监测系统。本系统由汽车、ELM327、Android APP、Web服务器4部分组成。汽车运行数据使用MySQL数据库进行存储，确保了数据的稳定性和安全性。以表格的形式来显示汽车运行参数及故障参数，满足了汽车驾驶人员及管理人员的远程监测。测试结果表明，该系统具有实时性好，通用性强，运行效率高等优点。     

基于DirectUi的工业组态库的设计

以D irect U i为核心,逐步分析了工业组态的框架构建过程,并分析了如何实现组态各个组件的步骤。通过该组态,可实现组态与其他软件模块的良好融合,生成原生机器码,大大提高软件运行效率。     

Speed of sound of ionic liquids: Database,estimation, and its application for thermal conductivity prediction

Speed of sound is an important thermodynamic property of ionic liquids (ILs) and always chosen as a source to determine other properties. A database for the speed of sound of pure ILs created by collecting experimental data from literature covering the period from 2005 to 2013 is presented. The effects of temperature and the alkyl chain length on the speed of sound are discussed and a second‐order corresponding states group contribution method is developed to estimate the speed of sound. An average absolute deviation (AAD) of 2.34% has been obtained. This method offers a simple but reliable approach to estimate the speed of sound of new ILs. Finally, the speed of sound is used to determine the thermal conductivity of ILs based on the Bridgman theory. The calculated values of thermal conductivity show a good agreement with the experimental ones with an AAD of 3.91%. © 2014 American Institute of Chemical Engineers AIChE J, 60: 1120–1131, 2014     

数据库垄断的成因及对策分析

学术数据库市场被少数几个出版商掌握，新的数据库商难以加入到竞争中来，因此导致了学术数据库市场的垄断问题。本文通过叙述学术数据库垄断的四个问题，即数据库定价的不合理、数据库许可权的滥用、经营者集中和数据库用户受限，提出通过开放获取、图书馆联合与立法保护来应对数据库市场的垄断问题。     

Reduced chemistries with the Quantemol database (QDB)

Typical feed gas mixtures used in technological and other plasmas may give rise to reaction networks involving several hundred reactions. Such chemistries are often too large to be used in full reactor simulations and it is therefore desirable to construct reduced chemistry networks which mimic as closely as possible the behavior of the full chemistry but employ far fewer individual reactions and species. Constructed chemistries are available from the Quantemol database (QDB) and two approaches to constructing reduced chemistry from these chemistries based on (a) physical intuition and (b) sensitivity analysis of dominant reaction pathways, are explored. In doing this it is necessary to consider different pressure and power regimes. Reduced chemistry sets are presented for CF₄ /O₂/N₂/H₂, for which 396 reactions and 52 species are reduced to 71 reactions and 26 species, and for pure O₂, for which 45 reactions and 10 species are reduced to 34 reactions.     

基于被引频次统计的基础科学数据库影响力分析

客观评价科学数据的共享和应用成效已是科学数据资源持续建设和良性发展的重要内容。数据库在学术论文中被引用和标注情况是分析其服务效果和影响力的一个重要参考指标。本文通过独立的第三方机构——同方知网学术文献总库,统计分析基础科学数据库 2009 年 10 月至 2012 年 12 月被学术论文全文引用的情况。同方知网从论文年度、论文类型、作者单位、获得资助分布和所属研究领域等五组指标对引用基础科学数据库的论文进行分析。结果显示,在过去三年多的时间内,基础科学数据库共被引用 968 次,并呈现逐年增长的趋势;文献类型涉及期刊、博硕论文、会议论文和报纸文章等;作者单位即有高等院校和科研机构,也包括政府部门和公司企业。这一结果表明基础科学数据资源已经产生了积极广泛的影响力。     

Exploring inattention and distraction in the SafetyNet Accident Causation Database

Distraction and inattention are considered to be very important and prevalent factors in the causation of road accidents. There have been many recent research studies which have attempted to understand the circumstances under which a driver becomes distracted or inattentive and how distraction/inattention can be prevented. Both factors are thought to have become more important in recent times partly due to the evolution of in-vehicle information and communication technology. This study describes a methodology that was developed to understand when factors such as distraction and inattention may have been contributors to crashes and also describes some of the consequences of distraction and inattention in terms of subsequent driver actions.