Image-based 3D scene reconstruction and exploration in augmented reality

Augmented Reality (AR) is an integrated technique of image processing and display system of complex information, which involves real-time computing, motion tracking, pattern recognition, image projection, database linking, feature extraction, and coordinate transformation. In this study, such techniques through Structure From Motion (SFM), Clustering Views for Multi-View Stereo (CMVS), Patch-based Multi-View Stereo (PMVS), and Poisson surface reconstruction were smoothly integrated into a 3D reconstruction system with comparative efficiency in computation. The system can be applied to regular images taken by amateur cameras, smart phones, tablet PCs, and other mobile devices, without need of a priori internal and external camera parameters. To verify the ability of the established reconstruction system, indoor and outdoor objects at various scales, such as a helmet (a small object), a corridor (an indoor medium object), an arbor (outdoor medium object), and a building (outdoor large object) were tested. Through tracking and registration, the reconstructed 3D models were loaded in an AR environment to facilitate displaying, interacting, and rendering that provides AR applications in construction design and management for better and qualitative communication in economical and handy ways.     

Managing construction information using RFID-based semantic contexts

Quick and correct information capturing, archival and retrieval in construction sites is essential to support project management. This paper presents a new methodology for managing construction document information using RFID-based semantic contexts. The methodology deploys four main tools for construction document archival and retrieval: (1) template document metadata modules that formulate document information; (2) semantic ontologies for indexing construction documents; (3) RFID framework for automatic identification of construction concepts; and (4) an ontological indexing mechanism to reason about ontological semantic relationships and infer applicable concepts for indexing. To demonstrate the role and contribution of the new proposed methodology, first a template for construction problem documents module has been constructed. Then, a new object-oriented Java-based prototype was developed to leverage RFIDs and OWL (Web Ontology Language)-based ontologies for reasoning about indexed construction concepts. Finally, a case study has been performed to validate the new methodology's capability of supporting users through available RFID information in the selection of construction concepts for archiving and retrieving related, stored documents from a relational corporate database of construction problems. The new methodology implementation shows a number of direct impacts such as the effectiveness of document archival and retrieval and the efficiency of fusing information. The new methodology is described in the paper, including findings obtained from the case study and a discussion of future research.     

Image-based 3D reconstruction using traditional and UAV datasets for analysis of road pavement distress

On local and urban networks, the enduring issue of scarce resources for Maintenance, Rehabilitation, and Reconstruction strategies (MR&R) has led, in many cases, to using unadjusted or poor techniques for road pavement distress detection and analysis, yielding ineffective or even counterproductive results. Therefore, it is necessary to have tools that can carry out quick, reliable and low-cost assessment surveys. This paper aims at validating the use of innovative and low-cost technologies for road pavement analysis, assessing their potentialities for improving the automation and reliability of distress detection. A Structure from Motion (SfM) technique is analyzed at different altitudes. The technique was applied on a distressed road pavement inside the University Campus in Palermo. The models obtained were compared with a terrestrial laser scanned 3D model to analyze the technique's metric accuracy and reliability. The results have shown that the technique accurately replicates pavement distresses, inciting an integrated approach to optimize pavement management strategies.     

恒山隧道改建工程施工中的体会

以恒山隧道改建工程施工为例，针对其地理及工程地质条件，介绍了其隧道掘进与初期支护施工的措施，并进一步提出了二次衬砌与路面施工措施，经改造解决了通风照明问题。     

A semantic framework to support corporate memory management in building construction

Corporate memory tools represent one way organizations can document, retrieve and utilize best practice and lessons learned in enhancing their performance. Using semantic systems in building these tools (along with database and/or AI-based systems) allows for more efficient representation of tacit knowledge. Such systems are based on a common ontology of the subject domain, where entities (such as actors, processes and products) are interlinked to represent the essence of the knowledge in the domain. The paper presents a taxonomy for building construction. The taxonomy includes 6000 concepts and was developed using OWL. It maps to existing classification systems to assure better coverage. The taxonomy is the first attempt to present building construction knowledge in a semantic way. It also represents the foundations developing ontology-based corporate memory systems. To demonstrate the role and contribution of the proposed taxonomy a prototypical ontology for building construction was developed. Furthermore, a framework for agent-based system for supporting semi-automatic generation of reports such as lessons learned, work forms, and meeting agendas. Such agents allow organizations to capture and document its knowledge (in a taxonomy-complaint format) and to feed back post-project knowledge into new ones through access to lessons learned and through pre-defined meeting agendas. Access to these reports is done through semantic search according to the proposed taxonomy. Future research will develop a formal ontology and further develop the framework and implement it in actual organizations.     

沉沙池改造坡面混凝土现浇滑模施工技术

根据滑模施工的条件以及装置的技术改进设计,介绍了滑模现浇混凝土的施工工艺及关键环节的施工控制,总结了该技术的应用情况,指出这是一种先进可行且经济实用的技术.     

一种既有建筑节能改造的方案及施工方法

通过对山东科技大学住宅区建筑外墙节能改造实例,提出一种既有建筑外墙节能改造方案和保温体系的具体施工方法,以消除房间内墙结露、发霉现象,达到节能降耗的目的。     

代建制在灾后重建工作中的应用

从代建制的概念入手,分析了灾后重建项目应用代建制的必然性,并提出了代建制的应用所面临的问题,最后对代建制在灾后重建中的应用提出了一些意见、建议,以指导代建制在灾区重建工作中发挥应有的作用。     

An ontology-based approach for formalisation and semantic organisation of conformance requirements in construction

This paper presents an ontology-based method for the formalisation and application of construction conformance requirements for effective code checking. This research continues our work on the development of a generic model automating the conformance checking of construction projects against building codes. We start from the analysis of the related research on the formalisation and organisation of building codes that allows us to formulate our approach for semantic annotation and scheduling of conformance requirements for conformance checking task. Our approach comprises 5 main steps: formalisation, semantic annotation, classification, context-based scheduling and semantic search of conformance requirements. They are implemented as corresponding key components of the C3R (Conformance Checking in Construction — Reasoning) prototype that we have developed to model the conformance checking process in construction. Finally, we discuss the ongoing work and perspectives of our research: the validation of our model by construction practices and the enrichment of our approach by usage-based knowledge.     

大口径输水管线迁改设计及施工

结合重庆高新区某道路建设涉及的输水管道迁改工程实例,介绍了管线迁改设计的原则,主要从沟槽开挖与管道安装两方面,阐述了管道迁改施工的技术要点,以确保迁改后输水管道的正常运行。     

浅谈公路改建工程施工中重点控制的要素

针对公路改建工程施工过程中的干扰因素和安全隐患,对公路改建工程施工应控制的质量、进度、资金、环保、安全重点环节进行了探讨,介绍了公路改建工程施工重点控制的要素,以期指导实践。     

浅议王庄矿集中供热改造及实施

对王庄矿中小型燃煤锅炉污染提出了综合治理对策,通过淘汰小型锅炉,采用大吨位锅炉集中供热,引进高效烟气除尘技术,从而简便、经济、有效地控制了中小型燃煤锅炉排放烟尘和SO2,以减少烟尘及SO2对王庄矿及周边大气环境的污染。     

建筑物改造工程中结构设计及施工方案的确定

从是否需要抗震加固、水暖电的改造、建筑使用功能三方面介绍了确定结构设计方案需要考虑的问题，阐明了施工方案的确定方法，以期能为改造工程设计提供借鉴。     

Geotechnical basis of complex procedures for reconstruction and new construction

Characteristic features of the performance of weak clayey soils in the beds of reconstructed or new buildings are addressed. A variety of nonlinearly elastic models are proposed for the deformation of weak clayey soils. The influence exerted by various foundation-engineering procedures on the soil mass and existing buildings is analyzed numerically. Translated from Osnovaniya, Fundamenty i Mekhanika Gruntov, No. 3, pp. 3–8, May–June, 1997.     

既有线电化改造信号施工管理

结合实际情况,针对既有线电化改造信号施工管理进行了简要论述,就电化改造施工中信号负责人的工作重点作了归纳,同时提出一些管理对策,以期保证现场施工安全及既有线行车安全。     

接触网过渡改造施工分析

结合工程实际,对朔黄铁路扩能改造电气化工程接触网过渡改造原则、改造方案、改造施工保证措施进行了充分的说明,列举了接触网过渡改造方法,对解决接触网改造中的实际问题和丰富接触网施工管理经验,提高施工效率有一定的意义。     

铁路站场改造施工过渡方案优化探讨

以通霍线白音胡硕站场改造工程为例,提出施工封锁过渡方案,并从保安全、保质量、保工期等方面对各个方案进行了研究、讨论,对施工过渡方案进行优化,使得施工不影响运输,既满足了施工要求,又满足了运输要求,顺利完成了施工任务。     

灾后重建工程项目代建管理经验探讨

结合四川省灾后恢复重建工程,重点讲述了在高原施工过程中如何实施代建管理,从质量控制、安全管理、费用控制等各方面进行了探讨,以期为同类行业提供一些经验。     

论太原市城市建设中的棚户区改造

介绍了棚户区的定义与形成原因,结合太原市棚户区的现状特点,论述了棚户区改造运作模式,探讨了棚户区居民的安置方式与保障措施,以改善城市形象,加快城市发展。     

谈高速公路改扩建加宽方式

针对如何选择最佳的高速公路改扩建加宽方式的问题,介绍了主要的改扩建加宽方式,以列表形式对主要加宽方式的控制性因素进行了对比分析,并结合工程实例进行了探讨,具有一定的现实指导意义。