A Building Information Modeling-Life Cycle Cost Analysis Integrated Model to Enhance Decisions Related to the Selection of Construction Methods at the Conceptual Design Stage of Buildings

Life Cycle Cost Analysis (LCCA) provides a systematic approach to assess the total cost associated with owning, operating, and maintaining assets throughout their entire life. BIM empowers architects and designers to perform real-time evaluations to explore various design options. However, when integrated with LCCA, BIM provides a comprehensive economic perspective that helps stakeholders understand the long-term financial implications of design decisions. This study presents a methodology for developing a model that seamlessly integrates BIM and LCCA during the conceptual design stage of buildings. This integration allows for a comprehensive evaluation and analysis of the design process, ensuring that the development aligns with the principles of low carbon emissions by employing modular construction, 3D concrete printing methods, and different building design alternatives. The model considers the initial construction costs in addition to all the long-term operational, maintenance, and salvage values. It combines various tools and data through different modules, including energy analysis, Life Cycle Assessment (LCA), and Life Cycle Cost Analysis (LCCA) to execute a comprehensive assessment of the financial implications of a specific design option throughout the lifecycle of building projects. The development of the said model and its implementation involves the creation of a new plug-in for the BIM tool (i.e., Autodesk Revit) to enhance its functionalities and capabilities in forecasting the life-cycle costs of buildings in addition to generating associated cash flows, creating scenarios, and sensitivity analyses in an automatic manner. This model empowers designers to evaluate and justify their initial investments while designing and selecting potential construction methods for buildings, and enabling stakeholders to make informed decisions by assessing different design alternatives based on long-term financial considerations during the early stages of design.

Estimation of Building’s Life Cycle Carbon Emissions Based on Life Cycle Assessment and Building Information Modeling: A Case Study of a Hospital Building in China

Throughout the life cycle, the buildings emit a great deal of carbon dioxide into the atmosphere, which directly leads to aggravation in the greenhouse effect and becomes a severe threat to the environment and humans. Researchers have made numerous efforts to accurately calculate emissions to reduce the life cycle carbon emissions of residential buildings. Nevertheless, there are still difficulties in quickly estimating carbon emissions in the design stage without specific data. To fill this gap, the study, based on Life Cycle Assessment (LCA) and Building Information Modeling (BIM), proposed a quick method for estimating Building’s Life Cycle Carbon Emissions (BLCCE). Taking a hospital building in Chuzhou City, Anhui Province, China as an example, it tested its possibility to estimate BLCCE. The results manifested that: 1) the BLCCE of the project is 40,083.56 tCO2-eq, and the carbon emissions per square meter per year are 119.91 kgCO2-eq/(m2·y);2) the stage of construction, operational and demolition account for 7.90%, 91.31%, and 0.79% of BLCCE, respectively;3) the annual carbon emissions per square meter of hospital are apparently higher than that of villa, residence, and office building, due to larger service population, longer daily operation time, and stricter patient comfort requirements. Considering the lack of BLCCE research in Chinese hospitals, this case study will provide a valuable reference for the estimated BLCCE of hospital building.

Research on The Impact of Internal Control Quality on Accounting Information Transparency from The Perspective of Life Cycle

With the gradual change of the market, the healthy development of capital market is more and more inseparable from transparent accounting infonnation. The improvement of accounting information quality solves the problem of information asymmetry. In order to improve the transparency of accounting infonnation, over the years, China's internal control construction has been developing better and better, and has played a decisive role in corporate governance. In addition, enterprises will experience different internal control systems when facing different development states, so their structural characteristics will be completely different. The agency problem and information asymmetry will also change, and the situation of internal control will be different, which will inevitably affect the transparency of accounting information of enterprises.

Development Trend of Water Supply and Drainage Engineering Based on Life Cycle Assessment and Building Information Model

With the rapid development of construction engineering and municipal engineering in recent years, water supply and drainage technology has gradually matured. Building water supply and drainage design contains the design of rainwater drainage, sewage drainage design, water supply design and fire water supply design. At present, the research on the life cycle assessment of urban drainage system is mainly focused on the sewage treatment plant, therefore in this paper we introduce the theoretical basis of life cycle assessment. In the era of information network, building information model（BIM） technology is widely applied to the design of building water supply and drainage, which and effectively improves the design effi ciency, and makes up for the traditional water supply and drainage design of a lot of problems. In this paper, we analyze the development trend of water supply and drainage engineering based on life cycle assessment and building information model.

Facilitating IT outsourcing through improving buyer-vendor interaction in outsourcing life cycle

For a clear understanding of how to foster necessary attributes of partnerships that promote a closer relationship for achieving outsourcing success,this paper tries to explore the role of interaction.Based on empirical data from a logistics and procurement flat system outsourcing case and earlier research,the industrial network approach and the international marketing and purchasing interaction model are used to analyze the nature of interaction in a three-phased outsourcing life cycle,particularly,characteristics and activities of the transition phase are identified.The findings reveal that developing a relationship between partners requires an industrial network perspective.Improving the key aspects of interaction,information and knowledge sharing,communication and collaborative participation,involved in the important events of three phases would contribute to enhance the relationships performance.The key aspects of interaction should take place among the network actors and not just between buyers and vendors.

Net Present Value Method: A Method Recommended by ISO 15686-5 for Economic Evaluation of Building Life Cycle Costs

The publication of ISO 15686-5 is significant for studies related to the life-cycle costs of buildings. Among the many economic evaluation methods, the NPV method is recommended for use by this standard. This study explains the concept and method of PV, and then provides an explanation of the concept and method of NPV, and points out the limitations in the practical application of the method.

IFC implementation in lifecycle costing

Life Cycle Costing (LCC) is always a major concern in the Architecture, Engineering and Construction (AEC) industry. This paper presents the implementation of Building Information Modeling (BIM) technology in the development of a lifecycle cost-estimating tool. The IFC (Industry Foundation Classes) model as an interoperable building information model has been adopted as the central data repository to deliver the integrated information of building designs from CAD design systems into the lifecycle-costing database. In this paper, the conceptions and relevant factors, which could affect the LCC estimation, have been introduced. The problems of current LCC applications have been identified as the lack of LCC data and the complexity of LCC exercises. The software application of IFC models and relevant auxiliary are depicted as a solution of the problem identified. The lifecycle costing tool is a part of the nD Modeling tool and as such is based on its integrated interface prototype toolkit and is able to holistically present an IFC model into a 3D virtual reality view, a tree-view and a list of element properties. The functions and some technical points are also detailed in the paper. Through the research, it demonstrates the potential and possibility of implementing BIM methods and techniques, particularly IFCs to enhance the computer applications in the processes of building construction and facility management.

Improvement of the Life Cycle Costing Method in DesignStage Using KBIMS Library

With the advent of the fourth industrial revolution,the construction industry has undergone a paradigm shift.The smart construction technology market is expected to grow 12%annually in developed countries due to advanced technology investments.It is expected that businesses requiring highly sophisticated technology,for instance companies that need their old facilities upgraded,will become the main focus of the market.As building information modeling(BIM)design is becoming mandatory,such as in the Korea Public Procurement Service,researches regarding building automation,construction,and operation integration management systems based on BIM are conducted.In addition,for construction projects of over 10 billion won,design value engineering(Design VE)implementation,including life cycle cost(LCC)analysis,is mandatory at the design stage to improve quality and reduce the lifetime costs of buildings.In this study,we propose an improvement plan for LCC analysis at the design stage using the KBIMS library,which is an open BIM library developed by the Korean government and research groups.We analyze the existing LCC method,KBIMS library,and attribute information,and model the process that is applied in the LCC analysis system.This is expected to complement the LCC analysis system and improve work productivity.

政务大数据治理的内涵辨析与逻辑建构--基于“本体—工具—目标”的分析视角

随着技术思维发展成熟,政务大数据指涉转向信息资源层面,政务大数据治理进入资源整合阶段。政务大数据治理着眼于本体流变状态,放眼于环境交互过程,最终指向功能实现程度,是由信息生命周期、信息生态系统、信息效能评价组成的复杂系统。政务大数据治理的逻辑主线是政府部门通过组织力量、制度建设、协商过程等组织工具,调动公众需求、人力资本、技术资源等组织资源,对履行职能过程中主动采集和自动生成的海量数据资源进行开发整治。为实现政务大数据治理的高质量发展,需要在实践路径上变“技术主导”为“资源整合”,变“结果管理”为“过程管理”,变“碎片化管理”为“整体性治理”,变“运动式治理”为“常态化治理”。

Molecular Engineering Design for High-Performance Aqueous Zinc-Organic Battery

Novel small sulfur heterocyclic quinones(6a,16adihydrobenzo[b]naphtho[2′,3′:5,6][1,4]dithiino[2,3-i]thianthrene-5,7,9,14,16,18-hexaone(4S6Q)and benzo[b]naphtho[2′,3′:5,6][1,4]dithiino[2,3-i]thianthrene-5,9,14,18-tetraone(4S4Q))are developed by molecule structural design method and as cathode for aqueous zincorganic batteries.The conjugated thioether(–S–)bonds as connected units not only improve the conductivity of compounds but also inhibit their dissolution by both extendedπ-conjugated plane and constructed flexible molecular skeleton.Hence,the Zn//4S6Q and Zn//4S4Q batteries exhibit satisfactory electrochemical performance based on 3.5 mol L-1(M)Zn(ClO4)2electrolyte.For instance,the Zn//4S6Q battery obtains 240 and 208.6 mAh g^(-1)of discharge capacity at 150 mA g^(-1)and 30 A g^(-1),respectively.The excellent rate capability is ascribed to the fast reaction kinetics.This system displays a superlong life of 20,000 cycles with no capacity fading at 3 A g^(-1).Additionally,the H+-storage mechanism of the 4S6Q compound is demonstrated by ex situ analyses and density functional theory calculations.Impressively,the battery can normally work at-60℃benefiting from the anti-freezing electrolyte and maintain a high discharge capacity of 201.7 mAh g^(-1),which is 86.2%of discharge capacity at 25℃.The cutting-edge electrochemical performances of these novel compounds make them alternative electrode materials for Zn-organic batteries.

Building Information Modeling for Environmental Impact Assessment in Early Design Phases: A Literature Review

The building sector is the largest consumer of energy in industrial countries. Saving energy in new buildings or building renovations can thus lead to significant global environmental impacts. In this endeavor, building information modeling (BIM) and building energy modeling (BEM) are two important tools to make the transition to net-zero energy buildings (NZEB). So far, little attention has been devoted, in the literature, to discuss the connection between BIM, BEM, and Life-cycle assessment (LCA), which is the main topic of this article. A literature review of 157 journal articles and conference proceedings published between 1990 and 2020 is presented. This review outlines knowledge gaps concerning BIM, BEM, and environmental impact assessment. It suggests that defining the process with the right technology (at the right time) would result in a more integrated design process (IDP) and bridge current gaps. The most efficient way to improve process and technology is related to the competences of the architects, engineers and constructors (AEC). The review also indicates that the IDP in the early design phases (EDP) is in need of improvement for architects and engineers, where a better connection between design phases, specific levels of development (LOD) and BIM tools is needed. Competences, process and technology are the three main themes addressed in the review. Their relation to design phases and LOD is discussed. The aim is to propose possible solutions to the current hinders in BIM-to-BEM (BIM2BEM) and BIM-for-LCA (BIM4LCA) integration.

Evaluating Security of Big Data Through Fuzzy Based Decision-Making Technique

In recent years,it has been observed that the disclosure of information increases the risk of terrorism.Without restricting the accessibility of information,providing security is difficult.So,there is a demand for time tofill the gap between security and accessibility of information.In fact,security tools should be usable for improving the security as well as the accessibility of information.Though security and accessibility are not directly influenced,some of their factors are indirectly influenced by each other.Attributes play an important role in bridging the gap between security and accessibility.In this paper,we identify the key attributes of accessibility and security that impact directly and indirectly on each other,such as confidentiality,integrity,availability,and severity.The significance of every attribute on the basis of obtained weight is important for its effect on security during the big data security life cycle process.To calculate the proposed work,researchers utilised the Fuzzy Analytic Hierarchy Process(Fuzzy AHP).Thefindings show that the Fuzzy AHP is a very accurate mechanism for determining the best security solution in a real-time healthcare context.The study also looks at the rapidly evolving security technologies in healthcare that could help improve healthcare services and the future prospects in this area.

Research of Home Information Technology Adoption Model

The Information Technology at Home has caught the attention of various industries such as IT,Home Appliances,Communication,and Real Estate.Based on the information technology acceptance theories and family consumption behaviors theories,this study summarized and analyzed four key belief variables i.e.Perceived Value,Perceived Risk,Perceived Cost and Perceived Ease of Use,which influence the acceptance of home information technology.The study also summaries three groups of external variables.They are social,industrial,and family influence factors.The social influence factors include Subjective Norm;the industry factors include the Unification of Home Information Technological Standards,the Perfection of Home Information Industry Value Chain,and the Competitiveness of Home Information Industry;and the family factors include Family Income,Family Life Cycle and Family Educational Level.The study discusses the relationship among these external variables and cognitive variables.The study provides Home Information Technology Acceptance Model based on the Technology Acceptance Model and the characteristics of home information technology consumption.

湖南传统花鼓戏教学档案数字资源体系开发利用研究--基于档案信息资源建设生命周期理论

湖南传统花鼓戏教学档案数字资源体系在传承优秀传统文化、培养专业人才等方面具有重要实践价值,但目前这一体系还存在开发设计不够、加工进程滞后、相关制度跟进不及时等问题。本研究基于档案信息资源建设生命周期的设计、选择、形成、发布、维护五个阶段,提出推进湖南传统花鼓戏教学档案数字资源体系建设和利用的对策,助力湖湘特色戏曲发展,传承弘扬湖湘文化。

机场智慧跑道的内涵拓展与功能系统

传统采用人工巡检、经验决策的机场跑道管控模式,难以适应现代机场高性能服役、高安全运行的现实需求。随着传感器、物联网、人工智能等新兴技术的发展,以及民航强国战略实施和“四型机场”加速推进的引领下,融合道面运行管理和在线感知的智慧跑道,已逐渐成为前沿科技和重大战略的交汇点,是机场跑道未来的发展趋势和热点。文章提出了智慧跑道的内涵和特征,明晰智慧跑道相对智能跑道的继承与拓展关系,在结构安全、运行安全与维护决策方面将智慧跑道功能具化为风险实时预警、性能在线评估、诱因精准分析、态势精准预测、养护智能决策五大功能,并结合机场跑道系统动力学思想阐述其实现路径。系统平台作为智慧跑道的载体,面向于实际应用在智能跑道基础上重点融合在线感知模块与日常巡检、维修等业务模块,搭建基于二、三维地图联动的智慧跑道全寿命周期管理平台,并依托高高原地区的日喀则定日机场和极寒地区的漠河古莲机场,实施机场智慧跑道的应用示范。

高管激励调整、会计信息质量与公司股价崩盘风险

高管作为企业运营的核心主体,其薪酬激励方式的选择与调整是决定公司风险防控和未来发展的关键因素。以2007—2020年中国沪深A股上市公司为研究对象,实证检验了高管激励调整对公司股价崩盘风险的影响及作用机制。研究发现,高管激励调整、高管激励方式由现金调整为股票期权、高管激励调整次数上升均能够显著降低上市公司股价崩盘风险,且会计信息质量在高管激励调整对公司股价崩盘风险的影响中发挥了部分中介效应。异质性分析表明,高管激励调整对股价崩盘风险的缓解效应仅显著存在于处于成长期或成熟期(而非衰退期)以及分析师关注度较高的企业中。因此,企业应建立相对灵活的薪酬激励长效机制,根据不同生命周期设计合理的奖惩制度,并适度调整契约条款,进而防范公司股价崩盘风险。

地质信息采集系统在工程全周期的应用研究

为了解决工程勘测管理全生命周期中外业采集数据覆盖不全的问题,通过将钻孔APP、平洞APP、边坡编录APP、洞室编录APP等多种现场采集方式进行集成,开发了一套高效的地质信息采集系统,并在云平台实现了数据的实时上传与共享。应用结果表明:该系统不仅实现了快速建模、数据统计和二维出图等核心功能,还提升了数据的分析存储与管理效率,有效解决了户外数据采集与输入的难题,可使勘察设计企业在工程的前期规划、施工阶段及运维等实现工程的全生命周期管理,为地质风险预测和设计优化提供支持。

科研人员科学数据元数据功能需求探索

在数据共享和开放科学建设的背景下,通过科研人员对数据资源的需求,分析科学数据元数据的功能需求,以期为我国科学数据元数据标准建设和完善提供参考。通过半结构化访谈,收集30位科研人员研究过程中的科学数据元数据功能需求,并根据信息行为理论构建科研人员科学数据元数据功能需求模型。研究结果表明,科研人员科学数据元数据功能需求受个体价值感知和学科差异影响明显,并在科学数据的交流和共享过程中体现出来。本文从科研人员需求、信息行为过程和数据生命周期理论3个角度为科学数据元数据建设提出启示和建议。

基于BIM的超高层地标综合体全生命周期建设

结合青岛海天中心项目,分阶段详细阐述BIM技术在超高层地标综合体全生命周期建设中的应用。在规划阶段建立各项BIM标准及组织制度,在设计阶段通过仿真模拟分析、BIM全专业模型深化,有效解决超高层综合体业态多、设计标准高,导致机电系统及管线布置错综复杂等问题,并实现设计施工信息传递。施工阶段基于BIM专业深化、三维激光扫描等应用,为异形外立面、钢结构和装配式机房等提供保障施工精度和进度的方法,并通过施工协同平台紧密结合虚拟建造与实体工程。在运维阶段搭建运维平台,实现提高运行管理效率、降低运维成本、提升建筑性能三位一体的目标。通过全生命周期BIM应用,实现全生命周期信息有效传递,为工程提质增效。

考虑道路交通信息的双源无轨电车与电动公交车协同优化

随着双源无轨电车在城市电动公交领域展现出高效的服务能力,交通网与电网的耦合进一步加深。考虑到双源无轨电车短期内无法完全取代电动公交车,为有效调度两种车型,解决当前城市公交系统生命周期成本高、车辆配置数量多的问题,对双源无轨电车与电动公交车的配置与调度进行联合建模。首先,搭建交通网-电网耦合的城市公交系统运行框架,并考虑道路交通信息建立城市公交的速度模型。然后,分析不同类型公交车的运营模式,综合考虑公交车能耗差异与分时电价,精细化运营成本建模,建立以生命周期成本最小化为目标的城市公交系统生命周期成本模型,并采用遗传算法对模型进行求解。最后,采用中国上海市公共交通现有双源无轨电车路线的数据进行仿真验证。结果表明,所提精细化模型可以在完成既定行程表的情况下,减少车辆配置数量,降低生命周期成本,满足不同规模混合公交车队的合理配置与调度优化。