Buildings are among the largest consumers of electricity in the US. A significant portion of this energy use in buildings can be attributed to HVAC systems used to maintain comfort for occupants. In most cases these building HVAC systems run on fixed schedules and do not employ any fine grained control based on detailed occupancy information. In this paper we present the design and implementation of a presence sensor platform that can be used for accurate occupancy detection at the level of individual offices. Our presence sensor is low-cost, wireless, and incrementally deployable within existing buildings. Using a pilot deployment of our system across ten offices over a two week period we identify significant opportunities for energy savings due to periods of vacancy. Our energy measurements show that our presence node has an estimated battery lifetime of over five years, while detecting occupancy accurately. Furthermore, using a building simulation framework and the occupancy information from our testbed, we show potential energy savings from 10% to 15% using our system.

[ACM Press the 2nd ACM Workshop - Zurich, Switzerland (2010.11.02-2010.11.02)] Proceedings of the 2nd ACM Workshop on Embedded Sensing Systems for Energy-Efficiency in Building - BuildSys \'10 - Occupancy-driven energy management for smart building automation

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Applied Multivariate Techniques

El artículo tiene como objetivo evaluar el nivel de desarrollo de la capacidad de absorción realizada (RACAP) en las Pyme colombianas. Se parte de una muestra de 363 Pyme colombianas (Dane,2012), se usa una revisión de literatura con apoyo del análisis de contenido y un modelo de regresión lineal, que permiten mostrar la existencia de una correlación lineal positiva entre la adquisición y asimilación del conocimiento externo en las organizaciones objeto de estudio,. Palabras clave: Capacidades de absorción, capacidades de absorción potencial, medición de las capacidades de absorción ABSTRACT:

Measurement of potential absorption capacity in Colombia's innovative companies [Medición de la capacidad de absorción potencial en las empresas innovadoras de Colombia]

Contractor selection is one of the main activities of clients. Without a proper and accurate method for selecting the most appropriate contractor, the performance of the project will be affected. The multi-criteria decisionmaking (MCDM) is suggested to be a viable method for contractor selection. The analytic hierarchy process (AHP) has been used as a tool for MCDM. However, AHP can only be employed in hierarchical decision
models. For complicated decision problems, the analytic network process (ANP) is highly recommended since ANP allows interdependent influences specified in the model. An example is demonstrated to illustrate how this method is conducted, including the formation of supermatrix and the limit matrix.

Contractor selection using the analytic network process

Proceedings of the 32nd Annual ARCOM Conference, 5-7 September 2016, Manchester. UK, Association of Researchers in Construction Management

Sustainability concepts are adopted via new technologies to achieve the highest gains without compromising the projects' objectives. One of these technologies is radio frequency identification (RFID). This research investigated the influence of various drivers and benefits of RFID implementation on the achievement of sustainable construction projects. A close-ended questionnaire detailing the necessary variables were administered to relevant construction professionals in the study area. Results of exploratory factor analysis of the data revealed that the drivers of RFID could be grouped into three primary constructs: technology, industry, and culture. However, the benefits of implementing RFID have two primary constructs: resources and environment. This study employed a partial least square structural equation modeling to further evaluate the connections among drivers and the application of RFID in the building industry. Results indicated that implementing RFID in the building industry will aid the sustainability of construction projects. The findings of this study will assist policy makers concerned with the performance and sustainability of construction projects through the adoption of available technologies including RFID. 

Radio frequency identification implementation model for sustainable development: A structural equation modeling approach

The advent of digitalization has brought many benefits to all sectors of the economy, including construction. When fully implemented, various Fourth Industrial Revolution (4IR) tools have the potential not only to improve project planning and execution, but also to enhance project performance. This study therefore investigated the critical factors for the adoption of 4IR technologies in the construction industry, with the aim of promoting sustainable construction project delivery. The study was conducted using a questionnaire sent to experts in the construction industry. The data collected were analyzed using exploratory factor analysis (EFA) and categorized into operational, management, and demographic variables. Partial Least Square Structural Equation Modeling (PLS-SEM) was used for model development using the four groups of data. In this way, variables that were not significant to the model were identified. Judging from the analysis, there is a need for proper user training in engineering tools in the construction industry. This is one of the drivers of the adoption of 4IR in the construction industry. In addition, the professionals, contractors, authorities, and other stakeholders responsible for managing projects in the architecture, engineering, construction, and operations (AECO) industry should ensure effective coordination and collaboration between participants in the construction industry.

/pdf/exploring-the-4ir-drivers-for-sustainable-residential-i6gysaki.pdf

Exploring the 4IR Drivers for Sustainable Residential Building Delivery from Social Work Residential Perspective—A Structural Equation Modelling Approach

In the past decade, value management (VM) has become an established practice using widely known techniques and practices. VM is also exposed to demand of time and resources. Nevertheless, the actions/methods of this approach are linked to informal approaches in developing countries. However, previous research has suggested that many VM activities and elements for delivering VM in construction projects. This research aims to verify these activities through qualitative thematic analysis approach. The thematic analysis confirms the necessity of the VM activities identified in the previous research for managing construction investment and provides directions for construction organisations to improve VM adoption. The study also revealed five (5) phases of value management activities/methods for the Egyptian construction industry, including information, function, innovation, evaluation and development and presentation phases. The findings will support and improve the implementation of VM applications in Egypt's Therefore, the results reflect the need to adopt the method in line with the formal VM approach in Egypt and other developing countries.

Value Management Activities in Building Projects in Developing Countries

Risk contingency plan in a construction project allows for flexibility and effective responses to change orders and unforeseen risks arising at the construction phase of projects. A poor risk contingency allowance can result in cost overrun on a project as well as time overrun. However, a good risk contingency plan can be tailored based on the previous similar projects while taking into consideration the individuality of that particular project. The aim of the study is to review risk contingency planning for construction projects. Secondary data was used in carrying out this research study. Extant literatures were reviewed carefully for proper understanding of the methods used in carrying out risk contingency estimation, the importance of risk contingency to construction projects, the categories of risk contingency plans and the factors affecting the accuracy of risk contingency for construction projects. The study revealed and concluded that risk contingency serves as the extra budget that caters for uncertainties which can lead to cost overrun on construction projects thereby affecting the accuracy of the preliminary estimate. It was recommended that risk evaluation must be done appropriately at the planning phase of the construction project, so that the estimator can have more information necessary to factor into the estimation process thereby increasing the accuracy of the estimate prepared.

https://iopscience.iop.org/article/10.1088/1757-899X/640/1/012019/pdf

Ayodeji Emmanuel Oke

Papers

Radio frequency identification implementation model for sustainable development: A structural equation modeling approach

Exploring the 4IR Drivers for Sustainable Residential Building Delivery from Social Work Residential Perspective—A Structural Equation Modelling Approach

Value Management Activities in Building Projects in Developing Countries

Appraisal of risk contingency planning for construction projects

Construction Supply Chain Management in the Fourth Industrial Revolution Era