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

Purpose




The paper determined the possible drivers of Value Management (VM) in the construction industry with a view of providing better quality construction and achieving value for money through its usage. 




Design/methodology/approach




The study adopted a survey design and construction professionals were conveniently sampled from various strata in the six geo-political zones in Nigeria through the use of a structured questionnaire. Frequency, percentage, mean score and one-samples t-test were used in analysing the data gathered.




Findings




Result revealed that while the level of knowledge of VM practice is high, the level of its adoption in the industry is on the average, and the involvement of construction professionals in VM workshops is low. The drivers that can aid its adoption are; government involvement through the introduction of VM policy, client’s commitment, and proper understanding of VM methodology.




Practical implications




This research was conducted across the six geo-political zones of the country as against common practice of selecting a particular region or states to represent the entire country. The findings therefore show a true reflection of the drivers of VM in the country and its recommendations can to a large extent increase the use of VM in the country and also other developing countries where construction projects are executed through similar method, style and approach.




Originality/value




The paper highlights the possible ways of increasing the use of VM in the construction industry with a view to achieving better quality construction and value for money.

Drivers of value management in the Nigerian construction industry

Drivers of Value Management Implementation in Building Projects in Developing Countries

Purpose




There are several types of accommodation available to students of higher education institutions, and it is the responsibility of the institutions to focus on factors that can attract and retain students to their residences. This study aims to investigate satisfaction of higher institutions students with on-campus accommodation with an emphasis on the ethnicity of the students.




Design/methodology/approach




Using convenience sampling method, questionnaires were administered to students of selected residences in the study area. Mean item score was used to rank identified factors, whereas mean gap and Kruskal–Wallis K-test were adopted to examine the difference in opinion of students from various ethnic groups.




Findings




Overall, major features that make students dissatisfied with university-owned accommodations are enforcement of rule that compels all students to move out with their belongings during each recess, the effectiveness of the lift system, the size of wardrobe and closet, laundry service in the residence, numbers of electrical sockets and window quality. Considering dwelling unit features, neighbourhood, environmental, building quality and services provided by residence management, this study reveals that there is a significant difference in the satisfaction of students of diverse ethnic groups with their accommodation.




Research limitations/implications




The study was limited to on-campus residences owned by higher education institutions in South Africa. However, the findings of the study can be adopted for off-campus residences, and such owned by private individuals, agencies and other bodies provided are approved by the institutions.




Originality/value




The findings of this study will help management of higher education institutions to improve quality of services in their residences for the satisfaction of their students. Developers, contractors and other stakeholders involved in construction of these residences will also find the findings useful in designing and construction of the facilities.

Students’ satisfaction with hostel accommodations in higher education institutions

This purpose of the study is to evaluate areas of application of internet of things (IoT) in the construction industry, with the view of increasing the level of usage of technology. This will help in understanding the areas where IoT can be applied in the construction industry for better improvement.,A quantitative approach was adopted for this study, and the adopted questionnaire was structured on a five-point Likert scale to elicit the opinion of respondents in the areas of application of IoT in the construction industry. The respondents included are quantity surveyors, land surveyors, builders, architects and engineers. Bar chart, mean item score, one sample t-test and Kruskal–Wallis H test were used in analyzing the retrieved data.,The results showed that building information modeling, construction management, remote usage monitoring, equipment services and repair, construction tools and equipment tracking are areas where IoT is mostly applied in the industry. Site monitoring is the only factor that has significant difference in the opinions of professionals, while others do not have. One sample t-test revealed that three factors out of 12 do not have significance attached by professionals.,The study gives insight into different areas where IoT can be applied in the construction industry. It also highlights how its application can be improved through workshops, training, seminar and conference for construction professionals to keep themselves abreast of information and communication technology trends, especially in the aspect of IoT. The IoT adoption helps in accomplishing sustainable infrastructural projects with more convenience.

Ayodeji Emmanuel Oke

Papers

Drivers of value management in the Nigerian construction industry

Drivers of Value Management Implementation in Building Projects in Developing Countries

Students’ satisfaction with hostel accommodations in higher education institutions

Evaluation of internet of things (IoT) application areas for sustainable construction

Energy Savings and Sustainable Construction: Examining the Advantages of Nanotechnology