this paper studies an m/g/1 repairable queueing system with multiple vacations and n-policy, in which the service station is subject to occasional random breakdowns. when the service station breaks down, it is repaired by a repair facility. moreover, the repair facility may fail during the repair period of the service station. the failed repair facility resumes repair after completion of its re...

Regulatory entities require that for any radiation facility the surrounding areas must be restricted unless the dose equivalent is less than 0.02 mSv in any one hour. Two Monte Carlo radiation transport simulation codes, MCNP5 and Mercurad, were used to design a facility to shield a 3.48 x 10(5) MBq 137Cs irradiator that meets these requirements. Simulations showed that the dose equivalent rate...

Computer-Aided Design (CAD) is widely used during the engineering design stage of construction projects. CAD generally contains a wealth of information regarding the facility to be constructed; this information can be effectively used for construction decision-making. This paper undertakes an investigation of the possibility of using a “product-based” model representation for integrating 3D CAD...

Building information modelling (BIM) provides architectural 3D visualization and a standardized way to share and exchange building information. Recently, there has been an increasing interest in using BIM, not only for design and construction, but also the post-construction management of the built facility. With the emergence of smart built environment (SBE) technology, which embeds most spaces...

Purpose The recent research trend of building information modelling (BIM) involves interoperability and issues pertaining to the design, construction, operations, and maintenance phases of a building. However, few researchers are concerned with problems encountered in the last two phases of the building life cycle. Since BIM has been widely used in the design and construction phases, further ex...

An approach to facility design and construction software integration is described. The approach is based on a federated system architecture in which engineering applications are viewed as software agents that communicate using an expressive message-based communication standard via networked task-independent programs called facilitators. This paper discusses various aspects of this approach, des...

There is a renewed interest in immersive visualization to navigate digital data-sets associated with large building and infrastructure projects. Following work with a fully immersive visualization facility at the University, this paper details the development of a complementary mobile visualization environment. It articulates progress on the requirements for this facility; the overall design of...

The delivery of facilities which incorporate a high degree of sustainable characteristics requires extensive collaboration and coordination between many professionals early in the design process. One challenge related to the design of sustainable projects is the ability for each professional to understand the impact of one building system on the performance of the building as a whole. Advanced ...

Virtual Reality (VR) and Augmented Reality (AR) are exciting technologies that offer considerable potential benefits in all stages of the Architecture, Engineering and Construction (AEC) process, from initial planning and conceptual design to facility management and operations. VR and AR allow people to visualize and interact with a building or infrastructure design and construction process in ...