Prediction of the Delay in the Portfolio Construction Using Naïve Bayesian Classification Algorithms

Projects suspensions are between the most insistent tasks confronted by the construction field accredited to the sector’s difficulty and its essential delay risk foundations’ interdependence. Machine learning provides a perfect group of techniques, which can attack those complex systems. The study aimed to recognize and progress a wellorganized predictive data tool to examine and learn from delay sources depend on preceding data of construction projects by using decision trees and naïve Bayesian classification algorithms. An intensive review of available data has been conducted to explore the real reasons and causes of construction project delays. The results show that the postponement of delay of interim payments is at the forefront of delay factors caused by the employer’s decision. Even the least one is to leave the job site caused by the contractor’s second part of the contract, the repeated unjustified stopping of the work at the site, without permission or notice from the client’s representatives. The developed model was applied to about 97 projects and used as a prediction model. The decision tree model shows higher accuracy in the prediction.

Wireless Control Modelling for Overhead Crane

Radio frequency (RF) remote controllers are widely used in manufacturing, construction, transportation, and many other industrial applications. Cranes, drills, and miners, among others, are commonly equipped with RF remotes. Installation wired communication takes a long time to set up the connection as compared to the wireless connection. The installation becomes very lengthy and complex if we want to get connected with each router. For the same reason, for a system expansion to add more device(s), the re-routing process to connect this new device(s) to the network can be avoided. Instead, with the wireless connection, we don’t have to perform all the setup again. The network can be accessed with the authorized passcode. Radio-controlled devices are ubiquitous in all sorts of industries. In fact, many cranes are now being equipped with radio-controlled technology, which is revolutionizing the way crews move materials around a warehouse or job site. In the steel manufacturing industries, the wireless crane control has proven to assure. more advantage compared to the disadvantage. Through the surveillance and monitoring of wireless remote control for crane that done at AJSB, Prai, Malaysia.

Experimental Study of the Effect of Curing Mode on Concreting in Hot Weather

Most developing countries have hot climate, ordinary jobsites characterized by reduced of human resources, equipment and infrastructures. The objective of this article is to make an experimental study of the influence of the hot climate such as that of Algeria, on the different properties of concrete in the fresh state, such as excessive water evaporation from the concrete surface, increased demand for water, increased slump loss corresponding to additional water on job-site, higher plastic shrinkage cracking and difficulty in controlling air content. At the hardened state, we could mention a reduction of strength at 28 days, decreased durability resulting from cracking at long-term period. To show the problems linked to concreting under these conditions and to present the appropriate solutions concrete or mortar can withstand the conditions in which it is implemented. Thus, negative effects caused principally by hot weather concreting motivated the choice of the such study. The research experimental work conditions in which the cementitious matrix was kept concerned two different environments, namely hot and dry climate conditions (t = 40°, h = 0%) alike the climate of the region of M'sila., and that of a medium with a hot and humid environment (t = 40°, h = 100%). The output of the investigation demonstrated the crucial role of the cure method in hot regions. The comparison of results for a reference concrete kept in air without any curing measures with two curing types simulating hot weather environment of the region M’sila was undertaken. These obtained outcome results were discussed based on the influence of climatic conditions to conclude procedures for hot weather concreting and suitable cure methods.

A Conceptual Model of Multi-Spectra Perceptions for Enhancing the Safety Climate in Construction Workplaces

Construction safety climates can reflect organizational safety behavior and commitment, employees’ safety perceptions and attitudes, and the supervisory and support environments. Maintaining a healthy safety climate can help prevent workers from fatal accidents and illnesses. To enhance the safety climate and, consequently, improve safety performance at a construction site, it is very important to analyze the elements that affect the safety climate and are significant for different types of construction work organizations. Therefore, the main goal of this study was to develop a multi-spectra perception model to investigate which factors were considered critical from four key perspectives: managers, superintendents, skilled laborers, and general helpers. To achieve this goal, a survey questionnaire was conducted to collect empirical data from one commercial building construction project. Based on a stepwise regression analysis, it was revealed that the most significant factors enhancing the safety climate are: from the managers’ perspective, a combination of improvement in the support environment and reduction in work pressure; for superintendents and skilled laborers, increasing worker competence; and for general laborers, increasing worker involvement. This research contributes to a better understanding of the significant factors and provides a measure for each important role in enhancing the safety climate at a job site.

Evaluating 4D-BIM and VR for Effective Safety Communication and Training: A Case Study of Multilingual Construction Job-Site Crew

Effective safety management is a key aspect of managing construction projects. Current safety management practices are heavily document-oriented that rely on historical data to identify potential hazards at a construction job site. Such document-bound safety practices are prone to interpretative and communication errors in multilingual construction environments, such as in the United Arab Emirates (UAE). Applications of Building Information Models (BIM) and Virtual Reality (VR) are claimed to improve hazards identification and communication in comparison to 2-D static drawings by simulating job-site conditions and safety implications and thus can interactively educate the job-site crew to enhance their understanding of the on-site conditions and safety requirements. This paper presents findings of a case study conducted to evaluate the effectiveness of 4-Dimensional (4-D) BIM and VR in simulating job-site safety instructions for a multilingual construction crew at a project in the UAE. 4-D BIM-enabled VR simulations, in lieu of the Abu Dhabi Occupational Safety and Health Center (OSHAD) code of practice, were developed and tested through risk assessment and safety training exercises for the job-site crew. The results showed a significant improvement in the job-site crew’s ability to recognize a hazard, understand safety protocols, and incorporate proactive risk response in mitigating the hazards. This study concludes that 4-D BIM-enabled VR visualization can improve information flow and knowledge exchange in a multilingual environment where jobsite crew do not speak a common language and cannot understand written safety instructions, manuals, and documents in any common language due to linguistic diversity. The findings of this study are useful in communicating safety instructions, and safety training, in the UAE, as well as in international projects.

FIELD TRIPS: CONSTRUCTION CLASSROOMS WITHOUT ROOF

Higher education embraces outside-classroom activities such as internships, community services, and site visits. These activities bring real-world experiences into classrooms and blend them with educational content and provide a rich learning environment. Construction job site visits provide students with exposure to different types of construction projects and provide the opportunity of observing construction methods, materials, components, and crews. The Building Construction Science (BCS) program at Mississippi State University program provides students with an interactive project-based learning environment in which students utilize the additional amount of class time to experiment, collaborate, and learn. Eight studios are the core courses of the BCS program and cover the main construction subject areas. Due to the nature of studio work, students are more involved in a “learning by doing” paradigm. One of the main curriculum components of studios is out-of-state field trips, which take place at every level of the program for about one week per academic year. To evaluate the effectiveness, strengths, and challenges of field trips, a quantitative research method was used to explore students’ impressions and feedback. The results indicate field trips play a significant role in students’ learning and connect their theoretical knowledge with real-world practices. Potential benefits, optimal conditions, and challenges pertaining to the construction field trips are explored and discussed to help future job site visit planning.

Multi-Faceted Ergonomics Assessment in Medical Device Manufacturing: A Case Study

Background: According to the National Safety Council and the Bureau of Labor Statistics there were over 4,000 preventable injury related deaths. The Occupational Health and Safety Administration emphasizes that safety cultures should consist of shared beliefs, practices, and attitudes that exist at an establishment. The purpose of this industry-sponsored research project was to assist a medical manufacturing facility with safety program OSHA compliance. Method: Job Safety Analysis (JSA), also ca lled job hazard analysis, and facility inspections were used to identify hazards focused on the worker, task, tools, and the work environment. Results: Areas with high hazard scores according to the JSA were a ssigned to supervisors and the research team to provide immediate process and environment changes. Conclusion: JSA is a great tool to identify safety hazards on a job site though job functions. This will prevent injuries and a llow even small companies to remain compliant with federal regulations. Creating an atmosphere from top to bottom with a culture of safety responsibility andownership can promote a safe and productive environment.