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Full-Text Articles in Engineering
Quantitative Analysis Of The Impact Of Craft Labor Availability On Construction Project Performance, Hossein Karimi
Quantitative Analysis Of The Impact Of Craft Labor Availability On Construction Project Performance, Hossein Karimi
Theses and Dissertations--Civil Engineering
A shortage of skilled craft labor in the North American construction industry has been an unfortunate cyclic trend since the late 1980s. This shortage has been reported and discussed frequently by numerous past studies in the context of construction industry. The 2008 U.S. recession was at least one period when the craft shortage temporarily improved, as witnessed by spikes in construction unemployment rates above 20% due to the work slowdowns. However, the current economic recovery period is once again experiencing craft shortages in some sectors of the U.S. construction industry. Although the past literature provides wealth of information about influence …
Object Detection For Agricultural And Construction Environments Using An Ultrasonic Sensor, Joseph S. Dvorak, Marvin L. Stone, Kelvin P. Self
Object Detection For Agricultural And Construction Environments Using An Ultrasonic Sensor, Joseph S. Dvorak, Marvin L. Stone, Kelvin P. Self
Biosystems and Agricultural Engineering Faculty Publications
This study tested an ultrasonic sensor‘s ability to detect several objects commonly encountered in outdoor agricultural or construction environments: a water jug, a sheet of oriented strand board (OSB), a metal fence post, a human model, a wooden fence post, a Dracaena plant, a juniper plant, and a dog model. Tests were performed with each target object at distances from 0.01 to 3 m. Five tests were performed with each object at each location, and the sensor‘s ability to detect the object during each test was categorized as "undetected," "intermittent," "incorrect distance," "good." Rigid objects that presented a larger surface …