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You searched for subject:(rest stops). Showing records 1 – 2 of 2 total matches.

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1. Keen, Heidi A. Activity of group-transported horses during onboard rest stops.

Degree: MS, Animal Science, 2007, Texas A&M University

Activity of group-transported horses was evaluated during onboard rest stops to determine if horses derive meaningful rest. A single-deck semi-trailer separated into three compartments was used for all shipments. In Experiment One, twelve video cameras were used to record behavior of horses during five, 16 to 20 h shipments, with a high (397.44kg/m2), medium (348.48 kg/m2) and low (220.91 kg/m2) density group in each shipment. One-hour rest stops occurred after 8 h of transport and prior to unloading, during which two groups were provided water. Movement of each horse visible on video was quantified by counting the number of times the head crossed the vertical and/or horizontal axes of the body at the withers. Mean number of movements per 5-min interval in each group (n=13) was used to compare effects of density, access to water, and order of stops. The high and low-density watered groups had increased activity during the first 10 min of both rest stops potentially due to maneuvering for access to water. The medium-density watered groups had increased activity during the first 10 min of only the second rest stop. Activity slightly increased in the medium and low-density groups after 55 min possibly indicating adequate rest, but a similar increase did not occur in highdensity groups. In Experiment Two, two shipments, lasting 23 h and 24 h respectively, consisted of three groups of horses loaded at high density (397.32 kg/m2). Ninety-minute rest stops occurred after every 6 h of transport and prior to unloading for a total of three rest stops. Percentage of visible horses "active" was averaged across each 5-min interval of the stop. Activity was highly variable within and between shipments. Activity was high at the beginning of stops one and three of Shipment One. A similar but less dramatic settling occurred at the start of all three rest stops in Shipment Two. Twenty three of thirty-four noted increases in alertness were due to aggression or noises outside the trailer. In both experiments horses remained active during all stops indicating fatigue had not become a major factor in these studies. Advisors/Committee Members: Friend, Theodore H. (advisor), Varner, Gary E. (committee member), H., Welsh Jr., Thomas (committee member).

Subjects/Keywords: horse transport; rest stops

…of horses active during 90-min rest stops for Shipment One …. . 19… …Mean percentage of horses active during 90-min rest stops for Shipment Two… …in other species specifically related to rest stops indicated that direct transport is… …determining the necessary length of rest stops. After 14 h of transport in sheep, live weight is… …USDA Veterinary Services, 2002). New regulations for rest stops, feeding, and provision… 

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APA (6th Edition):

Keen, H. A. (2007). Activity of group-transported horses during onboard rest stops. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/4708

Chicago Manual of Style (16th Edition):

Keen, Heidi A. “Activity of group-transported horses during onboard rest stops.” 2007. Masters Thesis, Texas A&M University. Accessed October 24, 2020. http://hdl.handle.net/1969.1/4708.

MLA Handbook (7th Edition):

Keen, Heidi A. “Activity of group-transported horses during onboard rest stops.” 2007. Web. 24 Oct 2020.

Vancouver:

Keen HA. Activity of group-transported horses during onboard rest stops. [Internet] [Masters thesis]. Texas A&M University; 2007. [cited 2020 Oct 24]. Available from: http://hdl.handle.net/1969.1/4708.

Council of Science Editors:

Keen HA. Activity of group-transported horses during onboard rest stops. [Masters Thesis]. Texas A&M University; 2007. Available from: http://hdl.handle.net/1969.1/4708


Georgia Tech

2. Morris, Steven Michael. Truck Dispatching and Fixed Driver Rest Locations.

Degree: PhD, Industrial and Systems Engineering, 2007, Georgia Tech

This thesis sets out to analyze how restricting rest (sleep) locations for long-haul truckers may impact operational productivity, given hours-of-service regulations. Productivity in this thesis is measured by the minimum number of unique drivers required to feasibly execute a set of load requests over a known planning horizon. When drivers may stop for rest at any location, they may maximize utilization under regulated driving hours. When drivers may only rest at certain discrete locations, their productivity may be diminished since they may no longer be able to fully utilize available service hours. These productivity losses may require trucking firms to operate larger driver fleets. This thesis addresses two specific challenges presented by this scenario; first, understanding how a given discrete set of rest locations may affect driver fleet size requirements; and second, how to determine optimal discrete locations for a fixed number of rest facilities and the potential negative impact on fleet size of non-optimally located facilities. The minimum fleet size problem for a single origin-destination leg with fixed possible rest locations is formulated as a minimum cost network flow with additional bundling constraints. A mixed integer program is developed for solving the single-leg rest facility location problem. Tractable adaptations of the basic models to handle problems with multiple lanes are also presented. This thesis demonstrates that for typical long-haul lane lengths the effects of restricting rest to a relatively few fixed rest locations has minimal impact on fleet size. For an 18-hour lane with two rest facilities, no increase in fleet size was observed for any test load set instances with exponentially distributed interdeparture times. For test sets with uniformly distributed interdeparture times, additional required fleet sizes ranged from 0 to 11 percent. The developed framework and results should be useful in the analysis of truck transportation of security-sensitive commodities, such as food products and hazardous materials, where there may exist strong external pressure to ensure that drivers rest only in secure locations to reduce risks of tampering. Advisors/Committee Members: Erera, Alan (Committee Chair), Ergun, Ozlem (Committee Member), Nair-Reichert, Usha (Committee Member), Savelsbergh, Martin (Committee Member), White, Chelsea (Committee Member).

Subjects/Keywords: Mixed integer programming; Network flow; Scheduling; Truck; Driver; Rest; Truck stops; Truck drivers; Scheduling; Mathematical optimization

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Morris, S. M. (2007). Truck Dispatching and Fixed Driver Rest Locations. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/19745

Chicago Manual of Style (16th Edition):

Morris, Steven Michael. “Truck Dispatching and Fixed Driver Rest Locations.” 2007. Doctoral Dissertation, Georgia Tech. Accessed October 24, 2020. http://hdl.handle.net/1853/19745.

MLA Handbook (7th Edition):

Morris, Steven Michael. “Truck Dispatching and Fixed Driver Rest Locations.” 2007. Web. 24 Oct 2020.

Vancouver:

Morris SM. Truck Dispatching and Fixed Driver Rest Locations. [Internet] [Doctoral dissertation]. Georgia Tech; 2007. [cited 2020 Oct 24]. Available from: http://hdl.handle.net/1853/19745.

Council of Science Editors:

Morris SM. Truck Dispatching and Fixed Driver Rest Locations. [Doctoral Dissertation]. Georgia Tech; 2007. Available from: http://hdl.handle.net/1853/19745

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