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You searched for +publisher:"University of Louisville" +contributor:("Rockaway, Thomas D."). Showing records 1 – 3 of 3 total matches.

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University of Louisville

1. Schmidt, Martin J.R., 1966-. The effect of infrastructure changes on railway operations.

Degree: PhD, 2014, University of Louisville

This paper makes use of standard simulation programs in combination with the tools of applied statistics to simulate railway operations. The purpose of the use of this tool is to evaluate and compare different possible kinds of railway infrastructure, like different types of signaling procedures, different network configuration or operational procedures. A railway system is a logistic network and because of the demand for improved railway operation, much work has been undertaken lately in this scientific field. However the author postulates the hypothesis based on a literature review that in a lot of these works there is a lack of full application of statistics. With this paper the author makes use of standard simulation programs for detailed simulation of railway operation especially with respect to the signaling and operation procedures. Additionally the influence of delays, which occur during real life railway operation is taken into account for a first time. This allows statistical evaluation of the results based on statistical significance. Also sensitivity analysis could be performed. It is demonstrated, that the results of such simulation runs show superior results when compared to other techniques not taking into account the variability. Additionally, procedures were developed to find the capacity of a railway network with the help of additional software tools. In this work the software package ARENA is used to simulate the operation of trains in railway networks. For this approach two major obstacles have to be solved: the simulation of train travelling times and the simulation of block rules used in railway operation. By introduction of visualization the confidence in the results of simulation, even for stakeholders not familiar with this technique, is increased. In this paper it is shown that with ARENA it is possible to calculate the capacity of different railway networks (scenarios). The results, which are calculated using quasi steady state simulation without variation, are similar to those obtained with other calculation methods. Additionally in one scenario the rule of thumb for the quotient between theoretical capacity and practical capacity in a railway network is confirmed by simulation including random variation. It is also demonstrated that OptQuest, an additional software package available for ARENA, is a suitable tool to find near optimal timetables in a scenario including delays. The results of this work may be not only of interest for railway operators, but also for operators of other automated transport systems. Such systems may be unmanned transport vehicles in a factory, transporting goods between different manufacturing stations. But also for automation of road traffic the results may be of interest. Advisors/Committee Members: DePuy, Gail W., Biles, William E., Evans, Gerald W., Rockaway, Thomas D..

Subjects/Keywords: Management Sciences and Quantitative Methods; Transportation Engineering

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APA (6th Edition):

Schmidt, Martin J.R., 1. (2014). The effect of infrastructure changes on railway operations. (Doctoral Dissertation). University of Louisville. Retrieved from 10.18297/etd/1769 ; https://ir.library.louisville.edu/etd/1769

Chicago Manual of Style (16th Edition):

Schmidt, Martin J.R., 1966-. “The effect of infrastructure changes on railway operations.” 2014. Doctoral Dissertation, University of Louisville. Accessed February 22, 2019. 10.18297/etd/1769 ; https://ir.library.louisville.edu/etd/1769.

MLA Handbook (7th Edition):

Schmidt, Martin J.R., 1966-. “The effect of infrastructure changes on railway operations.” 2014. Web. 22 Feb 2019.

Vancouver:

Schmidt, Martin J.R. 1. The effect of infrastructure changes on railway operations. [Internet] [Doctoral dissertation]. University of Louisville; 2014. [cited 2019 Feb 22]. Available from: 10.18297/etd/1769 ; https://ir.library.louisville.edu/etd/1769.

Council of Science Editors:

Schmidt, Martin J.R. 1. The effect of infrastructure changes on railway operations. [Doctoral Dissertation]. University of Louisville; 2014. Available from: 10.18297/etd/1769 ; https://ir.library.louisville.edu/etd/1769


University of Louisville

2. Striegel,, Klaus, 1950-. Simulation model for optimization of a landside harbor logistic chain of container terminals.

Degree: PhD, 2014, University of Louisville

The world wide transportation of all kind of goods with containers is a fast growing business. The challenge is to transport in the shortest time to the lowest cost. The vessels therefore become bigger and bigger. The biggest vessel with 16000 TEU is since December 2012 in service. But the next generation with 18000-22000 TEU is already being built. This raises questions in acceleration of loading and unloading process, the handling in the yards of the harbors and the transportation of the containers to Hinterland. The most common way is still to transport the container from the yard by truck, which causes a lot of traffic jams and pollution. With the growth of the volume and the limited space in most harbours the throughput in the yards must be dramatically increased. One possibility is to reduce multiple handling of the containers and to decentralize the transport to Hinterland. The idea of Dryports emerged several years ago. In this research a simulation model of all processes in the logistic chain is designed, with which all steps are linked together. A direct flow of the containers without any intermediate stocking in the yard. Todays average staytime of the containers in the yard of 3-4 days is completely deleted. The multiple handling is avoided. The variability of all input figures and constraints allows that the most real situations can be considered. Three different modalsplits are run in simulation. The results show, that it is possible to reduce the throughput time of the containers and the overall loading and unloading process of vessels in the harbor and to gain a high productivity. With the satellite model ( Dryport ) it is possible to reduce traffic in the yard and to avoid a lot of pollution. Overall shorter service times give an answer to the challenge of managing the future growth of the container business. The feasibility of the proposed model is confirmed. Advisors/Committee Members: Biles, William E., Evans, Gerald W., Evans, Gerald W., Bai, Lihui, Rockaway, Thomas D..

Subjects/Keywords: Industrial Engineering

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

APA (6th Edition):

Striegel,, Klaus, 1. (2014). Simulation model for optimization of a landside harbor logistic chain of container terminals. (Doctoral Dissertation). University of Louisville. Retrieved from 10.18297/etd/2268 ; https://ir.library.louisville.edu/etd/2268

Chicago Manual of Style (16th Edition):

Striegel,, Klaus, 1950-. “Simulation model for optimization of a landside harbor logistic chain of container terminals.” 2014. Doctoral Dissertation, University of Louisville. Accessed February 22, 2019. 10.18297/etd/2268 ; https://ir.library.louisville.edu/etd/2268.

MLA Handbook (7th Edition):

Striegel,, Klaus, 1950-. “Simulation model for optimization of a landside harbor logistic chain of container terminals.” 2014. Web. 22 Feb 2019.

Vancouver:

Striegel,, Klaus 1. Simulation model for optimization of a landside harbor logistic chain of container terminals. [Internet] [Doctoral dissertation]. University of Louisville; 2014. [cited 2019 Feb 22]. Available from: 10.18297/etd/2268 ; https://ir.library.louisville.edu/etd/2268.

Council of Science Editors:

Striegel,, Klaus 1. Simulation model for optimization of a landside harbor logistic chain of container terminals. [Doctoral Dissertation]. University of Louisville; 2014. Available from: 10.18297/etd/2268 ; https://ir.library.louisville.edu/etd/2268

3. Shafaie, Abolfazl, 1978-. Classification system of the physical streambed habitat.

Degree: PhD, 2014, University of Louisville

A streambed is the channel bottom of a stream, river, or creek; the physical confine of the normal water flow. It provides necessities for fish and microinvertebrate including shelter, food, and breeding spots. Therefore, it is an essential part of aquatic animal habitats and often seen as an index of stream health. There is no generally accepted method to quantify streambed physical components and depending upon state and organization a variety of methods are used. The procedure provided in the rapid bioassessment protocol (RBP) (Kaufmann et al., 1999; Sylte and Fischenich, 2002) is probably the most widely used method to assess the effect of various land use activates on stream habitat for management purposes in the United States. The RBP method was not intended as a procedure to assess streambed habitat; although it is often used for this purpose. This approach reduces the streambed physical components into the two variables: embeddedness and epifaunal substrate. Definitions and sampling procedure of these variables are vague and subjective. Streambed components with varying characteristics are grouped under the same category and some streambed components as important as gravel are not included in the categorizing of the streambed habitat. A measurement method that combines a photographic technique and grid sampling was developed to assess streambed components in a direct and simple way at the required level of accuracy. The portable photographic box (PPB) device utilizes a photographic technique to record images of physical streambed components under typical base flow of wadeable gravel-bed streams. Recorded images were digitized manually and the area of each streambed component in each grid cell was estimated to evaluate projected area of streambed component. The PPB facilitates sampling of streambed components of unit population with adequate picture quality rapidly. Five scenarios for sampling methods with varying accuracy and field and laboratory time requirements for quick and simple inventory of impaired stream habitat were recommended. Based on statistical analysis, residual was reduced from 33% in the rapid bioassessment to 28%, 14%, 7%, 5% and 0% in the first, second, third, fourth, and fifth scenario, respectively. In addition, measurement of the dissolved oxygen and temperature in ten riffles indicated that temperature in the first layer of subsurface was similar to those measured in the water column. No evidence was found to support substrate measurement of temperature. However, the dissolved oxygen concentration varied significantly for embedded and free patches. In contrast to the free gravel and epifaunal substrate, the DO content in fine material, embedded gravel, and embedded epifaunal substrate components was in anoxia and hypoxia. Hypoxia and anoxia lasted for several days after flood events. Advisors/Committee Members: Parola, Arthur C., French, Mark N., French, Mark N., Rockaway, Thomas D., DePuy, Gail W..

Subjects/Keywords: Civil and Environmental Engineering

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

APA (6th Edition):

Shafaie, Abolfazl, 1. (2014). Classification system of the physical streambed habitat. (Doctoral Dissertation). University of Louisville. Retrieved from 10.18297/etd/1303 ; https://ir.library.louisville.edu/etd/1303

Chicago Manual of Style (16th Edition):

Shafaie, Abolfazl, 1978-. “Classification system of the physical streambed habitat.” 2014. Doctoral Dissertation, University of Louisville. Accessed February 22, 2019. 10.18297/etd/1303 ; https://ir.library.louisville.edu/etd/1303.

MLA Handbook (7th Edition):

Shafaie, Abolfazl, 1978-. “Classification system of the physical streambed habitat.” 2014. Web. 22 Feb 2019.

Vancouver:

Shafaie, Abolfazl 1. Classification system of the physical streambed habitat. [Internet] [Doctoral dissertation]. University of Louisville; 2014. [cited 2019 Feb 22]. Available from: 10.18297/etd/1303 ; https://ir.library.louisville.edu/etd/1303.

Council of Science Editors:

Shafaie, Abolfazl 1. Classification system of the physical streambed habitat. [Doctoral Dissertation]. University of Louisville; 2014. Available from: 10.18297/etd/1303 ; https://ir.library.louisville.edu/etd/1303

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