Series
Master's Projects
Master's Projects
Permanent Link
Series Type
Publication Series
Description
Associated Organization(s)
Associated Organization(s)
Publication Search Results
Now showing
1 - 6 of 6
-
ItemEnabling Software Defined Optical Networks(Georgia Institute of Technology, 2015) Panchal, DevenThis paper gives an overview of Software Defined Optical Networks (SDON’s) and how they can be implemented. It traces the evolution of Optical networks upto GMPLS and traces the idea of SDN and builds upto OpenFlow. The paper explores the need for SDON’s and explains what a SDON solution could look like, including the hardware. It also seeks to explain how OpenFlow could be used as a part of this solution to overcome the limitations of GMPLS.
-
Item5G Cellular - An Energy Efficiency Perspective(Georgia Institute of Technology, 2014-12) Panchal, DevenWhile the 5G technology of cellular communications promises great capacity and coverage to access information anywhere and anytime, it is feared to have huge power consumption. Significant research been has been directed towards solving this problem which exists both on the subscribers’ side as well as the operators’ side. There have been efforts like predicting traffic, modifying the physical layer etc. towards making the 5G technology more energy efficient. The aim of this study is to see the technology enablers for 5G from an energy efficiency perspective. Efforts will be made to point out specific areas in 5G cellular where improvements or modifications could make 5G cellular more energy efficient.
-
ItemAnalysis of Human-System Interaction For Landing Point Redesignation(Georgia Institute of Technology, 2009-05-26) Chua, Zarrin K.Despite two decades of manned spaceflight development, the recent thrust for increased human exploration places significant demands on current technology. More information is needed in understanding how human control affects mission performance and most importantly, how to design support systems that aid in human-system collaboration. This information on the general human-system relationship is difficult to ascertain due to the limitations of human performance modeling and the breadth of human actions in a particular situation. However, cognitive performance can be modeled in limited, well-defined scenarios of human control and the resulting analysis on these models can provide preliminary information with regard to the human-system relationship. This investigation examines the critical case of lunar Landing Point Redesignation (LPR) as a case study to further knowledge of the human-system relationship and to improve the design of support systems to assist astronauts during this task. To achieve these objectives, both theoretical and experimental practices are used to develop a task execution time model and subsequently inform this model with observations of simulated astronaut behavior. The experimental results have established several major conclusions. First, the method of LPR task execution is not necessarily linear, with tasks performed in parallel or neglected entirely. Second, the time to complete the LPR task and the overall accuracy of the landing site is generally robust to environmental and scenario factors such as number of points of interest, number of identifiable terrain markers, and terrain expectancy. Lastly, the examination of the overall tradespace between the three main criteria of fuel consumption, proximity to points of interest, and safety when comparing human and analogous automated behavior illustrates that humans outperform automation in missions where safety and nearness to points of interest are the main objectives, but perform poorly when fuel is the most critical measure of performance. Improvements to the fidelity of the model can be made by transgressing from a deterministic to probablistic model and incorporating such a model into a six degree-of-freedom trajectory simulator. This paper briefly summarizes recent technological developments for manned spaceflight, reviews previous and current efforts in implementing LPR, examines the experimental setup necessary to test the LPR task modeling, discusses the significance of findings from the experiment, and also comments on the extensibility of the LPR task and experiment results to human Mars spaceflight.
-
ItemComputational Fluid Dynamics Validation of a Single, Central Nozzle Supersonic Retropropulsion Configuration(Georgia Institute of Technology, 2009-05) Cordell, Christopher E., Jr.Supersonic retropropulsion provides an option that can potentially enhance drag characteristics of high mass entry, descent, and landing systems. Preliminary flow field and vehicle aerodynamic characteristics have been found in wind tunnel experiments; however, these only cover specific vehicle configurations and freestream conditions. In order to generate useful aerodynamic data that can be used in a trajectory simulation, a quicker method of determining vehicle aerodynamics is required to model supersonic retropropulsion effects. Using computational fluid dynamics, flow solutions can be determined which yield the desired aerodynamic information. The flow field generated in a supersonic retropropulsion scenario is complex, which increases the difficulty of generating an accurate computational solution. By validating the computational solutions against available wind tunnel data, the confidence in accurately capturing the flow field is increased, and methods to reduce the time required to generate a solution can be determined. Fun3D, a computational fluid dynamics code developed at NASA Langley Research Center, is capable of modeling the flow field structure and vehicle aerodynamics seen in previous wind tunnel experiments. Axial locations of the jet terminal shock, stagnation point, and bow shock show the same trends which were found in the wind tunnel, and the surface pressure distribution and drag coefficient are also consistent with available data. The flow solution is dependent on the computational grid used, where a grid which is too coarse does not resolve all of the flow features correctly. Refining the grid will increase the fidelity of the solution; however, the calculations will take longer if there are more cells in the computational grid.
-
ItemAlkaline pulping : deadload reduction studies in chemical recovery system(Georgia Institute of Technology, 2004-12-02) Chandra, YusupThe kraft pulping process has been known for decades. The focus in kraft pulping has always been on better operation of the chemical recovery system. One of the targets is on deadload (sodium sulfate (Na2SO4) and sodium carbonate (Na2CO3)) reduction in white liquor. A model based on several literature references was developed to study the effect of deadload reduction. A base model was developed based on current mill operation. This base model was compared to the deadload reduction model. Overall improvement, such as operating cost saving and revenue generation was achieved from deadload reduction. Operating cost saving involves less deadload chemical in chemical recovery system, and less water that was associated with the deadload itself. Revenue generation involves generating more steam and heat from the recovery boiler that can be used for mill purposes or energy revenue. Two important variables to achieve deadload reduction are causticizing efficiency and reduction efficiency.
-
ItemAn assessment of people mover technologies for Georgia Tech(Georgia Institute of Technology, 1992) Schreiber, RobertThis analysis of "people mover" technologies addresses the comparative advantages and disadvantages of several fixed guideway transportation systems. The project was initiated as one part of an evaluation of transportation needs for the Georgia Institute of Technology. Manufacturers of people mover systems were asked to respond to a technical questionnaire with information describing their systems. Fifteen vendors replied, formally proposing 20 different systems for evaluation. Information from their responses was extracted and either entered into matrices of technical data or summarized and explained in descriptions of their systems. The report concludes that Personal Rapid Transit technology is most appropriate for further research, development, and eventual deployment for service on Tech's campus. The next most appropriate selection is the mass transit system supplied by Aeromovel. All other technologies are recommended with lesser degrees of appropriateness.