2011 Theses (MU)
https://hdl.handle.net/10355/11138
The theses submitted by Master's degree students to the University of Missouri in 2011.2024-03-29T00:12:27ZAbscisic acid: interactions with ethylene and reactive oxygen species in the regulation of root growth under water deficit
https://hdl.handle.net/10355/11511
Abscisic acid: interactions with ethylene and reactive oxygen species in the regulation of root growth under water deficit
Smith, DanteĢ O.
Abscisic acid (ABA) is involved in several responses to plant water deficits, including an important role in root growth maintenance. Studies of the ABA-deficient maize mutant viviparous 14 (vp14) showed that ABA-deficiency under water deficit conditions causes impaired primary root growth, which was associated with excess production of ethylene and also a dramatic increase in intracellular reactive oxygen species (ROS) in the root growth zone, resulting in loss in membrane integrity and, ultimately, cell death. Several studies in other systems have shown that stress-induced ROS production can trigger ethylene production and, conversely, that ethylene can lead to excess ROS production. To further understand the interrelationships between ethylene, ROS and ABA in water-stressed roots, the vp14 mutant was used to determine whether the increase in ethylene is the cause or result of the increase in ROS. A hydroponic culture system was used to allow controlled application of inhibitors of ethylene synthesis during the growth of ABA-deficient roots at low water potentials, and the effects on ROS levels in the root growth zone were measured by fluorescence microscopy. The results demonstrate that inhibition of ethylene synthesis prevents the increase in intracellular ROS levels and restores root growth in ABA-deficient water-stressed roots, indicating that the interaction of ABA and ethylene is upstream of, and results in, the production of ROS. Further analysis with this system will lead to a greater understanding of the signal transduction pathway and primary mechanisms involved in the regulation of root growth by ABA under water deficit conditions.
Title from PDF of title page (University of Missouri--Columbia, viewed on July 11, 2011).; The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.; Thesis advisor: Dr. Robert E. Sharp.; Includes bibliographical references.; M.S. University of Missouri--Columbia 2011.
2011-01-01T00:00:00ZAchieving energy efficiency in manufacturing : organization, procedures and implementation
https://hdl.handle.net/10355/14965
Achieving energy efficiency in manufacturing : organization, procedures and implementation
Ponte, Sandina
The industrial sector has one of the highest levels of energy consumption and therefore greatly impacts sustainable development around the world. Transitioning to renewable energysources and becoming energy efficient are two ways to reduce greenhouse gas emissions, but thelatter approach will take the least amount of initial investment, provide the quickest payback, and immediate rewards (i.e., cost savings, employee/company morale, and emissions reduction). Energy efficiency is not a new concept, but its implementation has been slow and sometimes non existent in some factories. This is due to many factors, including: lack of in-house expertise, lack of funding, lack of user-friendly tools, lack of institutionalized operational procedures, and most importantly energy efficiency has not been a part of the overall strategy. To overcome these obstacles, this research proposes the introduction of energy efficiency into every layer of the company's overall framework, i.e. the Manufacturing/Supply Process, Human and Organizational, and Information and Control layers. This will be achieved by creating a complete methodology to help industrial organizations to plan and institutionalize energy efficiency solutions as a company wide program. While a systems' approach provides the foundation for the methodology, a web-based Task-Centered Workbook will provide thenecessary tools for technical implementation. With an integrated energy efficiency methodology for factories, the industrial sector will no longer be the highest energy consumer but a contributor to sustainable development. This is an integral part of industrial ecology, which can also benefit from a structured framework that unifies all available tools to better support sustainable development.
Title from PDF of title page (University of Missouri--Columbia, viewed on August 27, 2012).; The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.; Thesis advisor: Dr. Bin Wu; Includes bibliographical references.; M.S. University of Missouri--Columbia 2011.; "May 2011"
2011-01-01T00:00:00ZAction recognition via sequence embedding
https://hdl.handle.net/10355/14908
Action recognition via sequence embedding
Gong, Wei
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] A comb structural exemplar embedding based approach is introduced for action recognition. We propose a new framework to represent an action as a weak classifier pool. During training, firstly, construct a set of static comb structural exemplars from training data; then convolve each exemplar on the training action video; later on, construct a weak classifier pool from minimum distances between the templates and the action sequence. In order to capture both shape and motion features, we employ three different kinds of image representation method, such as edge detection, Histogram of Oriented Gradients (HOG) and Histogram of Optical Flow (HOF). After capturing shape and motion features, salient weak classifiers are picked up by AdaBoost algorithm. Our approach enables robust action recognition in very challenging situations and the framework is validated based on four public standard datasets: the Weizmann dataset, the KTH dataset, IXMAS multi-view dataset and Rochester. Our extensive experimental results from those four datasets are state-of-the-art in terms of performance, tolerance to noise and viewpoints, and robustness across different subjects and datasets.
Title from PDF of title page (University of Missouri--Columbia, viewed on August 23, 2012).; The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.; Thesis advisor: Dr. Tony Han; Includes bibliographical references.; M.S. University of Missouri--Columbia 2011.; "May 2011"
2011-01-01T00:00:00ZAn adaptive non-polling HCCA mechanism for streaming video QOS in IEEE 802.11E network
https://hdl.handle.net/10355/14913
An adaptive non-polling HCCA mechanism for streaming video QOS in IEEE 802.11E network
Lin, Szchyuan
[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT REQUEST OF AUTHOR.] Deployment of wireless networks has risen rapidly in the last decade thanks to their convenience and flexibility. Meanwhile, multimedia service has grown to be the main part of the network traffic. As a result, Quality of service (QoS) became an indispensable part of wireless networks, and consequently 802.11e amendment has been created. There are two QoS mechanisms in 802.11e amendment, one is Enhanced Distributed Coordination Function (EDCA), and the other one is HCF Controlled Channel Access (HCCA). Since HCCA is a contention-free-based mechanism, it can provide a guaranteed QoS which is important for real time multimedia traffic. However, in IEEE802.11e amendment HCCA is not fully specified and has some overhead issues. In this thesis, we propose an innovative way to reduce overhead by utilizing beacon frame. In addition to improve the efficiency of this mechanism, we also utilize different time intervals to separate different transmission phrases and utilize certain data frame to carry traffic queue information.
Title from PDF of title page (University of Missouri--Columbia, viewed on August 23, 2012).; The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.; Thesis advisor: Dr. Wenjun Zeng; Includes bibliographical references.; M. S. University of Missouri--Columbia 2011.; "May, 2011"
2011-01-01T00:00:00Z