Multi-carrier code-division multiple-access (MC-CDMA) is an important multiple access candidate for 4G wireless communication system. While MC-CDMA provides high performance and high capacity in frequency selective fading channels, it is very sensitive to the signal distortion, especially the Inter Carrier Interference (ICI). We apply self-cancelation and a frequency transmission paradigm to MC-CDMA system to improve the sytem performance in an ICI rich environment. Furthermore, we combine the frequency transmission paradigm FD-MC-CDMA with ICI cancelation. Also, we apply all these three schemes into non-contiguous OFDM and non-contiguous MC-CDMA systems in simple Cognitive Radio communication environments and present the simulation results. Theoretical...
Khokhar, Shama Khan
p63, a member of the p53 gene family, known to play a role in development, has more recently also been implicated in cancer progression. Mice lacking p63 exhibit severe developmental defects such as limb truncations, abnormal skin, and absence of hair follicles, teeth, and mammary glands. Germline missense mutations of p63 have been shown to be responsible for several human developmental syndromes including SHFM, EEC and ADULT syndromes and are associated with anomalies in the development of organs of epithelial origin. The contrasting phenotypes associated with the different classes of p63 mutations might be in part due to the differential...
Stokes, Charlene K.
The purpose of the present study was twofold: 1) to examine the convergent validity of the two foremost measurement methods, subjective and objective, used to assess adaptive performance; and 2) to examine the predictive validity of variables across measurement methods using a path model framework. Specifically, various dispositional traits are posited to influence adaptive performance through the mediating mechanisms of stress appraisals and self-efficacy. Beyond examining the potential causal paths associated with predictors, the study included a commensurate focus on adaptability as an outcome and addressed the measurement issues that surround adaptive performance. Participants (N = 275) in teams of...
The research in this dissertation involves the study of several multi-echelon inventory systems with stochastic capacity and intermediate product demand. Specifically we analyze the behavior of the system which consists of several intermediate product demands. The analysis is primarily three fold i) developed update (relational) equations for all the multi-echelon inventory systems under several inventory allocation policies, ii) develop two simulation optimization approaches 1) OptQuest framework, and 2) IPA (Infinitesimal Perturbation Analysis) framework, used to minimize the total cost of the inventory systems that satisfy the desired customer service level, iii) obtain numerical results for all the multi-echelon inventory systems...
One of the main objectives during primary processing of titanium alloys is to reduce the prior beta grain size. Producing an ingot with smaller prior beta grain size could potentially eliminate some primary processing steps and thus reduce processing cost. Trace additions of boron have been shown to decrease the as-cast grain size in alpha + beta titanium alloys. The primary focus of this dissertation is to investigate the effect of boron on microstructural stability and thermomechanical processing in beta titanium alloys.
Two metastable beta titanium alloys: Ti-15Mo-2.6Nb-3Al-0.2Si (Beta21S) and Ti-5Al-5V-5Mo-3Cr (Ti5553) with 0.1 wt% B and without boron additions were...
Schmidt, Regina M.
This study demonstrated that in a group of seventeen active duty soldiers, performance on an attack combat simulation significantly degraded after approximately 30 h of sleep deprivation. In addition, individual differences were identified, as approximately half of the participants maintained performance throughout the sleep deprivation period, while other participants degraded in performance. The main objective of this study was to test the efficacy of micro-level cognitive performance and subject state factors to account for this dichotomy in performance that was particular to the last testing session. Results showed that performance on a decision making test with rapid reaction time constraints...
Geyer, R. Ryan
The role of subunit III (SIII) in cytochrome c oxidase structure and function was investigated using enzyme isolated from the bacterium Rhodobacter sphaeroides. Energy minimization calculations suggested that in the absence of SIII, subunit I (SI) adopted a more open conformation. This observation was tested through the use of limited proteolysis using, á-chymotrypsin. The results showed that in the absence of SIII the solution structures of wild-type and I/II oxidase were not significantly different, and that proteolysis occurred exclusively at the N and C-termini of SI. Upon inactivation of I/II oxidase by catalytic turnover, and subsequent digestion with the protease...
Meador, Douglas P.
There is little argument that modern military systems are very complex, both in terms of the resources in time and money to develop them and the infrastructure that is required to produce trained operators. To properly execute human systems integration during the acquisition process, systems built to train operators must be developed that optimize training. Consequently, the training system community would benefit from simulation models that provide the ability to make accurate predictions of training processes, and allow the decision maker to specify an optimum combination of operator performance after training and the cost of that training. The goal of...
Mpagi, Meldrick Daniel
Mpagi, Meldrick. M.S., Department of Biochemistry and Molecular Biology, Wright State University, 2008. In Search For New p53 Regulated Genes.
The p53 tumor suppressor protein has the ability to transactivate its target genes whose gene products are involved in carrying out cell cycle arrest, apoptosis, DNA repair, and senescence. Here, I report that two genes may be p53 regulated. Utilizing a microarray method to search for novel p53 target genes, I was able to identify a possible transcriptional target of p53 being solute carrier family 1a1 (SLC1a1). Along with that finding I also identified an E2F-target gene, minichromosome maintenance 10 (MCM10),...
Harris, Tracey Lynn
The imidazolium based ionic liquid: 1-ethyl-3-
methylimidizoliumtetrafluoroborate, (EMIBF4) was synthesized to be used as a
solvent for the electrochemical investigation of molybdenum and tungsten. The
electrochemical window is about 4.2V after removing traces of impurities such as
Cl- and H2O. Electronic spectra of metal clusters [Mo3O2(O2CCH3)6(H2O)3]^+2 ;
[W3O2(O2CCH3)6(H2O)3]^+2 ; [MoW2O2(O2CCH3)6(H2O)3]^+2 and
in EMIBF4 are identical to the spectra of the same
clusters obtained in water. Cyclic voltammogram (CV) of Mo and W clusters
obtained in EMIBF4 are clearly dependant on the potential of working electrode.
For example the CV of [Mo3O2(O2CCH3)6(H2O)3]^+2 metal clusters on glassy
carbon electrodes displays a reduction peak at ≈ +1.0V and a reversible oxidation
peak at ≈...
Grid computing is a computing model in which various resources, such as processing power, storage systems, data sources, or instruments, are interconnected by a communication infrastructure and accessible as a public utility for solving large scale resource intensive problems. Grid computing requires dynamic communication between distributed resources and high bandwidth quality assured survivable communication services. Optical fiber communication and networking with wavelength division multiplexing (WDM) provides a promising means to support the communication needs of grid computing, by offering huge capacity, relatively low latency, as well as dynamic control and allocation of bandwidth at various granularities. In this dissertation, we...
The purpose of this research was to investigate the feasibility of using broadband electronic warfare (EW) receivers for Global Position System (GPS) tracking. These are pulse-oriented receivers, typically with input bandwidths of 1 Ghz or larger, and so by definition do not have the same characteristics and processing of continuous wave (CW) receivers like GPS devices, FM radios, etc. For example, the spectral output of the Fast Fourier Transform (FFT) used in broadband signal processing updates on the frequency of the FFT input sample size, versus a CW receiver which updates on a more continuous basis.
The foundation of this...
Dolgov, Alex V.
Dolgov, Alex. MS., Department of Chemistry, Wright State University, 2008. Exploration of Gradient-type Poly(arylene ether)s via an ABB' Monomer System.
Evidence shows that a gradient like copolymer can be synthesized using nucleophilic aromatic substitution, NAS, chemistry. Using the 4-chloro-3-fluoro-4'hydroxydiphenylsulfone monomer, 5, it is possible to control the ratios of the leaving groups, in this case the fluorine and the chlorine, with the right solvent and temperature. Alternating the temperatures will alter the substitution of the leaving groups, thus forming a polymer backbone of gradient characteristics. Initial reactions to determine the relative rates of displacement of the chlorine and fluorine atoms were...
To understand the roles of various genes that influence skeletal bone accumulation and loss, accurate measurement of bone mineralization is needed. However, it is a challenging task to accurately assess bone growth over a person�™s lifetime. Traditionally, manual analysis of hand radiographs has been used to quantify bone growth, but these measurements are tedious and may be impractical for a large-scale growth study. The aim of this project was to develop a tool to automate the measurement of metacarpal cortical bone thickness in standard hand-wrist radiographs of humans aged 3 months to 70+ years that would be more accurate, precise...
Hummel, Amanda Sue
First-year experience initiatives have been underway in a variety of forms. Today, first-year seminar classes are popular transitional aids for new college students throughout the country. First-year seminars typically have common learning goals for new students. Academic achievement, social success, and personal growth and development were the learning goals assessed during this study.
The purpose and scope of this study was to analyze first-year students and their perceptions regarding the effectiveness of UVC 101 classes on academic achievement, social success, and personal growth and development based on their self-reported high school grade point averages. Students at a large four-year...
Srinivasa Murthy, Dilip
Digital wideband receiver plays a key role in communication and radar systems, and it is used detect and analyze wide range of radio frequency (RF) signals. A digital Instantaneous Frequency Measurement (IFM) receiver is designed, where implementation of a real-time architecture of a Hilbert transform and autocorrelation algorithm is presented. Real-time architecture performs continuous monitoring and processing of the incoming signal. Prior to the previous one bit design, the input data fed to the Hilbert transform is 8-bit wide at a clock rate of 320 MHz with the input data rate is increased by a factor of eight, an 8-bit...
Eschleman, Kevin J.
The current study is a construct validation of the Neutral Objects Satisfaction Questionnaire (NOSQ). The study includes tests of convergent and discriminant validity. Specifically, the NOSQ had more empirical overlap with affective-oriented dispositions (i.e., positive affectivity, negative affectivity, neuroticism, extraversion, trait anxiety, trait anger, trait depression, and cheerfulness) than with cognitive-oriented dispositions (i.e., need for cognition, general self-efficacy, and locus of control). In addition, the NOSQ had greater empirical overlap with the aforementioned affective-oriented dispositions than with a measure of temporal affect (i.e., mood). Correlations between the NOSQ and both job satisfaction and job cognitions were also compared, but no...
Schrider, Christina Da-Wann
Our challenge was to develop a semi-automatic target detection algorithm to aid human operators in locating potential targets within images. In contrast to currently available methods, our approach is relatively insensitive to image brightness, image contrast and object orientation. Working on overlapping image blocks, we used a sliding difference method of histogram matching. Incrementally sliding the histograms of the known object template and the image region of interest (ROI) together, the sum of absolute histogram differences was calculated. The minimum of the resultant array was stored in the corresponding spatial position of a response surface matrix. Local minima of the...
DeCerbo, Jennifer N.
Ionic liquids are an attractive possibility for battery electrolytes. Five ionic liquids were synthesized using a 1-alkyl-3-methylimidazolium (XMI+) cation, where the alkyl group was ethyl, propyl, butyl, pentyl, or hexyl, and a bis(pentafluoroethyl-sulfonyl)imide (Beti-) anion. The absorption and desorption of water, conductivities, densities, viscosities, decomposition temperatures, and electrochemical properties were studied. These ionic liquids were found to absorb less water than previously studied ionic liquids with tetrafluoroborate (BF4-) and hexafluorophosphate (PF6-) anions. Their conductivities decreased with longer alkyl chains on the imidazolium cation and were lower than ionic liquids with BF4- as the anion. The densities of the ionic liquids...
Lingg, Andrew J.
This paper presents an algorithm for detecting handguns in terahertz images. Terahertz radiation is capable of penetrating certain materials which are opaque at
optical wavelengths, such as clothing, without the harmful effects of ionizing radiation. The approach taken is to segment objects of interest and classify them based on shape. We use a modified version of an active contour algorithm found in the open literature. Modifications include: a pre-processing step that includes clutter filtering and seeding of an initial contour; and a post-processing step that removes clutter pixels from the
segmentation. The features used for classification are moment-based and Fourier shape descriptors....