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Wright State University ETDs

Mostrando recursos 1 - 20 de 375

  1. ICI Reduction Methods for MC-CDMA Systems

    Wu, Meng
    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...

  2. Differential effects of mutant TAp63γ on transactivation of p53 and/or p63 responsive genes and their effects on global gene expression

    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...

  3. Adaptive Performance: An Examination of Convergent and Predictive Validity

    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...

  4. A STUDY OF MULTI-ECHELON INVENTORY SYSTEMS WITH STOCHASTIC CAPACITY AND INTERMEDIATE PRODUCT DEMAND

    Niranjan, Suman
    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...

  5. Microstructural Stability and Thermomechanical Processing of Boron Modified Beta Titanium Alloys

    Cherukuri, Balakrishna
    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...

  6. The Moderating Influence of Stress Appraisals and Affect on Performance under Fatigue

    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...

  7. Investigating the Role of Subunit III in the Structure and Function of Rhodobacter Sphaeroides Cytochrome C Oxidase

    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...

  8. Modeling Training Effects on Task Performance Using a Human Performance Taxonomy

    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...

  9. In Search For New p53 Regulated Genes

    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),...

  10. Electrochemistry of trinuclear metal clusters of molybdenum and tungsten in 1-ethyl-3- methylimidazolium tetrafluoroborate

    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 [Mo2WO2(O2CCH3)6(H2O)3]^+2 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 ≈...

  11. Wavelength Division Multiplexing Optical Networks for Supporting Grid Computing

    Luo, Xubin
    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...

  12. GPS Coarse Acquisition Using the MonoBit FFT Algorithm in a Broadband Receiver

    Flynn, John
    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...

  13. EXPLORATION OF GRADIENT-TYPE POLY(ARYLENE ETHER)S VIA AN ABB' MONOMER SYSTEM

    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...

  14. AUTOMATED ANALYSIS OF METACARPAL CORTICAL THICKNESS IN SERIAL HAND RADIOGRAPHS

    Raheja, Aarti
    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...

  15. ANALYSIS OF FIRST-YEAR STUDENT PERCEPTIONS REGARDING THE EFFECTIVENESS OF UVC 101 CLASSES ON ACADEMIC ACHIEVEMENT, SOCIAL SUCCESS, AND PERSONAL GROWTH AND DEVELOPMENT BASED ON HIGH SCHOOL G.P.A

    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...

  16. REAL-TIME HILBERT TRANSFORM AND AUTOCORRELATION FOR DIGITAL WIDEBAND COMMUNICATION APPLICATIONS

    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...

  17. A Construct Validation of the Neutral Objects Satisfaction Questionnaire (NOSQ)

    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...

  18. Histogram-based template matching object detection in images with varying brightness and contrast

    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...

  19. 1-Alkyl-3-Methylimidazolium bis(pentafluoroethylsulfonyl)imide Based Ionic Liquids: A Study of their Physical and Electrochemical Properties

    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...

  20. An Algorithm for the Detection of Handguns in Terahertz Images

    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....

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