Preserving Useful Info While Reducing Noise of Physiological Signals by Using Wavelet Analysis

Wavelet analysis is a powerful mathematical tool commonly used in signal processing applications, such as image analysis, image compression, image edge detection, and communications systems. Unlike traditional Fourier analysis, wavelet analysis allows for multiple resolutions in the time and frequency domains; it can preserve time information while decomposing a signal spectrum over a range of frequencies. Wavelet analysis is also more suitable for detecting numerous transitory characteristics, such as drift, trends, abrupt changes, and beginnings and ends of events. These characteristics are often the most important and critical part of some non-stationary signals, such as physiological signals. The thesis focuses on a formal analysis of using wavelet transform for noise filtering. The performance of the wavelet analysis is simulated on a variety of patient samples of Arterial Blood Pressure (ABP 14 sets) and Electrocardiography (ECG 14 sets) from the Mayo Clinic at Jacksonville. The performance of the Fourier analysis is also simulated on the same patient samples for comparison purpose. Additive white Gaussian noise (AWGN) is generated and added to the samples for studying the AWGN effect on physiological signals and both analysis methods. The algorithms of finding the optimal level of approximation and calculating the threshold value of filtering are created and different ways of adding the details back to the approximation are studied. Wavelet analysis has the ability to add or remove certain frequency bands with threshold selectivity from the original signal. It can effectively preserve the spikes and humps, which are the information that is intended to be kept, while de-noising physiological signals. The simulation results show that the wavelet analysis has a better performance than Fourier analysis in preserving the transitory information of the physiological signals

Comparison between Ceph Analysis on Lateral Cephs, CBCT Scans, and MRI Scans

Introduction: Most current methods of obtaining images for orthodontic diagnosis and treatment planning involve the use of ionizing radiation. Given that patients often need records taken several times during treatment, an alternative should be found that does not involve ionizing radiation. Magnetic resonance imaging (MRI) exists as a possible alternative. Purpose: The purpose of this study is to compare cephalometric measurements obtained from lateral cephs, cone beam computed tomography (CBCT) scans, and MR scans. Methods: Lateral cephs, CBCTs, and MRIs were taken on 22 patients. 3 separate readers traced the images and the data was analyzed using Bland-Altman plots. Results: The Bland-Altman plots indicated that the correlation between the imaging methods varied depending on the measurement. The agreement varied from very good to statistically significant bias. However, the bias was judged to have been within normal limits for cephalometric tracing error. Conclusion: Under the conditions of this study, there were statistically significant differences in some of the cephalometric measurements. However, the differences were not clinically significant. This suggests that cephalometric data obtained from MRIs can be used for the purposes of orthodontic diagnosis and treatment planning

Measures of Health-Related Quality of Life Outcomes in Pediatric Neurosurgery: Literature Review

Background Improving value in healthcare means optimizing outcomes and minimizing costs. The emerging pay-for-performance era requires understanding of the effect of healthcare services on health-related quality of life (HRQoL). Pediatric and surgical subspecialties have yet to fully integrate HRQoL measures into practice. The present study reviewed and characterized the HRQoL outcome measures across various pediatric neurosurgical diagnoses. Methods A literature review was performed by searching PubMed and Google Scholar with search terms such as “health-related quality of life” and “pediatric neurosurgery” and then including the specific pathologies for which a HRQoL instrument was found (e.g., “health-related quality of life” plus “epilepsy”). Each measurement was evaluated by content and purpose, relative strengths and weaknesses, and validity. Results We reviewed 68 reports. Epilepsy, brain tumor, cerebral palsy, spina bifida, hydrocephalus, and scoliosis were diagnoses found in reported studies that had used disease-specific HRQoL instruments. Information using general HRQoL instruments was also reported. Internal, test–retest, and/or interrater reliability varied across the instruments, as did face, content, concurrent, and/or construct validity. Few instruments were tested enough for robust reliability and validity. Significant variability was found in the usage of these instruments in clinical studies within pediatric neurosurgery. Conclusions The HRQoL instruments used in pediatric neurosurgery are currently without standardized guidelines and thus exhibit high variability in use. Clinicians should support the development and application of these methods to optimize these instruments, promote standardization of research, improve performance measures to reflect clinically modifiable and meaningful outcomes, and, ultimately, lead the national discussion in healthcare quality and patient-centered care

Global Patterns of Seasonal Variation in Human Fertility a

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/74697/1/j.1749-6632.1994.tb30385.x.pd

Characterization of long RNA-cleaving deoxyribozymes with short catalytic cores: the effect of excess sequence elements on the outcome of in vitro selection

We previously conducted an in vitro selection experiment for RNA-cleaving deoxyribozymes, using a combinatorial DNA library containing 80 random nucleotides. Ultimately, 110 different sequence classes were isolated, but the vast majority contained a short14–15 nt catalytic DNA motif commonly known as 8–17. Herein, we report extensive truncation experiments conducted on multiple sequence classes to confirm the suspected catalytic role played by 8–17 and to determine the effect of excess sequence elements on the activity of this motif and the outcome of selection. Although we observed beneficial, detrimental and neutral consequences for activity, the magnitude of the effect rarely exceeded 2-fold. These deoxyribozymes appear to have survived increasing selection pressure despite the presence of additional sequence elements, rather than because of them. A new deoxyribozyme with comparable activity, called G15–30, was ∼2.5-fold larger and experienced a ∼4-fold greater inhibitory effect from excess sequence elements than the average 8–17 motif. Our results suggest that 8–17 may be less susceptible to the potential inhibitory effects of excess arbitrary sequence than larger motifs, which represents a previously unappreciated selective advantage that may contribute to its widespread recurrence

Older Adults’ Perspective: Exploring the Experience of Owning a Guide Dog

Guide dogs have been shown to be an effective assistive device that can help older adults with low vision navigate their community and improve overall well-being. Despite vast research conducted on pet therapy and dog companionship, limited research exists on the facilitators and barriers of owning a dog guide among older adults with low vision. The purpose of this qualitative phenomenological study is to explore the facilitators and barriers of owning a guide dog as experienced by older adults with low vision participating in Guide Dogs for the Blind (GDB) organization. Data were gathered among seven participants using semi-structured phone interviews and themes were extracted. Five themes emerged using constant comparison methods: changes in habits and routines, being a dog guide owner, increase in community integration, human-dog guide bonding, and guide dog enhances autonomy. Participants’ increased confidence from using their guide dog contributed to further engagement in unfamiliar environments, thus improving self-esteem, freedom, and autonomy. Themes revealed that using a guide dog for the first time required adjustments in daily habits and routines to fit the guide dog’s lifestyle. Moreover, participants felt calmer and safer with the guide dogs resulting in a reciprocal bond with their guide dogs. Study results provide health practitioners, such as occupational therapists (OTs), insight to how guide dogs may affect the daily living patterns and quality of life of older adults with low vision. Additionally, study results provide insight for GDB and OTs into improving support and training processes

Older Adults’ Experience in Owning a Guide Dog

Low vision is an age-related condition that affects many older adults, and may create challenges in everyday activities in older adults. Guide dogs have been shown to be an effective assistive device that can help older adults within their community. Despite vast research on dog companionship, there is limited research on the facilitators and barriers of owning a guide dog among older adults with low vision. The purpose of this qualitative phenomenological study is to explore the facilitators and barriers of owning a guide dog as experienced by older adults with low vision participating in Guide Dogs for the Blind (GDB) organization. Seven first time guide dog owners, ages 55 and older, were interviewed using semi-structured questions. Through constant comparison methods, five major themes emerged: changes in habits and routines, being a dog guide owner, increase in community integration, human-dog guide bonding, and dog guide enhances autonomy. Study results provide implications for occupational therapists (OT) of how guide dogs affect the daily living patterns of older adults. Additionally, study results provide insight for GDB and OTs into improving support and training processes.https://scholar.dominican.edu/ug-student-posters/1063/thumbnail.jp

Genetic mapping and legume synteny of aphid resistance in African cowpea (Vigna unguiculata L. Walp.) grown in California.

The cowpea aphid Aphis craccivora Koch (CPA) is a destructive insect pest of cowpea, a staple legume crop in Sub-Saharan Africa and other semiarid warm tropics and subtropics. In California, CPA causes damage on all local cultivars from early vegetative to pod development growth stages. Sources of CPA resistance are available in African cowpea germplasm. However, their utilization in breeding is limited by the lack of information on inheritance, genomic location and marker linkage associations of the resistance determinants. In the research reported here, a recombinant inbred line (RIL) population derived from a cross between a susceptible California blackeye cultivar (CB27) and a resistant African breeding line (IT97K-556-6) was genotyped with 1,536 SNP markers. The RILs and parents were phenotyped for CPA resistance using field-based screenings during two main crop seasons in a 'hotspot' location for this pest within the primary growing region of the Central Valley of California. One minor and one major quantitative trait locus (QTL) were consistently mapped on linkage groups 1 and 7, respectively, both with favorable alleles contributed from IT97K-556-6. The major QTL appeared dominant based on a validation test in a related F2 population. SNP markers flanking each QTL were positioned in physical contigs carrying genes involved in plant defense based on synteny with related legumes. These markers could be used to introgress resistance alleles from IT97K-556-6 into susceptible local blackeye varieties by backcrossing

Intracranial arachnoid cysts: Pediatric neurosurgery update

Background: With the greater worldwide availability of neuroimaging, more intracranial arachnoid cysts (IACs) are being found in all age groups. A subset of these lesions become symptomatic and requires neurosurgical management. The clinical presentations of IACs vary from asymptomatic to extremely symptomatic. Here, we reviewed the clinical presentation and treatment considerations for pediatric IACs. Case Description: Here, we presented three cases of IAC, focusing on different clinical and treatment considerations. Conclusion: IACs can be challenging to manage. There is no Class I Evidence to guide how these should be treated. We suggest clinical decision-making framework as to how to treat IACs based on our understanding of the natural history, risks/benefits of treatments, and outcomes in the future, require better patient selection for the surgical management of IACs will be warranted