Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 37 for “"undersampling"”.
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Undersampling GA-SVM for network intrusion detection
… high classification accuracy. It proposes an undersampling Genetic Algorithm-Support Vector Machine (GA-SVM) method to handle this problem. It applies an undersampling method in GA-SVM. To solve the multiclassification problem with a binary classifier, this work proposes to utilize the …
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Comparison of Classification Algorithms and Undersampling Methods on Employee Churn Prediction: A Case Study of a Tech Company
… combines machine learning techniques with undersampling in hopes of identifying employees at risk of churn so retention strategies can be implemented before it is too late. Four different classification algorithms are tested on a variety of undersampled datasets in order to find the most …
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Fitting AdaBoost Models From Imbalanced Data with Applications in College Basketball
… when working with real world data. Over/undersampling approaches allow us to gather more insight from the limited data we have on the minority class; however, there are many proposed methods. The goal of our study is to identify the optimal approach for over/undersampling to use with …
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Investigation of improved methods for assessing convergence of models in MCNP using Shannon entropy
… Shannon entropy and statistical checks for tally undersampling in order to reduce the burden on the code user, hopfully increasing the use and accuracy of Monte Carlo codes. These methods were tested by simulating the OECD/NEA benchmark #1 problem in MCNP. It was found that Shannon entropy does …
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A low cost asynchronous eye diagram reconstruction system for high speed links
… diagram reconstruction system using asynchronous undersampling technique, which solves a key problem in performance monitoring in systems where synchronous sampling is not available, such as video switches. Existing works are studied and compared to this work in performance and cost. The proposed …
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Design and Optimization of Four-Dimensional Cone-Beam Computed to mography In Image-Guided Radiation Therapy
… optimization of 4D-CBCT to reduce the impact of undersampling artifacts with short scan times. This work measures the impact of undersampling artifacts on the accuracy of target motion measurement under different sampling conditions and for various object sizes and motions. The results provide a …
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Adquisición de imágenes de resonancia magnética nuclear mediante técnicas de submuestreo
… This Thesis presents and evaluates the use of undersampling to acquire NMR signáis directly at intermedíate frequency or in radio frequency (r.f.) range with the purpose of introducing early in the receiver the potential advantages of the digital signal processing. The application of …
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Magnetic resonance image reconstruction from highly undersampled K-Space data using dictionary learning
… better sparsities and consequently much higher undersampling rates. The proposed alternating reconstruction algorithm learns the sparsifying dictionary, and uses it to remove aliasing and noise in one step, and subsequently restores and fills in the k-space data in the other step. Numerical …
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Predicting Suicide Risk Among Youths Using Machine Learning Methods
… The result showed that RF classifier with undersampling method achieved the highest recall of 0.84, F2 measure of 0.72, and AUROC of 0.85 followed by LR and Ada classifiers.</p> <p>Therefore, I can conclude that RF, LR, AdaBoost are powerful tools for predicting suicidal tendencies in …
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Accelerating magnetic resonance imaging by unifying sparse models and multiple receivers
… aliasing from the reduction in FOV induced by undersampling k-space. However, accelerated parallel imaging reconstruction methods like GRAPPA amplify the noise present in the data, reducing the SNR by a factor greater than that due to only the level of undersampling. Completely separate from …
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On-die signal integrity monitoring of gigabit serial I/Os
This thesis describes an embedded undersampling system for capturing analog wave-forms and monitoring signal integrity throughout a signal path. It is intended for use in Gigabit serial products, such as crosspoints and other networking products. Design reuse and simple components were the most …
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Learning from class-imbalanced data: overlap-driven resampling for imbalanced data classification.
… the classification of imbalanced datasets. Novel undersampling approaches were developed with the main objective of enhancing the presence of minority class instances in the overlapping region. This is achieved by identifying and removing majority class instances potentially residing in such a …
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Use of Predictive Analytics to Identify Risk of Postoperative Complications among the Women Undergoing the Hysterectomy Surgery for Endometrial Cancer
… A model employing PART technique with undersampling gave the best overall performance (F-measure=21.28, G-mean=55.4, and Sensitivity= 60.9) among other models prior to surgery. However, to improve the performance of the developed models, we expanded the study objectives and also …
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Electric field imaging
… processing contribution includes synchronous undersampling, a narrowband, phase sensitive detection technique that is well matched to the capabilities of contemporary microcontrollers. In hardware, the primary contributions are the School of Fish, a scalable network of microcontroller-based …
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Instrument Trade Studies for Satellite Remote Sensing of Ammonia
… time required to obtain an interferogram, having undersampling factors of 2 and 3, respectively. In a large-scale run of microwindowed retrievals using high-resolution model fields of NH3, both sets of specifications were able to perform ammonia retrievals. Due to the use of microwindowing, the …
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Advances in measurements of particle cycling and fluxes in the ocean
… stocks and fluxes in this region are not due to undersampling by traps. To assess regional variability of particle export, surface and water-column measurements of 234Th were combined for the first time to measure fluxes on ~20 km scales. Attempts to relate surface properties to particle export …
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Dynamic Chemical Shift Imaging For Image-Guided Thermal Therapy
… MRTI technique with intentional spectral undersampling which allows relaxed parameters to improve spatiotemporal resolution. An algorithm based on autoregressive moving average (ARMA) modeling is developed and validated to help overcome limitations of Fourier-based analysis allowing highly …
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Advances in measurements of particle cycling and fluxes in the ocean
… stocks and fluxes in this region are not due to undersampling by traps. To assess regional variability of particle export, surface and water-column measurements of ²³⁴Th were combined for the first time to measure fluxes on ~20 km scales. Attempts to relate surface properties to particle export …
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Compact Digital Predistortion for Multi-band and Wide-band RF Transmitters
… implementation and practical concerns of the undersampling DPD which uses lower sampling-rate ADC are then introduced. Finally, the observation bandwidth of DPD systems can be extended by the proposed multi-rate track-and-hold circuits with the associated algorithm. By addressing several …
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