نتایج جستجو برای: random undersampling
تعداد نتایج: 284925 فیلتر نتایج به سال:
Target Audience: MR researchers and clinical scientists working on fast acquisition. Purpose: Random undersampling is an important component used with Parallel Imaging 2 (PI), Compressed Sensing (CS) and their combination (PI-CS) for fast acquisition. Optimized pseudo-random trajectory results in better reconstruction yet the computation complexity of optimizing undersampling trajectory prevent...
In lung cancer computer-aided detection/diagnosis (CAD) systems, classification of regions of interest (ROI) is often used to detect/diagnose lung nodule accurately. However, problems of unbalanced datasets often have detrimental effects on the performance of classification. In this paper, both minority and majority classes are resampled to increase the generalization ability. We propose a nove...
Differentiating between different types of neurodegenerative diseases is not only crucial in clinical practice when treatment decisions have to be made, but also has a significant potential for the enrichment of clinical trials. The purpose of this study is to develop a classification framework for distinguishing the four most common neurodegenerative diseases, including Alzheimer's disease, fr...
1. Frequency of singletons - species represented by single individuals - is anomalously high in most large tropical arthropod surveys (average, 32%). 2. We sampled 5965 adult spiders of 352 species (29% singletons) from 1 ha of lowland tropical moist forest in Guyana. 3. Four common hypotheses (small body size, male-biased sex ratio, cryptic habits, clumped distributions) failed to explain sing...
Frequency estimation of multiple sinusoids is significant in both theory and application. In some application scenarios, only sub-Nyquist samples are available to estimate the frequencies. A conventional approach is to sample the signals at several lower rates. In this paper, we address frequency estimation of the signals in the time domain through undersampled data. We analyze the impact of un...
It has now been demonstrated in many studies that network traac exhibits properties consistent with Long Range Dependence (LRD) and self-similarity. While theoretical frameworks are currently being developed to estimate the performance of such systems, simulation will remain a valuable tool for validating these theoretical models, and providing insight into systems which are too complicated to ...
This paper presents a multi-mode Software Defined Radio receiver based on a bandpass sampling receiver. Our aim is to develop a receiver that can provide a high bandwidth of reception in order to do the demodulation of several wireless standards signals accomplishing each of the required specifications, only using a single radio front-end.
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