Structure analysis of single- and multi-frequency subspace migrations in inverse scattering problems

In this literature, we carefully investigate the structure of single- and multi-frequency imaging functions, that are usually employed in inverse scattering problems. Based on patterns of the singular vectors of the Multi-Static Response (MSR) matrix, we establish a relationship between imaging functions and the Bessel function. This relationship indicates certain properties of imaging functions and the reason behind enhancement in the imaging performance by multiple frequencies. Several numerical simulations with a large amount of noisy data are performed in order to support our investigation.Comment: 11 pages, 10 figure

Applications of Monte Carlo Methods in Statistical Inference Using Regression Analysis

This paper studies the use of Monte Carlo simulation techniques in the field of econometrics, specifically statistical inference. First, I examine several estimators by deriving properties explicitly and generate their distributions through simulations. Here, simulations are used to illustrate and support the analytical results. Then, I look at test statistics where derivations are costly because of the sensitivity of their critical values to the data generating processes. Simulations here establish significance and necessity for drawing statistical inference. Overall, the paper examines when and how simulations are needed in studying econometric theories

Purchase Intention for Luxury Wellness Brands: Assessing the Predictive Value of Brand Awareness versus Brand Attachment

Despite consumers\u27 pursuit of wellness in luxury consumption, little research has been done regarding the simultaneous impact of cognitive and relational variables on luxury buying behavior. As an attempt to address this void, this study is designed to investigate how brand awareness (cognitive) and brand attachment (relational) are interrelated and contribute to purchase intention for luxury wellness brands. Specifically, our study centered on the following research questions: ¢ RQ1: Does brand awareness predict purchase intention for luxury wellness brands? Does brand awareness explain a significant amount of the variance in purchase intention when controlling for the possible effects of demographic characteristics (i.e., age, education)? ¢ RQ2: Is brand attachment a necessary construct to explain purchase intention for luxury wellness brands? Do consumers intend to purchase a wellness luxury brand although they do not feel attached to it

Serial Magnetic Resonance Imagings of Multiple Brain Abscesses in a Patient with Pneumococcal Meningoencephalitis

We report a 43-yr-old man manifesting bacterial meningoencephalitis and multiple abscesses by Streptococcus pneumoniae. Serial magnetic resonance (MR) imagings and MR spectroscopy showed the evolution of multiple brain abscesses over 4 weeks: the enhanced rings became thicker and the dimension of whole lesions larger despite shrinkage of the ring-enhanced regions. These findings may be evidence of active inflammation working to sequestrate the lesion and protect the surrounding normal brain parenchyma from additional damage, even in the final stage of the brain abscess