In this paper, a ray-tracing technique to predict the propagation channel parameters in indoor scenarios is presented. It is a deterministic technique, fully three-dimensional, based on geometrical optics (GO) and the uniform theory of diffraction (UTD). A model of plane facets is used for the geometrical description of the environment. The ray tracing is accelerated considerably by using the A...

Independent human living systems require smart, intelligent, and sustainable online monitoring so that an individual can be assisted timely. Apart from ambient living, the task of activities plays important role in different fields including virtual reality, surveillance security, interaction with robots. Such have been developed past use various wearable inertial sensors depth cameras to captu...

in this paper, a new propagation model based on utd for multiple diffraction paths in cellular mobile radio communications in urban environments is proposed. moreover, the most rigorous novel utd-based expressions for multiple diffractions by buildings and excess path losses are d - rived and analyzed. for this purpose, building rows are supposed to have rectangular cross-sections with the same...

A ray tracing model based on the application of the uniform theory of diffraction (UTD) and geometrical optics (GO) for modeling the propagation in the microcellular urban scenarios has been implemented. This model has been used to analyze the behavior of the rms delay spread while turning a corner in two street-corner environmentsregular and chaflane street corners. The study of the environmen...

This study aimed to evaluate the utilization and quality of routine immunization (RI) services at a tertiary hospital during second wave COVID-19 pandemic period. An observational analytical was carried out in Immunization Clinic Kathmandu, Nepal. The infant cohort enrolled over period 4 months followed up for year (April 2021 August 2022). Up-to-date (UTD) status, overall vaccine specific drop...

This paper presents a simple model for the evaluation of obstruction caused by multiple buildings in satellite mobile communication systems, or in high-altitude platform (HAP) coverage. The proposed model can be useful for integration into propagation prediction tools. It is based on the KichhoffHuygens formulation, and includes the effect of ground reflections and reflections on a facing build...

The success of supervised deep neural networks (DNNs) in speech recognition cannot be transferred to zero-resource languages where the requisite transcriptions are unavailable. We investigate unsupervised neural network based methods for learning frame-level representations. Good frame representations eliminate differences in accent, gender, channel characteristics, and other factors to model s...

Abstract A high frequency asymptotic technique based on the Uniform Theory of Diffraction (UTD) is employed for building interior imaging. The analysis is implemented using a set of heuristic diffraction coefficients for dielectric wedges and corners with ray-tracing that accounts for multiple through-wall interactions within building. Comparisons with experimental data of the images formed by ...