Diffraction phenomena studied in electromagnetism, acoustics, and elastodynamics are often modeled using integrals, such as the well-known Sommerfeld integral. The far field asymptotic evaluation of such integrals obtained using the method of steepest descent leads to the classical Geometrical Theory of Diffraction (GTD). It is well known that the method of steepest descent is inapplicable when...

In this study, the impact of finite ground plane edge diffractions on the amplitude patterns of aperture antennas is examined. The Uniform Theory of Diffraction (UTD) and the Geometrical Optics (GO) methods are utilized to calculate the amplitude patterns of a conical horn, and rectangular and circular waveguide apertures mounted on square and circular finite ground planes. The electric field d...

The phased beam tracing method (PBTM), which introduces the phase information into the geometrical acoustic technique, has a definite advantage in simulating the interference of waves at medium frequencies in an enclosed space. Generally, the diffraction effect cannot be included due to the straight propagation of triangular beams. However, the diffraction should be considered in, particularly,...

The shadow of diffraction, which account for the growth of trees based on wireless sensors and automatic acquisition of environmental information, were presented to meet the requirements for a wireless sensor network in a forest. there’s a necessity to avoid the dead zone of signal diffraction when laying wireless sensor in the forest, the integration of SBR and UTD is applied to study the impa...

The successful completion of early childhood immunizations is a proxy for overall quality of early care. Immunization statuses are usually assessed by up-to-date (UTD) rates covering combined series of different immunizations. However, series UTD rates often only bear on which single immunization is missing, rather than the success of all immunizations. In the US, most series UTD rates are limi...

Recognizing human activity plays a significant role in the advancements of human-interaction applications healthcare, personal fitness, and smart devices. Many papers presented various techniques for representation that resulted distinguishable progress. In this study, we conduct an extensive literature review on recent, top-performing recognition based wearable sensors. Due to lack standardize...

T ^ H E METHOD of duct management that X is optimal for pancreatic (P) transplantation (Tx) continues to be a major controversy. An analysis of the Pancreas Transplant Registry shows no differences in results for the three major duct management techniques, polymer injection, enteric drainage, and urinary tract diversion (UTD). All techniques have advantages and disadvantages. Duct injection is ...

We explore the problem of translating speech to text in low-resource scenarios where neither automatic speech recognition (ASR) nor machine translation (MT) are available, but we have training data in the form of audio paired with text translations. We present the first system for this problem applied to a realistic multi-speaker dataset, the CALLHOME Spanish-English speech translation corpus. ...

Audio transcriptions from Automatic Speech Recognition systems are a continuous stream of words that are difficult to read. Segmenting these transcriptions into thematically distinct stories and categorizing the stories by topics increases readability and comprehensibility. However, manually defined topic categories are rarely available, and the cost of annotating a large corpus with thousands ...

Ray tracing algorithms rely on two dimensional or three dimensional database. They use ray optical techniques referred to as the uniform theory of diffraction (UTD) using building database given as polygons. Building geometries can also be modelled as having non-planar geometries, and this would be important in modeling of shadowing loss due to curved structures in urban radio propagation. To d...