We present an algorithm for interactive computation of diffraction paths for geometric-acoustics in complex environments. Our method extends ray-frustum tracing [Lauterbach et al. 2007] to efficiently compute volumetric regions of the sound field caused by long diffracting edges. We compute accurate diffraction paths from each source to the listener and based on the Uniform Theory of Diffractio...

We apply Preuss' concept of $mbbe$-connectedness to the categories of lattice-valued uniform convergence spaces and of lattice-valued uniform spaces. A space is uniformly $mbbe$-connected if the only uniformly continuous mappings from the space to a space in the class $mbbe$ are the constant mappings. We develop the basic theory for $mbbe$-connected sets, including the product theorem. Furtherm...

A generalisation of the Gaussian doubly dirty multiple access channel to a Gaussian triply dirty multiple access channel (GTD-MAC) is considered, where there are three additive interference signals, each one non-causally known to only associated transmitter. Same as in the Gaussian doubly dirty multiple access channel, Costa’s strategy (i.e. random binning scheme) cannot achieve positive rates ...

In this paper 2D and 3D ray-tracing-predictions based on UTD are compared to measurements in urban microcellular environments characterized by an irregular mixture of building heights due to the presence of relatively high rise buildings. It is shown that the 2D ray-tracing underestimates the measurement in area far from the transmitter. The theoretical study and the preliminary comparisons wit...

[Acknowledgment] This research was supported in part by the National Science Foundation (CAREER SES 0552089), UTD Provost’s Distinguished Professorship, Brain Korea 21 Project, and Ohio State University CIBER and Center for East Asian Studies. Earlier versions were presented at the 8th Conference on the Theories and Practices of Securities and Financial Markets (Kaohsiung, 1999), Conference on ...

Recently, the rapid development of inexpensive RGB-D sensor, like Microsoft Kinect, provides adequate information for human action recognition. In this paper, a recognition algorithm is presented in which feature representation is generated by concatenating spatial features from human contour of key frames and temporal features from time difference information of a sequence. Then, an improved m...

Placental site trophoblastic tumor (PSTT) is the rare variant of gestational trophoblastic diseases (GTD), which differs histologically and immunologically from GTD. Diagnosis of PSTT is often difficult and delayed. In most cases, diagnosis is not possible until the surgery is performed. The most therapeutic choice is hysterectomy and it is usually successful. Here we report two cases of

The geometrical theory of diffraction (GTD) as formulated by R. G. Kouyoumjian has been applied to predict the radiation characteristics of hyperboloidal subreflectors with laterally defocused feeds. In caustic or multicaustic directions the scattered fields are. determined AZIMUTH ANGLE Fig. 7. Smoothed theoretical and measured radiation patterns of pyramidal horn reflector antenna with blinde...