for an indoor non-directed line of sight optical wireless communication (nlos-owc) system we investigate the optimized lambertian order (olo) of light-emitting diodes (leds). we firstly derive an expression for the olo from a conventional lambertian led model. then, we analyze the indoor multi-cell nlos-owc channel characteristics including the optical power distribution and the multipath time ...

The phenomeal increases in the generation, processing, and transmission of digital images have created increasing demands on the storage capacities, the processing speeds, and on the bandwidth of communication. Typical applications include teleradiology, digital libraries, satellite imagery for earth resources, multimedia databases, and several others. Lossy image compression techniques enable ...

In this study, we show that robust and tunable acoustic asymmetric transmission can be achieved through gradient-index metasurfaces by harnessing judiciously tailored losses. We theoretically prove that the asymmetric wave behavior stems from loss-induced suppression of high order diffraction. We further experimentally demonstrate this novel phenomenon. Our findings could provide new routes to ...

The sensitivity of a high frequency electron spin resonance (ESR) spectrometer depends strongly on the structure used to couple the incident millimeter wave to the sample that generates the ESR signal. Subsequent coupling of the ESR signal to the detection arm of the spectrometer is also a crucial consideration for achieving high spectrometer sensitivity. In previous work, we found that a means...

PURPOSE Metallic implants may cause serious tissue heating during magnetic resonance (MR) imaging. This heating occurs due to the induced currents caused by the radio-frequency (RF) field. Much work has been done to date to understand the relationship between the RF field and the induced currents. Most of these studies, however, were based purely on experimental or numerical methods. This study...

Lossy VASS (vector addition systems with states) are deened as a subclass of VASS in analogy to lossy FIFO-channel systems. They can be used to model concurrent systems with unreliable communication. We analyze the decidability of model checking problems for lossy systems and several branching-time and linear-time temporal logics. We present an almost complete picture of the decidability of mod...

With the rapid growth of indoor wireless communication systems, the need to accurately model radio wave propagation inside the building environments has increased. Many site-specific methods have been proposed for modeling indoor radio channels. Among these methods, the ray tracing algorithm and the finite-difference time domain (FDTD) method are the most popular ones. The ray tracing approach ...

In this paper, the ways to improve the functionality and reliability of Digital Signal Processors, used to support optical networks, have been studied. Specifically, supported on our finding from previous experimental studies that on-die global interconnects should be described by a distributed RLC model, we propose to model shielded lines, carrying the most critical signals, by a Lossy Transmi...

Acknowledgements Working in the excellent research environment of the International Computer Science Institute at Berkeley has been an unforgettable experience and I am grateful to everybody who supported my studies abroad. First of all, I would like to thank Hartmut Chodura, my research advisor, for organizing my stay at the International Computer Science Institute and for his encouragement an...

In this paper we present a comprehensive mathematical analysis of the energy dissipated in deep sub-micron (DSM) buses. The estimation is based on an elaborate bus model that includes all the distributed and lumped parasitic elements that appear as technology scales. The energy drawn from the power supply during the transition of the bus is evaluated in a compact closed form. The notion of acti...