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Recently, 802.11ah with restricted access window for collision attenuation has been proposed for Internet of Things (IoT) applications. Random grouping of nodes in different access window is utilized to reduce the hidden node collision probability. However, when the coverage area of the sink node is large, the occurrence probability of hidden node problem is still high and severely impacts the system...
Diffusion magnetic resonance imaging (dMRI), including diffusion tensor imaging (DTI) and various high-angular-resolution imaging (HARDI) techniques, has been widely used in the research of neuroscience and clinical applications. With the development of new acquisition and imaging schemes, numerous novel post-processing methods are also proposed. However, it remains unclear whether the newly proposed...
The Embedded die in substrate (EDS) market has grown significantly over the past several years and it is now one of the fastest growing packaging technologies in the semiconductor industry driven by smaller form factor, better heat dissipating, low noise emission, higher levels of integration and better performance. In addition, for power management and mobile-wireless application the embedded technology...
A potential technology by substrate interposer enables high bandwidth and low power application processing devices of the future, because the demand of smart mobile products are driving for higher logic-to-memory bandwidth (BW) over 30 GB/s with lower power consumption and ultra-capacity of memory. This paper presents a new High Bandwidth Package-on-Package (HB-PoP) structure with substrate interposer...
In-vivo three-dimensional (3D) DTI acquisition of an entire human heart for a complete cardiac cycle is currently technically impossible. We propose an alternative to this problem by simulating DTI of dynamic cardiac fiber structures. We first model a virtual dynamic cardiac fiber structure by integrating cardiac motion information into an ex vivo referential cardiac fiber structure and then use a...
The effect of channel estimation error on the performance of the interleave-division multiple access (IDMA) systems are studied in this paper. For comparison, a channel estimation approach based on expectation maximization (EM) algorithm is also presented. The theoretic analysis and simulation results show that the variance of the channel estimation error affects the bit-error-rate (BER) performance...
Characterizing the transient behavior of queueing systems is a difficult problem, which has been addressed by either simplified analytical models or simulation. We seek to capture the transient performance of systems from a new perspective: based on high-fidelity simulation experiments, we estimate a number of transfer function models (the discrete approximations of those ODEs provided by an analytical...
In this paper, we study the problem of adaptive retrieval of multiple sinusoids in white noise. It is shown that frequency estimation problem can be reformulated as an unconstrained optimization problem. Based on the proposed cost function, we derive a new adaptive quasi-Newton algorithm for tracking frequencies by approximating Hessian matrix appropriately, which not only significantly reduces the...
Computer simulation is an appealing approach for the reliability analysis of structure-based software systems as it can accommodate important complexities present in realistic systems. When the system is complicated, a screening experiment to quickly identify important factors (components) can significantly improve the efficiency of analysis. The challenge is to guarantee the correctness of the screening...
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