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Traditional avionics systems are federated architecture, and they are gradually replaced by integrated module avionics (IMA), which can share hardware and software resources within one cabinet. As IMA in civil aircraft becomes more popular, the maintenance, safety and supportability have gradually revealed their importance. In order to ensure the safety operation of the system, it is essential to...
This paper proposes two high-resolution Direction-of-Arrival (DOA) estimators using coprime sensor arrays (CSA) processing broadband signals. The product processor estimates the broadband spatial power spectral density (PSD) by averaging narrowband spatial PSD estimates. These narrowband PSD estimates are formed by multiplying one CSA subarray scanned response with the complex conjugate of the other...
Target tracking is a challenging task and generally no analytical solution is available, especially for the multi-target tracking systems. To address this problem, probability hypothesis density (PHD) filter is used by propagating the PHD instead of the full multi-target posterior. Recently, the particle flow filter based on the log homotopy provides a new way for state estimation. In this paper,...
Energy efficiency is essential for Wireless Body Area Network (WBAN) applications because of the battery-operated nodes. Other requirements such as throughput, delay, quality of service, and security levels also need to be considered in optimizing the network design. In this paper, we study the case in which the nodes access the medium probabilistically and we formulate an energy efficiency optimization...
This paper presents two novel designs of SIW H-plane horn antenna which are achieved by adding different double square loops as transition structure. The double square loop and its improvement rotated double square loop are adopted to improve the mismatch between the horn and free space. By optimizing the dimensions of the double square loop structure and rotation angle, the bandwidth performance...
A 4×1 aperture coupled circularly polarized array antenna in ridge gap waveguide technology is presented. The ridge gap waveguide technology is employed to create a desired directional wave propagation. Circular polarization is obtained by introducing L-shaped slot coupling to an oval shaped patch. The simulated results show high circular polarization purity (axial ratio less than 1dB) over the frequency...
In order to take advantage of multi-core hardware, more and more applications are becoming multi-threaded. Unfortunately concurrent programs are prone to bugs, such as data races. Recently much work has been devoted to detecting data races in multi-threaded programs. Most tools, however, require the accurate knowledge of synchronizations in the program, and may otherwise suffer from false positives...
Network life time of Wireless Body Area Network (WBANs) is essential for its operation. An integral part of the network life time is the energy efficiency of the devices and enabling their transmissions with the optimal choice of Physical layer (PHY) and Medium Access Control (MAC) parameters. Particularly, in the next generation wireless networks, where devices and sensors are heterogeneous and coexist...
Large-scale wireless sensor networks (WSNs) often need to be partitioned for efficient data acquisition. To enhance the scalability and reliability of publish/subscribe (pub/sub) systems implemented on a large-scale in WSNs, dedicated broker devices with large storage and computation capacities can be replaced with virtual brokers (VBs), each formed by multiple co-located sensor nodes that shared...
Code-reuse attack is a growing threat to computing systems as it can circumvent existing security defenses. Fortunately, control flow integrity (CFI) is promising in defending such attack. However, former implementations generally suffer from two major drawbacks: 1) complex pre-processing to obtain control flow graph; 2) high overhead. In this paper, we propose a cross-layer approach that employs...
As Convolutional Neural Networks continue to produce state of the art results, more types of data are being used to see the results that would be produced. Using the heart rate data that was collected using sensors from various subjects who consumed alcohol, we converted it from the 1D waveform into a set of spectrograms. The spectrograms were fed into two pretrained CNNs, CaffeNet and AlexNet, to...
We report for the first time the design, fabrication, and feasibility of a high-density cell culture system capable of a cell substrate density of 40 cm2/cm3, greater than 250× current commercially available systems. This design provides oxygen directly from gas perfusable membranes on which the cells are grown to overcome oxygen delivery limitations in traditional culture systems. With translation...
Here we show a new approach to create a sharp tunable microwave bandstop filter. Using a low Brillouin loss of ∼3 dB, we achieved 20-dB extinction filter over a tunable bandwidth of up to 1 GHz with a central frequency tuning range of 16 GHz.
We use the RF analogue of electromagnetically induced transparency (EIT) to demonstrate a high resolution (22 MHz) integrated RF-photonic filter with an enhanced suppression (>30 dB) and an order-of-magnitude amplification in the group delay response. We implement the filter using low-power on-chip stimulated Brillouin scattering.
We use a drop-port geometry to characterize the intracavity waveform of an on-chip microcavity soliton. In contrast to the through-port output, the intracavity field shows efficient power transfer from the pump into the comb.
We compare laser performances of composite YAG/Yb:YAG and bulk Yb:YAG ceramic lasers in chirped-pulse and self-similar amplification, showing excellent power-scaling and pulse-compression properties of the hybrid ceramic master-oscillator fiber amplifier.
Carrier-envelope offset frequency tuning of a microcomb over 25 GHz is demonstrated based on the thermo-optic effect (362.07 ± 4.16 MHz/°C). Thermal response time constants of 30.9 μs and 0.71 ms are observed.
We report the fabrication and characterization of SiN resonators with intrinsic Qs up to 17 million verified with cavity ring-down measurement. Frequency comb generation threshold down to 2.36 mW is consistent with theoretical estimation.
A novel method of measuring the hot-cavity detuning with a high precision is proposed. Characterization of a mode-locked comb related to dark cavity pulse formation in the effective blue detuning region is demonstrated.
Bright and dark pulses were observed respectively at the through and drop ports of a normal-dispersion microresonator, illustrating the impact of a superimposed pump on the time-domain waveform of the output microcomb.
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