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A precise multi-node frequency dissemination scheme for multiple users by feed-forward digital compensation technique is demonstrated. The fractional frequency instabilities of the third-level nodes were measured as 1.79×10−15/s (2.61×10−18/100s) and 1.45×10−15/s (4.58×10−18/100s).
We report on a novel vertical GaN trench structure using PEALD-AlN/GaN hetero-structure for the first time. Through characterizing PEALD-Al2O3/AlN-GaN MOS diode, the measured 2DEG density is as high as 2.7 ×1012 cm−2 located at the AlN/GaN hetero-interface. The vertical 2DEG channel with high electron density and mobility can be achieved by depositing AlN (PEALD) layer after trench etch of N-high...
The set pair evaluation method of surface warship formation operational capability has been proposed based on the set pair analysis theory. The basic ideas and steps of the set pair evaluation method are discussed. Compared with other evaluation methods, the set pair evaluation method is clear in concept, simple to calculate and convenient to operation. Combined with one example, this method is applied...
Ammunition amount is a basic parameter for solving aiming point configuration in future airspace window (FAW). The existing researches only consider the aiming-points configuration (APC) and kill probability calculation when a certain ammunition amount is given, but seldom give attention to the ammunition amount to reach the predetermined kill probability, which is a vital problem for the application...
This paper reports on high performance AlGaN/GaN MISHEMTs with an in-situ SiN gate dielectric. Resulting from the high-quality gate dielectric and dielectric/barrier interface, the MISHEMTs with a gate-drain distance of 15 µm exhibit a high maximum drain current density of 1050 mA/mm, a steep subthreshold slope of 72 mV/dec, and a low gate-drain leakage of 0.6 µA/mm at VGD of −900 V. The high breakdown...
We demonstrate a feed-forward digital compensation scheme in an optical frequency comb based microwave frequency dissemination system over 120-km telecommunication fiber link. The dissemination fractional frequency instability (Λ-counter) was measured at 5.28×10−16/s.
In the actual weapon-target allocation (WTA) problem, weapons can not be randomly paired with incoming targets since their launching zones are limited. Though genetic algorithm (GA) with various modifications has been developed for WTA problems, the spatial constraints are always ignored. In the paper a genetic algorithm (GA) based approach is developed to solve the WTA problem subject to spatial...
We demonstrate feed-forward digital compensation technique applied in both precise frequency transfer and time synchronization. The fractional frequency instability was 6.18×10−20 at 2000 s and RMS variation of time synchronization was sub-40 ps.
This work presents the first fully integrated surface acoustic wave (SAW) oscillator based on AlGaN/GaN structures grown on Si substrates. In addition to the material advantages such as wide-bandgap, and chemical and thermal stability, the use of crystalline III-nitride semiconductors enables a seamless integration of an acoustic device with its peripheral control circuits. The 252-MHz oscillator...
Reported presently are two designs to improve the performance of a “chevron” electro-thermal in-plane actuator. One incorporates beams with uniform cross-sections but nonuniform lengths and tilt angles to accommodate the thermally induced expansion of the “shuttle”; the other incorporates beams with non-uniform cross-sections to achieve a wider spread of the high temperature “expansion” regions of...
An anytime algorithm based on modified genetic algorithm (GA) for dynamic WTA problem, subject to temporal constraints, is developed in the paper. In the algorithm the weapons are assigned to targets one by one before the deadline of each target comes. After a target is assigned with some weapon, the target is replaced by a new one in all chromosomes in the population while the optimization process...
Identification of P2P traffic is very useful for many network management tasks such as application-specific traffic engineering, network planning and monitoring. However, this is a challenging issue because many P2P applications use dynamic port numbers, and deriving signatures that can be used for reliable detection manually is time consuming and difficult. In this paper, we propose a novel approach...
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