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Frequency stability is the main index of the stable operation of power system, frequency deviation too large or lasted long will resulted in electrical equipment abnormal operation or failure. Usually through primary frequency regulation and secondary frequency regulation make electricity power balance, eventually reached a stable frequency. With the popularity of electric vehicles, electric energy...
With the rapid development of modern wireless communication systems, the visible light communication system using LED becomes popular due to the higher transmission speed and more reliable QoS. In this paper, we analyze the principle of VLC communication systems and make a field trial simulation using the single chip machine. The analysis of VLC indicates that the VLC communication system could help...
A transmitter with an output frequency range from 341 to 386 GHz is presented. Power output varies from 0.1 to -15.8 dBm along its operating range, while it remains above -2.9 dBm from 341 to 353 GHz. The high-frequency signal is generated using a wideband push-push voltage-controlled oscillator (VCO) with coarse and fine frequency tuning control, a 3-stage power amplifier, and a frequency doubler...
In order to realize the functional requirements of hydraulic cylinder installing in the leg of the rehabilitation robots, a new type of servo rotary valve was designed with an introduction of its structure. The spool in rotary valve may have different locations when the actual working conditions are different. To know the flow field of rotary valve above case we have done a thorough numerical analysis...
The K-Nearest Neighbor (K-NN) algorithm is one of the most common classification algorithms and widely used in pattern recognition and data mining. K-NN hardware acceleration is necessary for applications with massive high-dimensional data. High level synthesis (HLS) is an increasingly adopted technique in digital circuit design, which can help to raise the abstraction levels. In this paper, we exploit...
As an important part of DRM, key management technology has been widely used in protecting various copyrights, including industries such as digital television technologies. With the development of all kinds of technologies, the key management scheme has been developed and evolved within which the key distribution also has a variety of forms like unicast and multicast. In this paper, a key management...
With the security situation in Cyberspace constantly becoming worse, Cyber threat detection has attracted a lot of researching attentions. In this paper, existing detection technologies are firstly reviewed. Secondly, a framework of capturing the abnormal traffic of botnets is proposed. Major modules and key detection techniques are presented at the same time. The hidden threat detection in physically...
A plane problem of a moving crack with constant velocity in piezoelectric materials is investigated systematically. Based on the extended Stroh formalism, the closed-form expression of electric displacement in the moving crack, the electrostatic fields and dynamic stress and dynamic electric intensity factors are obtained in a concise form. The influence of Maxwell stresses and the speed of the crack...
A power converter supplying kilo-watt-power from its output side is developed in this paper. The composition of its power-stage includes an AC-DC converter and a DC-DC converter. The topology used by the DC-DC converter is the phase-shifted full-bridge with parallel current-doubler rectification converter (PSFB-PCDRC). For the sake of feedback controller design, the small-signal model of PSFB-PCDRC...
The present work studies the influence of Maxwell stress on a straight but non-linear polarization saturation (PS) crack in a 2D piezoelectric material under combined mechanical and electric loadings at infinity. The non-linear piezoelectric fracture mechanics model, which is the PS model, is adopted in this paper. It is assumed that the crack is electrically semi-permeable. Based on the Stroh's formalism...
A fundamental 229–240 GHz voltage-controlled oscillator (VCO) driving directly a divide-by-8 dynamic frequency divider chain is presented. To our best knowledge, this is the highest reported fundamental VCO integrated with a frequency divider in silicon. Furthermore, the high-frequency divider operational range up to 240 GHz is a record value for dynamic dividers in silicon. The down-converted signal...
In this paper, we study the problem of joint multiple-input multiple-output (MIMO) amplify-and-forward (AF) relaying and artificial noise (AN) optimization for secure communication between a source-destination pair in the presence of multiple eavesdroppers (eves). The eves' channel state information (ECSI) is subject to arbitrarily distributed random errors. Assuming that only the first and second...
GIS has excellent performance and is widely used in electric power system. Its delivery test usually is standard impact which is applied in examination of its insulation, but in the field test, the oscillating impulse voltage waveform is often used. So the assessment ability in SF6 insulation of oscillating impulse voltage and the equivalent relation of two types impulse voltages is worthy of further...
Because of its excellent performance, GIS is widely used in GRID. After produced, manufacturers will assess the insulation of GIS by LI. On the other hand, the power sector will use OLI for on-site testing. The distribution of breakdown voltage on the nodes inside GIS induced by OLI or LI is the base of test result analysis. In order to master the distribution under the two impulses, in this paper,...
The major obstacles that limit the success of delivery chemotherapeutic substances in brain tumors is their ability to reach the lesion at necessary doses while minimizing deposition at healthy locations to reduce nonspecific toxicity. Lately, administration of therapeutic substances after blood-brain barrier disruption (BBBD) by microbubbles (MBs) with focused ultrasound (FUS) has been demonstrated...
A 3-stage power amplifier (PA) with 14dBm saturated output power (Psat), 29.5 dB small-signal gain, and 4.8% power-added efficiency (PAE) at a frequency of 162GHz is presented. From 155 to 165 GHz, Psat remains higher than 12.5 dBm, while the small-signal gain varies from 35.4 dB to 28.3 dB. Maximum output power and gain performance are obtained by using a differential cascode topology and operating...
Online learning, from birth to now, has become a more dynamic research area. Online learning is a way of learning that student as the main body, teacher as the main leader, however, due to the space and time separation between teachers and students in online learning, it is difficult to grasp the level of student engagement in the learning process. "No engagement, no learning", even if there...
Existing multi-hypothesis (MH) prediction algorithms in compressed video sensing (CVS) are all deployed in measurement domain, which restricts the flexibility of block partitioning in the reconstruction process and decreases the reconstruction accuracy. To address this issue, this paper proposes a two-stage multi-hypothesis reconstruction (2sMHR) scheme which deploys the MH prediction in measurement...
A subwavelength silicon nanoposts array featuring high bending efficiencies in the wavelength of 1480–1600 nm are demonstrated. The compactness, low loss, and CMOS compatibility enable the structure a promising component for on-chip optical control.
V-band gapless OFDM RoF system with power detector down-conversion is proposed. We propose and successfully employ a novel Volterra nonlinear compensation to mitigate signal-to-signal beating interference, resulting in 22% data rate improvement with bit-loading algorithm.
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