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This paper investigates the network function virtualization (NFV)-enabled multicast problem, and proposes a steiner tree-based algorithm to reduce the cost of virtual network function (VNF) deployment and routing. In the algorithm, to minimize the bandwidth consumption, the Steiner tree is constructed by taking all the destination nodes as the terminals. Then a interconnection node of the tree is...
Listen-Before-Talk category 4 (LBT Cat4) mechanism is considered as the most appropriate access method for Licensed-Assisted Access (LAA) framework, especially when LAA system coexists with WiFi system in unlicensed bands. Previous investigations of the LBT Cat4 based LAA-WiFi coexistence provide experimental results and simulation results, and theoretical analysis work is relatively rare. This work...
The goal of this paper is to expand from previously researched liquid metal linear array models into a dynamically driven two dimensional liquid metal array. Simulations were performed using FEKO to prove the concept that a multi-dimensional array will provide the user more control over the direction of the main beam and also the direction of the nulls, making the resulting array useful for spatially...
Communication traffic continue to improve due to the rapid growth in broadband access in recent years, frequently based on PIN or tunnel devices. The present paper discuses two kind of tunnel devices, in a vertical configuration through the cross-section, allowing the tunnel current flow from upper anode to bottom cathode: PIN and NOI device in a planar technology (p-NOI). Recently, the NOI — Nothing...
Progresses obtained in command and power electronics have increased the technical and economic performances of brushless direct current motors. Consequently, the problem of optimum design and operation of these motors, frequently used for driving small vehicles, is a very present one. Studies presented in literature show that high oscillations of torque occur in these motors in a complete rotation...
Sophisticated cyber attacks by state-sponsored and criminal actors continue to plague government and industrial infrastructure. Intuitively, partitioning cyber systems into survivable, intrusion tolerant compartments is a good idea. This prevents witting and unwitting insiders from moving laterally and reaching back to their command and control (C2) servers. However, there is a lack of artifacts that...
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...
The specific problems of the disconnection of HVDC breakers need an analysis of performances at laboratory scale. In the study of hybrid circuit breakers with commutation, three steps are necessary: modeling, simulation and experimental tests. The paper presents a modeling procedure for a hybrid commutation breaker intended to operate using resonant circuits phenomenon. Using the Matlab platform,...
As cloud computing continues to gain momentum, big data analytics are now offered as Software as a Service (SaaS). Besides the heterogeneity and multi-tenancy of the underlying virtualized environment, scheduling such real-time, data-intensive, embarrassingly parallel applications in a SaaS cloud involves another serious challenge: data locality. Consequently, data-aware scheduling policies should...
This paper presents an analysis for the electromagnetic interference (EMI) related common-mode (CM) noise in differential high-speed data links with different signal modulation schemes, e.g. non-return-to-zero (NRZ) and 4-level pulse amplitude modulation (PAM-4). The CM noises, introduced by the mismatch of data rising and falling edges in both cases, exhibit the similar positive correlation with...
In this work, an automatic gain control amplifier for high voltage spindle recording is proposed. It is composed of a fix-gain amplifier and a variable gain amplifier (VGA) with threshold detecting logic to control the gain of VGA. The system provides 3 different gain set: 54dB, 60dB and 66dB. The bandwidth of the system covers from 0.5Hz to 1.5 KHz. The power is 7.7uW, and the integral input referred...
A new technique to reduce the clock jitter effect on single-bit continuous-time delta-sigma modulators (CTDSM) is proposed. It utilizes a delay line to generate N highly correlated clock sources to reconstruct the feedback waveform. Theoretical analysis show that the jitter-induced random noise power is reduced by a factor of 1/N2. Simulation results confirming the analysis are reported.
Based on the single wheel vehicle model, a sliding mode variable structure control strategy with fractional exponential reaching law is proposed for the ABS control system. In this paper, the integral sliding mode surface is used to design the switching function, and the fractional exponential reaching law is designed by using the definition and properties of fractional exponential differential equations...
This paper is concerned with the fault diagnosis of three-phase full-bridge rectifier. A new approach is proposed to extract the fault features in both frequency and time domain. The integrated features are used for the training of an LM-BP neural network, which is then applied for the fault classification. The simulation experiments are implemented on the fault diagnosis model built in MATLAB/Simulink,...
In this paper, a vertical physical-layer network coding (VPNC) scheme based pulse amplitude modulation (PAM) for two-way relay channel (TWRC) is proposed. Different from the conventional physical layer network coding (PNC) scheme in which the relay superimposes two users' signals of the same constellation, in the proposed VPNC scheme two users transmit PAM signals with vertical constellation and the...
This paper presents a guidance law design for synchronized path following of multiple underactuated unmanned surface vehicles (USVs) without using a global reference velocity. Firstly, a distributed observer is proposed to eliminate the need of reference velocity known to all the vehicles. Secondly, a line-of-sight based guidance law is derived to force each vehicle to follow a parameterized path...
Recursive projection twin support vector machine (PTSVM) and Locality preserving projection twin support vector machine (LPPTSVM) are two extensions of traditional support vector machine (SVM). However, they may lead to a weak classifier in the application where some data points may not be fully assigned to one class. In this paper, we introduce the basic idea of fuzzy membership into LPPTSVM and...
In this paper, quadrotor with air drag is locally asymptotically stabilized by using controlled Lagrangians method. Three linear subsystems are got by conducting input transformations, linearization at the desired equilibrium, and invertible state transformations to dynamical model of quadrotor. Then subsystem with two under-actuation degrees is asymptotically stabilized by utilizing controlled Lagrangians...
The large-scale un-coordinated charging electric vehicles(EV) will reduce the quality and reliability of power grid significantly. Centralized control can achieve the coordinated charging of EV. But cost of construction and maintenance of control system is increasing with the development of EVs. For the scattered distribution of EV, distributed control is more convenient to be realized. A coordinated...
As one of automotive engine's important working states, idle-speed has much relation to the engine's fuel consumption and exhaust-gas pollution level. Effective idle speed control (ISC) can improve fuel economy and reduce exhaust emissions, the principal operation of ISC is to uphold the actual engine speed very close to the set point value when any disturbance is added. Automotive engines are typical...
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