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In this paper, a distributed fiber sensing system based on Stimulated Brillouin scattering (SBS) effect is experimentally studied. Using Brillouin optical correlation domain analysis, the spatial resolution was affected by the reference frequency and the sideband component suppressed in the probe. The lower side band and the central wavelength was filtered by a fiber Bragg grating (FBG). We adjusted...
Recently, advanced control methods like machine leaning are increasingly applied to autonomous vehicle. This paper focuses on velocity control in a right-turn traffic scenario. A Markov Decision Processes(MDPs) is modeled and the actor-critic reinforcement learning architecture is employed. Then the kernel-based least squares policy iteration algorithm(KLSPI) is applied. Simulation results show that...
We present a click-element-based asynchronous loop structure for control path of asynchronous micro-control unit (MCU). The loop, which has one-stage control circuit instead of cascade circuits, can be triggered by only one trigger signal and stopped by a preset number. To verify the loop structure, we design an asynchronous MCU simulated in FPGA. The experimental results show that the MCU can be...
This paper presents a support vector machine (SVM) based model predictive control (MPC) strategy to manage the engine speed to the set-point of idle speed. The predictive model is trained by SVM due to its accuracy of learning nonlinear process, simple training program and no over-fitting nature. To reduce the computational burden of controller and retain the dynamic information of system, the instantaneous...
Based on the great development of engine technologies and the expansion of engine fuel economy area, a simulated engine Break Specific Fuel Consumption (BSFC) map is obtained. Then, for the paralleled hybrid vehicle, Dynamic Programming algorithm is adopted to research the effect of engine on the gearbox gear numbers. Finally, the simulation results show that on the new engine BSFC map, the fuel consumptions...
Distribution grid simulation is important method to related department for the distribution grid planning, design, testing, operation and experiment. It is common method of the distribution grid protection, measurement and control equipment function test and distribution grid automation system function test. Distribution grid simulation can be divided into real-time simulation and non-real time simulation...
The inductively coupled coil in wireless power transfer (WPT) system is the key to optimizing the power transfer efficiency. Based on an iterative printed spiral coil (PSC) design procedure, this paper proposes a load-based design method to improve the efficiency stability for a load-variable system. The efficiency stability coefficient is defined to choose the optimal PSCs. Several pairs of PSCs...
High-bandgap offset 1300nm InAlGaAs quantum well (QW) has been used for electroabsorption modulator. High conduction/valance bandgap offset ratio allows strong exciton effect under high electric field, leading to broadband operation. >10dB extinction ratio from 1280nm to 1320nm and 40GHz of electical-to-optical response has been demonstrated.
This paper presents a 28Gbps voltage controlled oscillator (VCO) based clock and data recovery (CDR) with a separate proportional path technology. It employs a quarter rate ternary Bang-Bang phase detector to extract the phase error between the local clock and input data. The circuit designed in a 65nm CMOS process achieves ±1000 ppm lock-in rang, ±6000 ppm tracking range. The simulation results show...
The rapid growth of traffic demands has posed challenges and difficulties on both the radio access networks (RANs) and the backhaul links. To stress these problems, caching technology, more specifically, caching user contents at the infrastructures of different RANs is proposed as an effective approach. In this paper, we consider the joint user association and cache content placement problem in cache-enabled...
The accurate information of vehicle states that could not be obtained directly by onboard sensors is virtual important for vehicle active safety systems. This paper presents the nonlinear full-order observer which is used to estimate the longitudinal velocity, lateral velocity and road grade estimation with autonomous driving. Firstly, this paper established a simplified vehicle dynamics model for...
A nonlinear reduced-order vehicle velocity observer based on vehicle dynamics is proposed. Firstly, the longitudinal force of the tire is obtained by cascade tire-force estimation method based on the sliding mode observer, and the results are verified. Then, based on the simplified three-degree-of-freedom vehicle model, a nonlinear reduced-order observer with yaw rate as the correction term is designed...
Equivalent consumption minimization strategy is one of the most promising strategies that can be used in real-time. However, the challenge of this strategy is the determination of the equivalence factor since it is related to the driving cycle that a vehicle follows. In this paper, based on a given driving cycle, the optimal equivalence factor is calculated by using dynamic programming algorithm and...
With a growing number of magnetic resonance-guided high-intensity focused ultrasound (MR-HIFU) clinical applications, acoustic field characterization tools and methods for quality assurance are needed to ensure safe treatment outcomes. However, the established methods typically use equipment that cannot be used in a magnetic resonance imaging (MRI) suite. Herein, we propose a technique for convenient...
At present, the lack of actual operation experience of the intelligent substation secondary system results in indeterminate maintenance strategy, time-consuming and laborious routing inspection, blindness in maintenance work and some other issues. Based on this, a comprehensive evaluation system of the operation quality of the secondary system is realized firstly. Secondly, the utility function is...
This study researched the visual comfort and visual fatigue between two kinds of phone screen, one was antireflection film and the other was no reflection film under the simulate normal outdoor visual environment, combined with critical fusion frequency (CFF), visual search task, electroencephalogram (EEG) and subjective perception scale of visual fatigue. 20 participates participated in the experiment...
This paper presents a practical evaluation method for the operation quality of smart substation secondary equipment. The evaluation method includes evaluation index system, evaluation model and evaluation process. Taking full account of the main factors which affect the operation quality of smart substation secondary equipment, the veto index is proposed and a relatively complete evaluation index...
A new optical fiber probe based on in-line silicon microsphere cavity Fabry-Pérot interferometer (FPI) was demonstrated for refractive index sensing applications with a sensitivity about −5.326±0.223/RIU.
III-nitrides InGaN solar cells have exhibited many favorable physical properties for space photovoltaic (PV) applications. Here we demonstrate the first nonpolar and semipolar InGaN/GaN multiple-quantum-well (MQW) solar cells grown on nonpolar m-plane and semipolar (2021) plane bulk GaN substrates. The optical properties and PV performance of these InGaN solar cells were systematically studied, including...
With high expansibility of sensor electronic devices, wireless sensor networks have attracted more and more attention. The k nearest neighbors (k-NN) query has become a significant part of sensor networks due to its availability and convenience. However, it is an important but challenging problem to keep privacy and security while still maintaining low energy consumption. In this paper, we address...
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