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Background: Cloud based integrated development environments (IDEs) are rapidly gaining popularity for its native support and potential to accelerate DevOps. However, there is little research of how developers behave when interacting with these environments. Aims: To develop empirical knowledge about how developers behave when interacting with cloud based IDEs to deal with programming tasks at various...
Hybrid electric vehicles are one of the most practicable technologies in the automobile industry to conserve resources and to protect the environment. Mode transitions between different modes are critical to improve fuel economy and driving performances. Due to the response delay of the engine and the engagement of the clutch, smooth transitions are sometimes difficult to achieve. Fuzzy sliding mode...
The research shows that primary pipe network leak will cause the fluctuations of temperature and conductance around the leak point. There is a complex non-linear relationship between the pipeline leakage and physical quantity, and the leakage of the pipeline can not be assessed by the change of the single physical quantity. In this paper, the assessment model of the leakage degree of the pipe network...
To deal with randomness and uncertainty problems, an adaptive discontinuous Galerkin time domain (A-DGTD) method is proposed to quantify the influence of defect factors. In order to prove the efficiency of the method, the standard statistical analysis is performed to calculate the mean of reflection coefficients caused by random/uncertain physical parameters on a dielectric slab.
This paper proposes a sensorless speed control method combining sliding mode observer (SMO) and model reference adaptive system (MRAS) for the surface permanent magnet synchronous motor drives. This hybrid method can guarantee the convergence of both speed and position estimation simultaneously. In order to eliminate the torque fluctuations and mitigate the influence of harmonic components in the...
In this paper a double square loop switchable metamaterial absorber based on active frequency selective surface (AFSS) is introduced. The design of AFSS structure is comprised of periodically arranged square loops with PIN diodes. There are four states simulation results can be presented by controlling the bias voltage of the PIN diodes, and the method for the design of feeder circuits is probe-fed...
In this paper, the influences of system parameters on stochastic resonance output effect is analyzed, which takes the multi-stable stochastic resonance system as the model. That is, the vibration condition of multi-stable stochastic resonance system, and weak signal detection method based on the multi-stable stochastic resonance under α stable noise is investigated. Then considering the real-time...
Secure communication in Heterogeneous cellular networks (HCNs) is of primary importance due to the fact that the fifth generation (SG) wireless networks aim to achieve high level of security. Different from previous works, we study the physical layer security (PLS) performance jointly considering the randomness of base stations in spatial dimension and user equipment (UE) arrival and departure processes...
Computing frameworks have been widely deployed to support global-scale services. A job typically has multiple sequential stages, where each stage is further divided into multiple parallel tasks. We call the set of all the tasks in a stage of a job a cotask. In this paper, we aim to minimize the average Cotask Completion Time (CCT) in cotask scheduling. To the best of our knowledge, there is no prior...
Here, we demonstrate an ultrasensitive olfactory system, namely, a bioelectronic nose (B-nose), based on CMOS-compatible silicon nanowires (SiNWs) conjugated with an odorant-binding protein (OBP). The SiNWs were low-cost and top-down fabricated with a conventional microfabrication process by using a novel controllable size-reduction process. The OBP-SiNW devices detect vapor analytes under ambient...
Robust and efficient image alignment remains a challenging task, due to the massiveness of images, great illumination variations between images, partial occlusion and corruption. To address these challenges, we propose an online image alignment method via subspace learning from image gradient orientations (IGO). The proposed method integrates the subspace learning, transformed IGO reconstruction and...
In this paper, we present a multifunctional active frequency selective surface (MAFSS), which consists of two metallic layers and a substrate layer. Three electromagnetic functions of switching, polarization selection and frequency tuning, are integrated into a single board. The bias networks are embedded in each layer and comprise the MAFSS elements themselves, which eliminates the need of extra...
An improvement equivalent circuit method (ECM) for analyzing finite and curved frequency selection surface (FSS) is proposed in this paper, double-square-loop FSS has been used in the curved FSS and the transmission coefficients of both TE and TM models have been analyzed by the ECM and full wave method. It has been shown that the improvement ECM has saved computational time in designing curved FSS,...
In this paper, a multi-layer modified circular ring absorber is introduced on the basis of the ordinary circular ring. Simulations results are shown that the absorptivity is more than 90% in the frequency range from 5.5GHz to 19GHz under the normal incidence, the bandwidth is achieved up 13.5GHz, covering C, X, and Ku bands. The FSS structure exhibits the stable response for both TE and TM polarizations...
In order to determine the acceptability of dielectric coating, uncertainties estimations of reflection coefficients are studied using discontinuous Galerkin time domain (DGTD) method. According to the probability statistic theory, the mean and variance of reflection coefficients are calculated. The computed quantities of interest are compared with analytic solutions, and good agreement for the statistics...
The growth of wireless traffic and the demand for higher data rates motivated researchers around the world to enhance the Long Term Evolution-Advanced (LTE-A) performance. Recently, a considerable amount of the research had been done to optimise the packet schedulers. The packet schedulers distribute the radio resources among users to increase spectrum efficiency and network performance. In this paper,...
The intelligent logistics distribution of e-commerce is the computer technology and modern hardware equipment, software system and advanced management tools used by the logistics distribution enterprise. Data mining technology is the process of finding the probability distribution of random variables from a large number of source data. Automation of intelligent logistics system can improve labor productivity...
Step change is a key factor affecting the user trajectory and distance, to determine the trajectory of the user is a common indoor positioning method based on inertial navigation line calculation model, the prediction step is mainly based on the linear sensor, acceleration sensor data and the movement of the periodic estimation of pedestrians every step of the displacement distance. In order to improve...
Given a list of positioning measurements in location server, how to accurately estimate the user position is an open problem. We propose to apply particle swarm optimization (PSO) to estimate user position which can well explore the measurements including TDOA, TOA, DOA, and so on. Simulation results show that the PSO algorithms can significantly improve the positioning accuracy compared to current...
This paper investigates virtual inertia control for dc microgrids using voltage droop control as the power-sharing strategy. An adaptive virtual inertia control (AVIC) strategy with the variable droop coefficient is proposed to increase the inertia of the dc microgrid. By swinging the droop curve during transient events, the dc voltage change rate is reduced. The variable droop coefficient is modified...
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