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This paper presents a new control law for three-dimensional path following of underactuated autonomous underwater vehicles (AUV). The kinematic controller based on the Serret-Frenet frame is firstly designed, which is convenient to describe the track errors. It also overcomes the stringent initial condition constraints by introducing virtual target. Moreover, the dynamic controller based on Lyapunov...
We establish a one-to-one mapping between the local phase slip and the spatial position near the focus by scanning a thin jet along the propagation direction of laser beams. The measurement shows that the optimal phase of THz can be utilized to characterize in situ the spatially dependent relative phase of the two-color field and the carrier-envelope-phase of the few-cycle pulse. The result is of...
Phaselock technique is used to improve the resolution of the phase delay for THz generation in two-color laser field, which leads a high resolution up to several microradians. The results show that the optimal phase delay shifts slightly with the experimental conditions changing.
Reliability is one of the key concerns of both cloud providers and consumers, who require accurate reliability evaluation methods to develop, deploy, and maintain cloud applications. However, few works assess the reliability of cloud applications considering deep dependencies in the deployment stack. To explore the impact of deep dependencies to the reliability assessment, in this paper, we propose...
In order to estimate the state of health (SOH) of single cell in the electric vehicle power battery pack, this paper researched on t he properties of battery's polarization resistance and ohmic resistance, and then a relative state of health evaluation method which is based on the ohmic resistance was proposed. This method can avoid absolute interference on the battery performance from external such...
Mechanically flexible photonic-crystal cavities consisting of disconnected Si-column arrays are fabricated on Ge nanomembranes by a novel membrane assembly approach. Photonic-crystal cavity resonances are clearly observed in the strain-enhanced photoluminescence spectra.
We demonstrate experimentally that terahertz generation from ionizing gas in the two-color fields with co-rotating circular polarization is five times stronger than that with usually linear polarization.
Infrared and visible image fusion can integrate the target information of an infrared image and the spatial detail of a visible image to constitute a fused image, which has more complete and accurate description of the same scene than a single image. In this paper, a novel image fusion method using saliency detection based on non-subsampled shearlet transform (NSST) is proposed for infrared and visible...
In this paper, we present a natural interface between a drone, i.e., a miniature aerial vehicle (MAV), and a human, in which a stereo-vision-MAV is flied via a HMD (Head Mounted Display) with inertial sensors. A stereo camera is mounted on a MAV and the stereo images are transmitted to a remote PC. Then, a user controls the motion of the MAV by his/her head pose, which is measured from the inertial...
We present in situ measurements of the relative phase shift induced by Gouy phase shift near the focus in two-color field. The good agreement between the measurement and the theoretical prediction shows that the optimal phase of THz is robust enough as an useful tool to measure the relative phase change.
We experimentally demonstrated that the circularly polarized two-color femtosecond pulses with the same helicity can effectively enhance terahertz intensity by a factor of 5 in comparison with the linearly polarized counterparts. The quantum mechanical simulations confirm this enhancement based on the analysis of residual current calculated by time-dependent Schrödinger equation in three dimensions...
Synchronizing high-harmonics and terahertz-wave spectroscopy (HATS) has been demonstrated as an efficient approach in revealing the information of molecular structure and the underlying electron dynamics. We further investigate the alignment dependent HATS from carbon dioxide at different dual-color relative phases (DRP). We find that the alignment dependence of terahertz generation dose not vary...
This contribution investigates the influencing factors on the directivity estimates for an electrically large equipment under test (EUT). A rectangular slotted metallic enclosure with a connecting wire was considered as an EUT. The maximum directivity Dmax was simulated by a numerical simulation technique in the frequency range from 1 GHz to 6 GHz. The simulation results show that approximately 6...
This paper proposes a fault line detection method based on cross correlation coefficient for distribution network which has distributed generation (DG). Firstly, Genetic Algorithm (GA) is used to optimize the potential function parameters of bistable system (BS), and bistable system is utilized to extract zero-sequence current in noise background. Then, as for fault line detection criterion, the cross...
This paper proposes a fault line detection method based on cross correlation coefficient for distribution network which has distributed generation (DG). Firstly, Genetic Algorithm (GA) is used to optimize the potential function parameters of bistable system (BS), and bistable system is utilized to extract zero-sequence current in noise background. Then, as for fault line detection criterion, the cross...
The qualification rate of power system state estimation has become an important assessment indicator of power grid operation in regional power grid. In this paper, combined with the operation of the state estimation software in Hebei power grid, the influence factors of the state estimation's qualification rate is analyzed. The improvement measures to improve state estimation's qualification rate...
The requirements for most software systems — the intended states-of-affairs these systems are supposed to bring about — concern their operational environment, often a socio-physical world. But software systems usually don't have any direct means to change that environment in order to bring about the intended states-of-affairs. In what sense then can we say that such systems fulfill their requirements?...
In this paper, we propose a fault line detection method based on optimized cascaded bistable system (OCBS) for distribution network. Firstly, we use Genetic Algorithm (GA) to optimize the potential function parameters of bistable system (BS), and use OCBS to extract transient zero-sequence current (TZSC) in noise background. Then, as for fault line detection criterion, we define the square distance...
This paper investigates the station (STA)-access point (AP) association and airtime control for virtualized 802.11 networks to provide service customization and fairness across multiple Internet service-providers (ISPs) sharing the common physical infrastructure and network capacity. More specifically, an optimization problem is formulated on the STAs' transmission probabilities to maximize the overall...
Research has indicated that microRNAs (miRNAs), a special class of non-coding RNAs (ncRNAs), can perform important roles in different biological and pathological processes. miRNAs' functions are realized by regulating their respective target genes (targets). It is thus critical to identify and analyze miRNA-target interactions for a better understanding and delineation of miRNAs' functions. However,...
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