WHOIS is a long-established protocol for querying information about the 280M+ registered domain names on Internet. Unfortunately, while such records are accessible in ``human-readable'' format, they do not follow any consistent schema and thus challenging to analyze at scale. Existing approaches, which rely manual crafting of parsing rules per-registrar templates, inherently limited coverage fragile ongoing changes data representations. In this paper, we develop statistical model that learns...

To decrease the complexity and increase efficiency of wireless power transfer (WPT) systems, this paper proposes a novel self-excited invert rectification method for design rectifier receiver (Rx). The can perform self-driving soft-switching MOSFETs as well frequency-tracking function without microcontroller. This allows us to greatly simplify structure (TE) WPT system. Firstly, circuit is designed, studied. Additionally, loss analyzed. Finally, experimental system designed. then verified....

In recent years, wireless power transfer (WPT) technology has entered the application stage. However, inevitable presence of foreign objects (FO) in magnetic coupling area during operation WPT systems, especially ferrite FO, may result system detuning and safety incidents. To address this issue, paper studies mechanism by which FO affects providing a foundation for future development an detection device. Using series–series topology as example, loop model incorporating is first developed to...

Abstract This paper addresses the constrained H∞ optimal control problem for nonlinear active vehicle suspension systems, with a focus on deriving an approximate solution through data-driven reinforcement learning in context of differential games. A dynamic model half-car system constraints is first established, where forces and external road disturbances are formulated as zero-sum game between two players. leads to Hamilton-Jacobi-Isaacs (HJI) equation, Nash equilibrium desired solution. To...

We study the problem of detecting latent geometric structure in random graphs. To this end, we consider soft high-dimensional graph G(n,p,d,q), where each n vertices corresponds to an independent point distributed uniformly on sphere Sd−1, and probability that two are connected by edge is a decreasing function Euclidean distance between points. The connection parametrized q∈[0,1], with smaller q corresponding weaker dependence geometry; can also be interpreted as level noise graph. In...

A shared parking space optimization (SPSO) model is established to alleviate China's problem considering travelers' tiered credit risk. The SPSO has the following characteristics: possibilities for default are measured by value; travelers with different tiers classified and managed; success of will be affected traveler's value. In order solve model, we transform it into a vertex coloring an undirected graph then modify ant colony algorithm (ACA) improving in two aspects pheromone...

Electromagnetic actuators, characterized by their lack of pneumatic or hydraulic circuits, rapid response, and ease control, have the potential to significantly enhance dynamic performance automotive active suspensions. However, complexity associated with models calibration control parameters hampers efficiency design. To address this issue, paper proposes a reinforcement learning vibration strategy for electromagnetic suspension. Firstly, half-car model suspension is established....

We study random graphs with latent geometric structure, where the probability of each edge depends on underlying positions corresponding to two endpoints. consider setting this conditional is a general monotone increasing function inner product vectors; such can naturally be viewed as cumulative distribution some independent variable. A one-parameter family graphs, characterized by variance variable, that smoothly interpolates between dot graph and an Erdős–Rényi graph, investigated....

In wireless power transfers (WPTs), it is challenging to obtain a constant output of (COP) and transmission efficiency (CTE) in large coupling variation ranges. this study, the eight-coil WPT system achieves uniform magnetic field (UMF) transmitter receiver sides using two transmitting (Tx) coils receiving (Rx) coils, respectively. COP CTE are then achieved with The circuit model equations characteristics first obtained based on structure working principle Helmholtz coil. mutual inductance...

Wireless power transfer (WPT) via coupled magnetic resonances has been in development for over a decade. However, the frequency splitting phenomenon occurs over-coupled region. Thus, output of two-coil system achieves maximum at two angular frequencies, and not natural resonant frequency. According to theorem, impedance compensation method was adopted many WPT projects. it remains challenge achieve transmission efficiency fixed-frequency mode. In this study, dynamic presented by utilizing...

Abstract An active suspension system ensures the controllability of a vehicle in vertical direction, which greatly enhances control redundancy and safety an intelligent driven vehicle. However, many calibrated model parameters are not conducive to application optimal control. To reduce cost suspension, model-free H∞ output feedback method is studied this research. First, governing equation transformed into zero-sum game problem two players, off-policy reinforcement learning algorithm...

Wireless power transfer (WPT) via coupled magnetic resonances has become a focus recently, but the mechanisms responsible for such work are uncertain. We found that WPT system is self-organization by utilizing theory to judge. Firstly, circuit model was established and characteristic of researched theories. Thus, with introduction entropy variable S, energy equation state can be from transmitter side receiver side. According state, this paper obtains two equations when reactance equate zero...

Purpose The purpose of this paper is to study the wireless power transfer (WPT) system that always achieves maximum output at a fixed angular frequency using dynamic impedance compensation and also efficiency. Design/methodology/approach An efficient topology WPT proposed which states functions relay are transformed into compensator in three-coil system. Findings Increasing ratio detuning factor relative causes curves normalized efficiency move toward high direction. Practical implications...

This paper investigates the experimental study of differential steering control a four-wheel independently driven (FWID) electric vehicle (EV) based on steer-by-wire (SBW) system. As each wheel FWID can be driven, is realized by applying different torques to front-two wheels. Firstly, principle analyzed SBW When activated, driver’s request sent vehicle’s ECU. Then, ECU gives signals front-left and front-right wheels, generating an external force components. The pushes components turn...

We characterize the performance of graph neural networks for alignment problems in presence vertex feature information. More specifically, given two graphs that are independent perturbations a single random geometric with noisy sparse features, task is to recover an unknown one-to-one mapping between vertices graphs. show under certain conditions on sparsity and noise level vectors, carefully designed one-layer network can high probability correct help structure. also prove our tight up...

The research motivation comes from the fact that vigorously promoted 'coal to gas'policy under pressure of China's Ministry Environmental Protection(MEP) has led severe gas shortage in many regions. This study explores a cross-regional energy coordination scheme, which MEP sets pollution transfer prices and standards for each region, while region determines its inputs pollutant removal amounts. It is first formulated as bilevel programming called PTEC then it transformed corresponding...

This paper investigates a parameter-free H∞ differential game approach for nonlinear active vehicle suspensions. The study accounts the geometric nonlinearity of half-car suspension and cubic damping elements. control problem is reformulated as zero-sum between two players, leading to establishment Hamilton–Jacobi–Isaacs (HJI) equation with Nash equilibrium solution. To minimize reliance on model parameters during solution process, an actor–critic framework employing neural networks utilized...