Distributed Denial of Service (DDoS) attacks are one the biggest concerns for security professionals. Traditional middle-box based DDoS attack defense is lack network-wide monitoring flexibility. With development software-defined networking (SDN), it becomes prevalent to exploit centralized controllers defend against attacks. However, current solutions suffer with serious southbound communication overhead and detection delay. In this paper, we propose a cross-plane framework in SDN, called...

Distributed Denial of Service (DDoS) attacks are one the biggest concerns for security professionals. Traditional DDoS attack detection mechanisms based on middle-box devices or SDN controllers, which either lack network-wide monitoring information suffer with serious southbound communication overhead and delay. In this paper, we propose a SDN-based framework cross-plane collaboration called OverWatch, performs two-stage granularity filtering procedure between coarse-grained data plane fine-...

This paper presents a fully integrated passive UHF RFID tag chip complying with the ISO18000-6B protocol. The includes an RF/analog front-end, baseband processor, and 512-bit EEPROM memory. To improve power conversion efficiency, Schottky barrier diode based rectifier is adopted. A novel voltage reference using peaking current source discussed in detail, which can meet low-power, low-voltage requirement while retaining circuit simplicity. Most of analog blocks are designed to work under...

The software design is one of the most challenging tasks during a mechatronic system. On hand, it has to provide solutions deal with concurrency and timeliness issues other glue different disciplines (such as software, control mechanical) system whole. In this paper, we propose model-driven approach part system, which consists two major parts: systematic modeling correctness-preserving synthesis. stage divided into four steps, focus on aspects concurrency, multiple timeliness) respectively....

The bacterial foraging optimization algorithm (BFOA) is an intelligent population widely used in collision avoidance problems; however, the BFOA inappropriate for ship planning with high safety requirements because converges slowly, optimizes inaccurately, and has low stability. To fix above shortcomings of BFOA, autonomous based on improved (IBFOA) demonstrated this paper. An adaptive diminishing fractal dimension chemotactic step length designed to replace fixed achieve adjustment, optimal...

This study proposes a novel approach to solve the source localisation problem with noisy range measurements. Since objective function of range‐based least square is non‐convex and non‐smooth, it challenging achieve an accurate estimation. Unlike previous methods that took non‐convexity property into account, this addresses considering non‐smoothness function. The solved by two‐stage local optimisation technique which based on smooth approximation original First, method utilised obtain coarse...

For the shortages of existing vehicle positioning technologies, a method combining radio frequency identification (RFID) technology with extended kalman filter (EKF) algorithm to realize in urban complex environments is proposed. The preliminary noise-contained position information based on RFID fused steering wheel angle and speed then EKF used eliminate noise for achieving accurate, real-time, reliable information. Simulated results show that can locate well able effectively reducing...

Abstract In view of the insufficient flexibility and adjustment capabilities caused by high proportion renewable energy connected to distribution network limitations source‐side method, a load‐side resource cluster partitioning method based on zonotope approximation is proposed cope with requirements brought uncertain resources. First, constraint space resources such as storage, multi‐source mobile electric vehicles, temperature‐controlled loads described convex polyhedral form general model...

Abstract RamRig hosting system is a common for offshore and onshore drilling rigs, which uses ram cylinders to lift lower the top drive on rig. In order ensure accuracy, stability robustness of synchronous control system, RBF neural network used adjust PID parameters online, three loop simulation model based optimized controller built in AMESim Simulink. The results show that hydraulic circuit has higher accuracy stability, fully capable realizing output action system.

This paper discusses the hydrodynamic optimization of hull form mainly. The study has been carried out using an integrated tool for optimization, incorporating a CAD modeler definition and parametric modification forms, CFD codes evaluation performance software decision making. A includes geometric modeling, analysis, design shape variation DTMB5415. Genetic Algorithm is utilized to explore space improve shape. most relevant feature its capability carry automatically evaluate modifications...

Abstract As a new generation of OPC protocol, UA provides standardized interoperability solution for industrial automation. In order to accelerate the application in control networks, Foundation published PubSub protocol. With gradual opening network, security risks deep manufacturing facilities are greatly increased, so it is urgent study protection Based on we characteristics its deployment environment and threats faces, point out defects solutions protocol's own mechanism. At same time,...

On the basis of introducing parent ships design method in vessel design, Explaining database architecture that developed for and similarly, technique operation flow using development process. meantime, particular excogitation is fulfilled to system function, composition, so on. The enhances effectiveness data improves speediness new design.

Abstract Under the background of industrial intelligence, OPC UA PubSub mode is strongly supported by Industry 4.0 as a protocol designed to meet communication requirements control level. With gradual opening network, security model in alone cannot new under OT and IT integration. According specification, we analyze possible threats, impacts countermeasures that may face deployment environment, emphasized difficult protect resource-constrained field equipment from harm caused DoS other...

In order to quickly and accurately recognize classify the fault modes of hydraulic end fracturing pump according real-time test data pump, this paper proposes a k-medoids clustering algorithm based on feature reduction. First, FRMB is used reduce features set, remove redundant from calculate correlation evaluation each subset, assign weight value corresponding subset importance. Finally, realize identify mode pump. The experimental results show that compared with classical algorithm,...