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This article analyzes the definition and connotation of the e-commerce industry cluster, and then discuss the chaotic characteristics of the cluster from the perspective of chaos theory. Base on the qualitative results, the article discusses the five — level symbiotic relationship of e — commerce industry cluster by using Logistic expansion model, which are competition symbiosis, biased symbiosis,...
This paper is aimed to investigate the performance of synchronous traction system in EMU train under coordinated control method. It is composed by several permanent magnet synchronous motors (PMSMs). Since the parameters of PMSMs are greatly influenced by the magnetic field, the co-simulation model is built, which combines the control strategy and finite element model (FEM) of PMSMs. Based on this...
With the emergence of a large number of 3D models, retrieving 3D models is becoming more and more important. It is well known that 3D shape features suffer from sparse sampling and view-based features have the ambiguity of different views for a 3D model. In this paper we present a method which combines 3D shape features with view-based features of 3D model to retrieve models. Moreover, according to...
Industry 4.0 requires validated simulations for rapid customisation and through-life designs. Wind tunnel experiments have been widely used in validating flow-field simulations for aircraft design and manufacture. In this paper, we perform the experiments for simulating the NACA0015 model wings in various shapes and angles of attacks (AoA) through an anatomy wind tunnel. Particle traces are recorded...
In practical applications, multi-objective optimisation is one of the most challenging problems that engineers face. For this, Pareto-optimality is the most widely adopted concept, which is a set of optimal trade-offs between conflicting objectives without committing to a recommendation for decision-making. In this paper, a fast approach to Pareto-optimal solution recommendation is developed. It recommends...
A digital signal processor (DSP)-based direct recurrent wavelet neural network (RWNN) controller is proposed to control the rotor position of a thrust active magnetic bearing (TAMB) system learned through adaptive differential evolution (ADE). First, the dynamic analysis of the TAMB with differential driving mode (DDM) is derived. Subsequently, due to the exact dynamic model of TAMB system is absent;...
In this study, we developed a driver-assistance system on Lane Detection during nighttime by mounting a CCD camera inside the car to capture images and to use computer visions to detect lanes and the driving condition in front of the vehicle. This system can increase the safety of driving during low light condition. The features of this system includes: lane detection, surrounding vehicles detection,...
An optimal time model for the path planning is proposed in this paper. In this model, the trajectory planning based on an optimal time which limited by the maximal velocity and acceleration. Considering the optimal time planning in the acceleration level, the velocity planning is divided into three segments, namely, acceleration segment, constant segment, and deceleration segment. Besides, we construct...
In this study, a video enhancement method based on high dynamic range processing was proposed. This method can enhance images that have backlighting problems and are underexposed or overexposed to improve visibility. The proposed method comprises pre-processing, illumination judgment, tone mapping, and color restoration. Initially, a small segment of an image is used to calculate an average luminance...
In this paper feedforward controller is designed to eliminate nonlinear hysteresis behaviors of a piezoelectric stack actuator (PSA) driven system. The control design is based on inverse Prandtl-Ishlinskii (P-I) hysteresis model identified using particle swarm optimization (PSO) technique. Based on the identified P-I model, both the inverse P-I hysteresis model and feedforward controller can be determined...
In this paper feedforward controller is designed to eliminate nonlinear hysteresis behaviors of a piezoelectric stack actuator (PSA) driven system. The control design is based on inverse Prandtl-Ishlinskii (P-I) hysteresis model identified using particle swarm optimization (PSO) technique. Based on the identified P-I model, both the inverse P-I hysteresis model and feedforward controller can be determined...
With the economic development and people's living standards improve; natural gas has become an important source of urban life and industrial energy. However, influenced by the factors of failure, failure of natural gas pipelines leakage accidents have occurred, causing serious casualties and property losses. Therefore, the risk assessment, maintenance and management of natural gas pipeline, ensure...
In the process of sport learning, learners spend a lot of time on practicing in order to develop correct action habit. Take golf practice as an example. Without the supervising of coaches, novices may keep practicing wrong swing actions, and that will cost more time later on to correct the wrong habit. It would be helpful to let learners can be aware of incorrect swing actions in self-training. In...
With a large number of distributed generations' access, the impact of distributed generations to the grids ' security and stability can not be ignored. The microgrid is a good solution to the access. This paper builds the asynchronous wind turbine and the microgrid model based on Matlab/Simulink simulation platform.The port characteristics of the asynchronous wind turbine is given. Finally, a storage...
The bathtub-shaped curve is essential in interpreting the failure rate function for the reliability analysis, and its parameters determine the representation of the bathtub-shaped function. This paper introduces a parameterised bathtub curve that provides an adaptive bathtub-shaped failure rate function (ABF) modelling approach which can be also easily utilised as a universal objective for further...
To process an image is to treat the images properly, such as in the applications of image noise reduction. The goal of noise reduction is to reduce the damage to the image detail and blur. Many researches are to determine the content of images from pixels. Some researches focus on reducing the noise by the image classification and estimation. The thresholds of these classification algorithms are always...
This study employs Regression analysis to establish the implicit importance of quality attributes and the overall satisfaction, and adopt the fuzzy DEMATEL, which consider the fuzziness of human thinking, to calculate the causal relationship and the influential degree among each quality attribute, and then proposes a new methodology of decision analysis, which modifies the traditional IPA model and...
Due to the characteristics of high reliability, wide speed scope with high efficiency, and low cost, Switched Reluctance Generator (SRG) system is suitable for applications in the field of variable-speed constant-voltage generation, such as wind power generation, flywheel energy storage, electric vehicle, aircraft power generator, etc. In this paper, a nonlinear dynamic model of SRG system is established,...
The finite-difference time-domain (FDTD) method is used to calculate the specific extinction cross-section (SECS) of the carbon-fiber powder at 35 GHz. The digitized models with a random process using the turning bands method are simulated for the carbon-fiber powder. The digitized models of the carbon-fiber power having 12500 to 5832000 cubical particles with sell sizes in the range of 7 to 100 µm...
Glaucoma is a serious ocular disease and leads blindness if it couldn¡¦t be detected and treated in proper way. The diagnostic criteria for glaucoma include intraocular pressure measurement, optic nerve head evaluation, retinal nerve fiber layer and visual field defect. The observation of optic nerve head, cup to disc ratio and neural rim configuration are important for early detecting glaucoma in...
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