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A fast fault location and isolation scheme for active distribution network with effectively earthed neutral is proposed in this paper. Firstly, the generalized current phase-angle difference (GCPAD) of a zone is defined, and its fault feature is analyzed. Secondly, the fault zone determination method based on the GCPAD is proposed. Thirdly, on the basis of the proposed fault zone determination method,...
In order to obtain accurate single-phase-to-ground zero-sequence current signal to improve the accuracy of fault line selection, a new data acquisition method—compressed sensing theory, was applied to single-phase-to- ground fault line selection of distribution network. A new method of fault line selection based on Bayesian compressed sensing theory was proposed. The method used compressed sampling...
This paper studies the system of Electric-field Coupled Power Transfer (ECPT) based on the E-class amplifier topology. An CLC-S-compensated circuit topology is applied at the primary side to resonate with the power transmitting plates. The voltage gain model is presented with the help of the impedance transformation principle. There are three system parameters (the load quality factor Q, the normalized...
This paper presents the speed tracking control of unicycle type mobile robot in the presence of environmental disturbances and model uncertainties. In order to solve tracking issues, a Linear Active Disturbance Rejection Control (LADRC) based control is proposed here. the forces and voltages of the motors acting on the two wheels are considered in the dynamic model of the robot. The proposed control...
In this work, we present an algebraic solution to the classical perspective-3-point (P3P) problem for determining the position and attitude of a camera from observations of three known reference points. In contrast to previous approaches, we first directly determine the cameras attitude by employing the corresponding geometric constraints to formulate a system of trigonometric equations. This is then...
The two-ray model has been used for modelling of wireless channels already for decades. However, since researchers and industry are pushing forward to unlock the millimeter wave bands, we revisited this model. We re-derive the break point distance based on a generalized first Fresnel zone. The simplified approximation formula — four times the product of antenna heights scaled by wavelength — is especially...
In the area of belief revision, several different constructive models were discussed in the literature, such as epistemic entrenchment, system of spheres, faithful total preorder and so on. All these models could be used to characterise AGM revision operators. However, the relationship among these models was absent. This paper mainly concerns whether these models are equivalent, and whether we can...
Learning from examples, either alone or combined with problem solving has been proven to be beneficial for learning in Intelligent Tutoring System. However, it is generally unknown how much example-based assistance should be provided. We previously found that erroneous examples prepared students better for problem solving in comparison to worked examples when the order of learning activities is fixed...
Learning the dynamics of shape is at the heart of many computer vision problems: object tracking, change detection, longitudinal shape analysis, trajectory classification, etc. In this work we address the problem of statistical inference of diffusion processes of shapes. We formulate a general Itô diffusion on the manifold of deformable landmarks and propose several drift models for the evolution...
Based on the LEACH protocol and the Single-hop protocol, this paper proposes a new method to predict the lifetime and reliability of wireless sensor network directly. That is to say, the sensor nodes can be directly deployed without further simulation. Through a series of experiments to compare the two protocols have been several key conclusions: With the increase in sensor density, although the LEACH...
The stream cipher Espresso was proposed by Elena Dubrova and Martin Hell in Cryptography and Communications in 2015, which employs the nonlinear feedback shift register (NLFSR) of Galois configuration as a main building block. This Galois configuration of NLFSR is transformed into its equivalent Fibonacci configuration, and then stream cipher Espresso is changed into the stream cipher Espresso variant...
Coded caching has gained a lot of interest recently. It jointly optimizes placement and delivery phases to create network-coded multicast opportunities to attain performance that surpasses conventional uncoded caching schemes. To the best of our knowledge, all coded caching systems studied in the literature are based on content popularity distributions as seen from the server's point of view. In this...
We study knowledge sharing among engineers to develop a nuanced understanding of the role of meaningful work and organizational identification by integrating the knowledge management framework, the job characteristics model and organizational identity theory. Using a cross-sectional survey of 168 engineers with managerial responsibilities from several industries in Colombia, we tested a structural...
Storing and retrieving problem for assembly blocks in a ship block stockyard is an important operational problem in shipyards. It affects not only the operation efficiency of stockyard but also the productivity and coordination of workshops. This paper formulates a mathematical model with the purpose of reducing unproductive moves in a stockyard. A heuristic approach is proposed combining a relocating...
With the development of web service technology, identifying and discovering the users with similar preferences have an important significance to service selection and service optimization in the service environment. In order to divide the users into groups based on their preference similarity in the process of service selection, a combination-based clustering algorithm, named AAK, is presented in...
This paper presents a three-dimensional model for maneuvering of a spacecraft with unactuated fuel slosh dynamics, and uses Lagrangian for multi-pendulum analogy to obtain a mathematical model. Using of multi-pendulum model could be the best way for characterize the most fluid sloshing modes. Also, whole the fuel in the container is modeled by a fixed mass and two sloshing masses.
We formulate a mathematical programming problem for allocating capital budget between the organizational and physical capitals of the firm and solve it to obtain an analytically tractable and easy to implement decision rule for the optimal allocation of the capital budget. The model we develop depicts interconnections of these capitals and their constituent variables in the context of the firm's valuation...
We present a structured scenario method for the development of transparent, plausible and consistent scenarios. By a case study on the development of European energy scenarios, the process of the Cross-Impact-Balance approach will be explained and challenges and advantages will be derived.
In this paper, we propose an image transformation method for correcting projective distortion which commonly occurs in surveillance camera systems. The method geometrically transforms a planar image into an equirectangular image using a spherical image sensor model. The transformation makes objects standing perpendicular to the ground to appear vertically in the image and also makes objects at the...
Organizations ranging from the Internet, to economies, to large global corporations, to rapidly changing technological ecosystems can be thought of as Complex Adaptive Systems (CAS). When viewed from the bottom-up CAS is often characterized by distributed control, connectivity, co-evolution, emergence, and unpredictability. When viewed from the top-down characteristics such as an implicit order, qualified...
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