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Since it was first proposed, the new method of power demand forecasting using a stochastic model has been greatly talked about in the scientific community and increasing number of practical applications are being developed, since it is a simple and effective approach to forecast power demand within a small time interval. However, the relevant literature still assumes that all statistic parameters...
Failures are not uncommon in production data center networks (DCNs) nowadays, and it takes long time for the network to recover from a failure and find new forwarding paths, significantly impacting real time and interactive applications at the upper layer. The slow failure recovery is due to two primary reasons. First, there lacks immediate backup paths for downward links in DCN with multi-rooted...
Accurate and reliable information on land use is a basis of agricultural disaster warning and emergency action. The natural disasters typhoon, cold disaster, drought, and so on, have great influences on agricultural production in Guangdong Province, China. Through literature analysis at home and abroad, it was pointed out that Chinese HJ satellites have become important sources of remote sensing images...
This paper presents a new vertical axis propeller, which combines the turbine with the rudder and can generate thrust in all directions. It describes the modelling of the vertical axis propeller and presents the results of simulations under various conditions. The two-dimensional (2D) simulations investigate the influence of parameters such as advance coefficient, blade number and spacing distance...
Tidal current power generation system extracts energy by transferring the kinetic energy of tidal movement to the motion of power turbines. The long coastline of China contains abundant tidal energy, but not all coastal area worth exploiting. It is generally considered that a mean spring peak tidal current of at least 2 m/s is required for tidal current power exploitation. Thus we choose to evaluate...
In the data flow models of today's data center applications such as MapReduce, Spark and Dryad, multiple flows can comprise a coflow group semantically. Only completing all flows in a coflow is meaningful to an application. To optimize application performance, routing and scheduling must be jointly considered at the level of a coflow rather than individual flows. However, prior solutions have significant...
Network is dynamic and requires update in the operation. However, many confusions and problems can be caused by careless schedule in the update process. Although the problem is noticed for long in traditional networks, software defined networking (SDN) brings new opportunities and solutions to this problem by the separation of control and data plane, as well as the centralized control. This paper...
It has been understood the large drawback of a CLLC bidirectional serious resonant converter is using three magnetic components, i.e., the transformer and two resonant inductors. In this paper, an integrated magnetic transformer for simplifying and boosting the electrical vehicle (EV) and plug-in electrical vehicle (PHEV) on board charger module (OBCM) implementation and performance of a bidirectional...
Bearing failure is one of the important gearbox failure modes of wind turbines, which is also the main issue to affect the wind turbine reliability. This paper studies thermal mechanism of a rolling bearing installed at a wind turbine gearbox high speed end, based on which a thermal network model is embedded into the wind turbine simulation. Dynamic thermal characteristic of this rolling bearing is...
Accurate wind turbine fault diagnosis is a challenge problem currently due to the complexity of a wind turbine system. A wind turbine is not only influenced by random wind speed but also variable control strategy which is designed to extract maximum energy production by assuming the wind turbine is operating healthily. But once a failure occurred in a wind turbine, its performance will deviate from...
The interpolation method and the choice of basis functions is a key problem of visualization technology. This paper presents a parallel RBF interpolation algorithm based on hyperbolic Multiquadric function. The algorithm of parallel processing of interpolation data using computer automatic selection of interpolation points and interpolation point and computer multi nuclear characteristics, the strengthening...
Tracking trajectory of three-dimensional trees is a difficult problem in computer animation and virtual reality. It requires not only high sense of reality for the morphology of trees and tree moving, but also adequate real-time. In this paper, we present a simulation method based on video data driven. Firstly, split out the main branches and leaves of trees from video images by using hybrid method...
Near ship water field, computing Green's Function with large parameter is discussed, the differential equation and boundary condition are considered by using Dirac delta function, and analyzing solution is represented as integration. The convergence series is obtain for large parameter, and parallel computing results show that convergence speed is high.
The change of ship's characteristic length can change scientific researching method. The paper gains the calculation parameters of Green function and the relational expression of vessels' characteristic length by establishing the analysis theory of ships' characteristic length dimension based on the control equation of green function and gives the statistical expression for ships' characteristic length...
This paper considers the problem of selecting nodes in distributed compressed sensing, which is one of the best ways to make the measurement matrix. We propose a novel method based on Random Access Compressed Sensing (RACS) denoted by Unequal Probabilities Random Access Compressed Sensing (UPRACS). In the proposed scheme, nodes do not use the same probability when they decide whether to participate...
This paper present a study of the isolated DC/DC stage of Bi-directional on-board battery charger module (OBCM) for electric vehicle (EV) and plug-in hybrid electric vehicle (PHEV) application. The modulated dual active bridge (DAB) converter and boost series resonant converter were thoroughly analyzed for this application. The ZVS boundary conditions, power stage optimization compatible to wide output...
Network performance aware optimizations have long been an effective approach to optimizing distributed applications on traditional network environments. However, the assumptions of network topology or direct use of several measurements of pair-wise network performance for optimizations are no longer valid on IaaS clouds. Virtualization hides network topology from users, and direct use of network performance...
This study explored the effect of situational factors on pedestrian intention to jaywalk. In particular, eight scenarios were designed to manipulate three situational factors, namely, time pressure, descriptive norm, and official supervision. A total of 124 subjects participated in the study. Repeated-measures ANOVA analyses indicated that hypothetical high time pressure, negative (unsafe) descriptive...
In this paper, we consider the energy-efficient power allocation in the downlink of a large-scale multiple-input multiple-output (MIMO) system under both quality of service (QoS) constraints and maximum transmit power constraints. With these two constraints satisfied, the resource allocation strategies are proposed, which aim to maximize the energy-efficiency defined as the successfully delivered...
The network resource competition of today' data enters is extremely intense between long-lived elephant flows and latency-sensitive mice flows. Achieving both goals of high throughput and low latency respectively for the two types of flows requires compromise, which recent research has not successfully solved mainly due to the transfer of elephant and mice flows on shared links without any differentiation...
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