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When a cloud scales out to a large size, the cloud network potentially extends to a multi-domain structure, and needs to keep its scalability, consistency and flexibility. Software-Defined Networking (SDN) provides the technical possibility to realize the requirements. However, the existing studies of SDN focus on the perspective of network builders and managers, different from the perspective of...
This paper exploits the complexities of the ship shifting and berthing operation at dockyard. Firstly establishes a shifting job problem graph model, and analyzes the solution of the model with the Bellman algebra theory. Finally it is proved that the ship shifting and berthing operation problem (SSOP) is a NPC problem and its approximate solution is also a NPC solution.
Energy absorption by a device in forms of a pendulum plate is analyzed in this paper. A 1/10 scale model of the prototype is constructed and tested under various of wave conditions in a wave flume. Moreover, capture width is studied experimentally as a prevalent physical. The results are compared with several other types of wave energy converters, and it is indicated that the performance of the device...
Applying the original experimental data of series 60 ship models, four-layer back propagation neural network is founded. Test samples and interpolated samples are randomly selected as input vectors. The worse of the maximum relative error, the average relative error and the correlation coefficient between the outputs and the goals, their regression lines and the performance curves plotted by the neural...
A novel solution for two dimension irregular parts nesting with immune genetic algorithm (IGA) was presented, which overcome the shortages of premature constringency and low efficiency existing in genetic algorithms (GA). IGA introduced immune memory and concentration mechanism to improve searching speed and the ability of keeping the diversity of population. The method combined with remaining rectangle...
A shipborne helicopter platform, which can compensate wave motion, is useful for a helicopter to land and take off safely. In order to solve the time delay problem of hydraulic cylinder, the prediction for the generalized heave motion (the coupling result of roll, pitch and heave) of the platform is needed. An Automation Regressive (AR) model is proposed to do the short time prediction for its low...
An improved Ant Colony System (ACS) algorithm is proposed for two dimension irregular parts nesting problem. Based on the state transition rule, local and global updating rule of ACS, this paper introduce local search with genetic operation and immune selection to improve searching ability and to keep the diversity of antpsilas tours, which can converge at the global optimum easily. The method combined...
A shipborne helicopter platform, which is connected with a ship by hydraulic cylinders, is helpful for a helicopter to land and take off safely. The large inertia of the system arouses the problem of time delay when the system running. In order to solve that, the short time prediction for the generalized heave motion (the coupling result of roll, pitch and heave) of the platform is needed. In this...
A back propagation algorithm is a supervised learning algorithm applied to train a neural network off line. This paper introduces a modified learning algorithm. The training algorithm, which is composed of a temporal difference (TD) method and a dynamic BP algorithm (DBP), can train an Elman network online. A gradient descent momentum and adaptive learning rate algorithm is applied to the TD-DBP algorithm...
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