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The effect of stanchion and reverse flow on turbine power performance is studied based on Computational Fluid Dynamics (CFD). The turbine in this paper is developed by National Ocean Technology Center (NOTC), the experiment study has been carried out in year 2014. The simulation model is validated based on experimental results. The CFD model can simulate the marine current conditions up to an acceptable...
Nearshore wave model was established based on the enhanced Boussinesq equations, which were dispersed into orthogonal grids on spatial distribution and solved using alternating direction implicit (ADI) algorithm. There are three kind of boundary conditions which are absorbing boundary, reflecting boundary and wave-generating boundary in the model, while the wave on open boundary was driven by the...
The existence and variability of wave energy resources of the Bohai Sea, Yellow Sea and East China Sea are studied using the 10-year (January 1st, 2003-December 31st, 2012) numerical hindcast wave data. The numerical model is a third-generation wave model developed by Key Lab of MArine Science and NUmerical Modeling, State Oceanic Administration (SOA), China and called MASNUM-WAM (Wave Model). The...
This paper presents an algebraic method for parameter identification of Thevenin's equivalent circuit models for batteries under non-zero initial conditions. In traditional methods, it was assumed that all capacitor voltages have zero initial conditions at the beginning of each test. This would require a long rest time between two successive discharging or charging tests, leading to very long test...
Collaborative filtering (CF) methods are popular for recommender systems. In this paper we focus on exploring how to use implicit and hybrid information to produce efficient recommendations. We suggest a new similarity measure and rating strategy for neighborhood models, and extend original matrix factorization (MF) models to explore implicit information more efficiently. By the mean time, We extend...
In China, the wind power is expanding very quickly. We examine a specific real wind farm in China and analyze the WRF (Weather Research and Forecasting) model forecasts with different physical configurations and spatial resolutions. The model short-term wind speed predictions for February 2008 are compared with a real data collected in a met tower in the wind farm at 10-min sampling rate. In our case...
In railway transportation area, the demand for safety of electronic devices is very high. Automatic train protection (ATP) system is a key equipment of systems for train control. Safety verification is an important issue. Conventionally, safety is ensured by testing manually with a set of test cases after system being integrated. However, testing is a very cost-intensive activity and a complete set...
Automatic train protection (ATP) system is a safety critical application for railway signaling with high logic complexity, and it is typically embedded and real-time demanded. As the computational complexity of ATP system, traditional software development method cannot accommodate effectively. In this paper, we propose a novel model-based development (MBD) scheme for ATP system. We argue that high...
Dialog-act tagging is one of the hot topics in processing human-human conversation. In this paper, we introduce a novel model to predict and tag the dialog-act, in which Markov decision process (MDP) is utilized to predict the dialog-act sequence instead of using traditional dialog-act based n-gram, and Support Vector Machine (SVM) is employed to classify the dialog-act for each utterance. The predicting...
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