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In this paper, a novel packet-layer quality assessment system is proposed to monitor the quality of Voice over Internet Protocol services. The efficient machine learning algorithm of random forest is utilized to give the importance of the assessment parameters. The significant parameters are selected to get rid of the disturbance caused by the insignificant ones. To solve the challenge that the usual...
A Hybrid RANS/LES 3D unsteady numerical simulation of aerodynamic noise of NREL PHASE VI wind turbine at the wind speed of 7 m/s was performed with commercial CFD software ANSYS FLUENT, in which LES turbulence model was applied to analyze the aerodynamic noise of the wind turbine combining with FW/H model. But numerical simulation of aerodynamic noise performed with the similar method of the NACA0018...
For the characters of the City of Kunming' trunk road, this paper proposed a model of one-way green wave coordination control based on fuzzy neural network, from the optimization of the cycle, offset and split of intersections. At last the simulation shows the proposed method can reduce the queue length and vehicle delay very well.
Paper introduces the type of reversible lanes technology briefly and discusses the fundamentals of reversible lanes technology in two aspects: road conditions and traffic flow characteristics. Based on the internal relationship between reversible lanes and traffic control, also puts forward the framework for reversible lanes and intersection signal control linkage control optimization, mainly researches...
Regional development and environmental change has been one of the most frequently discussed issues among various intergovernmental conferences since cities have proved to be the biggest carbon source of the world Greenhouse Gases. Based on meteorological observation data and socio-economic statistical data from 1978 to 2000, this paper gained the spatial-temporal distribution features of urban climate...
Time and price are very important factors for demand. Through proposing a sensitive coefficient (named as rho) of market price dependent on wholesale price, this research establishes a random Newsboy model with demand dependent on price and time, and analyzes the relationship among retail price, ordering time and ordering quantities. From theory induction and numerical verification, it proves that...
Prefetching is an effective technique for improving file access performance, which can significantly reduce access latency for I/O systems. In distributed storage systems, prefetching for metadata files is critical for the overall system performance. In this paper, an affinity-based metadata prefetching (AMP) scheme is proposed for metadata servers in large-scale distributed storage systems to provide...
Simulating the blood flow in human arterial system is an important task as it can help us to better understand the human arterial system and hence, cure and/or prevent heart and arterial diseases. From a physical point of view, the blood flow can be considered as a fluid dynamics problem (blood flow) coupled with a structural deflection problem (deflection of the blood vessel). This paper first presents...
Simulating the blood flow in human arterial system is an important task as it can help us to better understand the human arterial system and hence, cure and/or prevent heart and arterial diseases. From a physical point of view, the blood flow in human arterial system can be considered as a fluid dynamics problem. In the past decades or so, a number of research works have been reported. This paper...
Hydrogenated and oxygenated nano-crystalline boron-doped diamond (BDD) films were prepared by hydrogen-plasma treatment and boiling in the strong acids, respectively. Surface characteristics of the two diamond films have been investigated by scanning electron microscopy (SEM) and Raman spectroscopy. In order to clarify detailed electronic structures of surface-treated nano-crystalline diamond films,...
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