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Study of ultrasound contrast imaging is of great importance in recent years thanks to its wide application in ultrasonic diagnosis. Plane wave imaging has been considered as a good method with high frame rate and low mechanical index. High frame rate can improve the temporal resolution of contrast imaging. Meanwhile, low mechanical index is essential to contrast imaging since high mechanical index...
Repairable inventory theory deals with inventory provisioning for components that can be repaired and reused instead of discard. For most repairable inventory models, maintenance time and fleet size are treated as exogenous variables that are presumably known or fixed. In fact maintenance optimization is widely used as an effective means to improve system availability. In addition, the number of in-service...
In this paper, a Differential Chaos Shift Keying system based on Generalized Frequency Division Multiplexing (GFDM-DCSK) is proposed to achieve a system that has higher energy efficiency than DCSK system, solves the delay problem of DCSK system and decreases the decoding complexity of the GFDM system. Neither channel state information nor channel estimation circuits are needed at the receiver side...
In this paper, we propose a new space-time block code (STBC) design in differential chaos shift keying (DCSK) communication system for scalable video transmission with unequal error protection (UEP) property. Extensive simulations are provided to demonstrate the performance gain of the proposed STBC-DCSK for scalable video transmission.
Sonovue is a kind of ultrasound contrast agent (UCA) with a stable shell made by lipid, within which is SF6. Due to the specific acoustic characteristics, UCA has been widely used in ultrasound diagnosis and therapy. In some cases, the 2nd harmonic wave of the scattered signal should be strong enough to help form a high quality image. To better utilize the bubbles to get enough intensity of the 2nd...
Lube oil system is very important to ensure the normal and stable operation of gas turbine. The faults of lube oil system would affect the performance of the whole gas turbine unit, and even lead to shut down. Through analyzing the operating characteristics and typical faults of lube oil system, this paper found that lube oil system possesses a nature of the diverse fault information, and the vague...
A distributed networked remote fault prognostic and diagnostic expert system for marine gas turbine is introduced which can realize cross-regional, multi-expert involved in collaborative decision-making mechanism. The expert system includes four layers namely the field data collection layer, the local condition monitoring layer, the network communication layer and the long-distance expert supports...
Lube system is one important auxiliary system of the gas turbine, and its operation stability directly related to the security and reliability of gas turbine. Typical faults and its mechanism are analyzed and the mathematic model of lube system is established in MATLAB/Simulink simulation environment, and the variable characteristic parameters of 4 typical faults which are cooler failure, filter block,...
In this paper, we propose a signal superposition layer multiplexing for the scalable video codec (SVC) coded video wireless broadcasting system. The SVC coded video layers are grouped into various groups and each group is encoded independently into a signal layer. The various signal layers are multiplexed using signal superposition and then transmitted. We introduce successive group decoder, originally...
With the rapid development of economy and society, timely access to effective information is becoming more and more significant. Intelligence and efficiency are the salient features of Smart City. Meanwhile, NASA World Wind, launched by National Aeronautics And Space Administration (NASA), an open source geographic software, is suitable as a development platform for Smart City. In this paper, we mainly...
Engine model plays an important role in design and testing process of engine and its electronic control system. Based on the methodology of mean valve model, a nonlinear marine liquefied petroleum gas (LPG) engine model is proposed for control-oriented application. The model includes throttle model, intake manifold dynamic model, fuel delivery model, crankshaft speed model, air fuel ratio predicting...
There is always a need for fast keypoint matching in applications. This paper focuses on the area of stereo vision and presents an algorithm for fast keypoint matching. We first estimate the potential match's position according the optical flow. Then the following matching process is restricted in a smaller region. Experiments show that our algorithm is effective and robust.
Gas turbine units are used in industrial applications more and more widely, and many people have researched widely in the fault diagnosis technology and the control technology for the gas turbine units. Simulation of Gas Turbine technology is the basis and the mathematical model of real-time is the basis of all relevant digital simulation. Using the neural network recognition technology of the radial...
Synchro-self-shifting (SSS) clutch is used widely in the ship propulsion system, power plants and other plants. It is one of the most important parts during the system and needed to be simulated in the simulation research of power plant system. However, the mathematical model of the SSS clutch has almost never been presented in the existing published research reports. It has been shown that the transmission...
This paper proposes a novel point pattern matching algorithm. Compared with most published works, the proposed algorithm is characterized by its outstanding real time performance, making it the only applicable algorithm for object tracking among the existing ones. Evolved with the definition of point pattern matching, analyzing the object tracking task, it presents a specific description of the novel...
Gas turbine modular non-linear mathematical model was established according to the volume of inertia law. By using the Park transformation, we set up the practical mathematical model such as generator, and some sub-shaft gas turbine generating set modular simulation program was also constructed based on Matlab / simulink simulation platform. The fuzzy PID control system was applied to the speed control...
In order to solve the difficult problem of large ship in track keeping and turning control, an improved control strategy for direct track intelligent control method is brought forward. The advantages of fuzzy control and PID control are made full use of and fuzzy PID control is applied on direct track control. Besides, a novel turning control strategy is adopted at turning point. Based on the above...
When applying mechanical stress to giant magnetostrictive material Terfenol-D, the magnetization along the direction of the applied stress varies due to the reverse magnetostrictive effect, which is called Villari effect. A magnetostrictive vibration sensor, which converts mechanical energy to electric energy, can be designed based on this effect. The dynamic model of the sensor was founded based...
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