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High-speed train is supplied by alternating current (AC) power and bases on single-phase four quadrant (4Q) converter as one necessary part of the ‘AC-DC-AC’ transform process. The discrete mathematical model for a single-phase 4Q converter is derived with small disturbance method and digital control delay effect is considered in 4Q converter modeling and analysis. Focusing on stability characteristics...
We propose an analytical, time-domain model for microring modulators, which encompasses pn-junction and resonator dynamics. It shows excellent agreement with experiment for high frequency operation beyond 20 GHz. Pulse-amplitude modulation is predicted for up to 80 Gb/s.
Wind power prediction is of great significance to the safe and stable operation of the power system. The key factor of wind power prediction is the selection of prediction model. This paper chooses support vector machine (SVM) as the wind power prediction model and applies an improved grid search method to optimize the parameters of C and g in SVM model. The model is able to predict the real-time...
Waterway is a kind of narrow water area which connects mainland or islands. It acts the role of channel or passage, as the only path through some area. Usually, waterways exist with the islands nearby in the sea. So the spatial relationship between islands and waterways is very important. In this paper, spatial interaction model is used to describe the relationship and the importance of the location...
A direct way to get the throughput of an asynchronous circuit would be through simulations. However, traditional simulation-based throughput analysis methods cannot achieve both accurate in estimates and quick in runtimes. In this paper, we propose an event-driven simulator to estimate the throughputs of asynchronous pipelines. Experimental results show the efficiency of the method.
The simulation on air-solid two phase flow mechanism in sieving set-up of a new-model hammer mill was performed using software FLUENT, and the relation ship of the material-sieving efficiency and the factors were analyzed in this paper, It is provided a theoretical basis for the further optimization design.
From this perspective, the market function realization of technology innovation of the market mechanism of system analysis, constructing the technical innovation under the perspective of market driving technology market model for technological innovation power be laid a theoretical foundation. In consideration of the innovation subject risk attitudes, yields of factors such as the basis of time interval,...
In our model, firstly, we predict the residence of the offender based on the locations of the last crime scenes with three methods (distance analysis: the location that has the shortest distance to each crime site, circle fitting, probability theory), secondly, we predict the time of the next crime based on previous data with the method of fitting a straight line, next, we predict the location of...
In this paper, the authors discussed in detail about the framework of integrating Radio Frequency Identification (RFID) with Building Information Modeling (BIM) technologies. The proposed framework can be used in the computer-aided design, manufacturing, engineering, and installation processes. In specific, this paper explained how to use RFID technology for structural steel components, such as a...
In Web Services composition, effectively appraising of QoS of Web Services is a main method of service selecting. Most of current QoS models do not consider the uncertainty, subjectivity, interacting and business relativity of the non-functional attributes of services. And they lack of the deep and thorough analysis of user requirements. Thus they are not able to provide sufficient support to service...
The multiband behavior of the fractal Sierpinski Gasket antenna is studied in this paper with an iterative method. Based on a Sierpinski Gasket antenna which has finite iterations, a multiport network iterative model has been built to analysis the S parameters. The model is simple, but the computational result has prediction in antenna's multiband. Comparing with measured data from other papers',...
We derive analytic expressions for the small-signal modulation response of the transistor laser (TL) operating in the common-emitter (CE) and common-base (CB) configurations. We compare the performance (current gain and small-signal modulation bandwidth) of the TL in these two modes of operation. The CE operation results in a small-signal modulation response with the same relaxation oscillation limitations...
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