The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper considers the depth control problem of autonomous underwater vehicles (AUVs) in discrete time. A neural-network-based deterministic policy gradient (NNDPG) controller is proposed by combining the deterministic policy gradient theorem with neural networks. Two networks, evaluation network and policy network, are designed to respectively approximate the long-term cost function and policy...
In order to realize the real time tracking and prediction of ultra-short term power of PV power station, according to the actual monitoring data of the photovoltaic power station, an ultra-short term power forecasting model based on autoregressive moving average (ARIMA) and support vector regression (SVR) is established in this paper. The ARIMA model has good adaptability to the linear trend. The...
Multivariate time series (MTS) exist in many applications. Due to all kinds of interference factors, missing data in MTS is inevitable. Aiming at this problem, a filling method based on least squares support vector machine (LSSVM) is proposed. Firstly, for the series containing missing data, similar series are searched, and its results are viewed as the training set. Secondly, to make use of the correlation...
The aging of quartz crystal resonators has been a key requirement of the product development and broad applications in signal generation and processing of many mission and life critical functions. Among many aging models for the analysis of long-term behavior of quartz crystal resonators, the Arrhenius model is widely accepted for most materials in engineering applications and physical process including...
Vehicle identification is one of the frequently studied problems in video surveillance. Commonly, identifying an unknown vehicle object requires a large amount of training instances. Unfortunately, in the large parking scenario, the cost may be prohibitively expensive because of the finitely waiting time from the car owners. In this paper, we show that it is possible to identify a registered vehicle...
A small-signal model based on droop control and utilized in microgrid of photovoltaic (PV) inverters is designed in this paper. The parallel-inverter system composed of two 1kVA PV inverters with no communication line is built on the basis of small-signal model. The influence of droop coefficients on the system stability and dynamic response ability is analyzed by utilizing root locus analysis in...
Multi-port isolated H-bridge converter has the features of high voltage conversion ratio, bidirectional power flow and high-power capacity, which is suitable to be integrated into DC microgrids. This paper uses three-port isolated H-bridge converters as the interfacing converters in power generation units which comprise distributed generation (DG) and energy storage (ES) in DC microgrid. The topology...
In order to study the dynamic characterization of a new type zero leakage valve with double direction, in this paper, we simplify the model of the new type zero leakage valve with double direction and establish a mathematical dynamic model of single degree of freedom torsion system. Based on the theory, the software of Adams was adopted to establish the dynamic model of virtual prototype, and the...
In order to study the vibration characteristics of new type two-way zero leakage valve, multi-degrees of freedom dynamic mathematical model was established and solved based on the principle of the valve. The virtual prototype model of the valve was built with the Adams. With the help of the vbration module the forced vibration analysis was established, and the frequency response of the system was...
It is always desirable to improve the quality of a global classification model with the existence of other models. In this work, bucket learning methodology is first proposed to improve the model quality through enhancing its local patterns. We formally define the concept of slab as a tri-tuple <D, M, R>, which unifies the data view, model view and evaluation view of a data mining task. The...
In this paper, power control problem in cognitive user is modeled as a non-cooperative game model. To improve the cognitive users' performance, this paper presents a new pricing function based on double-interference punishment (DIP) for non-cooperative power control game in a CDMA cognitive radio network. The model reduces the minimum Signal to Interference plus Noise Ratio (SINR) satisfied the requirement...
This paper discusses teaching reform ideas in the ldquoscientific computingrdquo education by means of modeling and simulation, that can make students get a better understanding of the background, concept and design of each numerical algorithm in ldquoscientific computingrdquo education, and it will help them enhance their self-learning ability and exploration ability.
Aimed at large time-delay and time-varying characteristics of regenerative magnesium reduction furnace, Smith-fuzzy self-tuning PID (SF-PID) control algorithm is proposed. The algorithm takes the advantage of Smith predictive control for overcoming a large time-delay and fuzzy self-tuning PID control algorithm for achieving perfect control effect on time-varying, noise disturbance characteristics...
The method of ldquoLogical Effort Delay Modelrdquo allows designers to quickly estimate delay time and optimize logic paths. But the previous variances of logical effort models do not mention how to handle process, voltage, and temperature (PVT) variations appropriately, which may induce a serious misestimate. According to simulation results, delay time increases 21% while temperature increasing from...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.