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Automatic estimation of symbol parameters plays a prominent role in electronic reconnaissance and electronic warfare systems. How to estimate the code width without prior knowledge is an important problem in modulation recognition. Hilbert transform can effectively extract the instantaneous mutation characteristics of digital communication signals. In this paper, in order to demodulate MPSK underwater...
In this paper, we design a non-real-time underwater acoustic speech communication system similar to WeChat. Its communication rate reaches 2400bps when the communication distance is less than 5km. Due to the time-varying characteristic of underwater acoustic channel, we choose a short code named compensation code keying (CCK) soft spread spectrum without reducing the communication rate. As for speech...
Multi-sensor and information fusion technology based on Dempster-Shafer evidence theory are applied in the system of building fire alarm to realize early detecting and alarming. By using multi-sensor to monitor the parameters of fire process, such as light, smoke, temperature, gas and wet, the range of fire monitoring in space and time is expanded compared with single-sensor system. Then D-S evidence...
Based on generalized regression without known dependent variable, that is, without training samples, an evaluation model of the level of fire hazard is proposed, and a definite linear algorithm without iteration is given. The model realizes regression with latent variable using reasonable prescription constraint. The data example is given by means of convenient computation software. The method is...
This paper presents an extensive study of the timing results for a software implementation of the NIST-recommended elliptic curves over prime fields. We have designed and simulated the important field operations and point operations on NIST-recommended elliptic curves over prime fields in C++ based on the MIRACL library for the purpose of optimized speed and efficiency. Specific experiments are conducted...
This paper discusses the approach to make use of the four towers in the existing Sectionalized Loran Transmitting (SLT) antennas. Various configurations have been investigated to operate at lower frequency with reasonable behavior. Upward radiation is desired so horizontal polarization is used. A High Impedance Surface (HIS) is introduced between the antenna and the ground plane to improve performance...
With the decrease of global petroleum resources and the severity of worldwide air pollution, development for new technology of vehicles is becoming the focus in the world. In this paper, a new two-rotor doubly salient permanent magnet machine with multi-operational modes and control strategies is presented for assist/full hybrid electric vehicle (HEV) use. The machine topology and mathematic model...
Recently, a new concept of electric variable transmission has been introduced to the power split of hybrid electric vehicles to improve the fuel economy and reduce the emissions. This paper presented an electric variable transmission system which integrated a new two-rotor doubly salient permanent magnet motor. The motor topology, operation principles and electromagnetic performances are investigated...
Magnetic gear is becoming attractive due to its significant features, such as reduced acoustic noise, maintenance-free and inherent overloaded protection. In this paper, a magnetic-geared double salient permanent magnet machine is presented. The key is to newly add the flux-modulated teeth in the outer part of the stator pole. Both finite element analysis and experimental results show that the proposed...
Quality of urban space needs assessment to establish evaluation index system, and then summarize and evaluate the indicator. Based on the assessment of urban spatial quality of the actual situation, the article established the urban space quality evaluation system for quality assessment of urban space. This article also discussed the issue of a special aggregate index, and its practical significance...
Association rule mining makes interesting associations and/or correlations among large sets of data. Those associations can be refined as decision rules to be used and stored in a knowledge base system. In this paper, an approach based on association rule and knowledge base is proposed and implemented in the fault diagnosis of a transformer system. According to the features of association rule, the...
With the rapid growth of Chinese foreign trade, import & export trade frictions have become more frequent both at home and abroad. It's necessary to build a corresponding mechanism towards trade friction in order to create a fair trade environment for domestic companies. The target of this paper was to establish a Trade Variation Degree (TVD) model on the basis of the volume and amount of import...
For some applications such as electric vehicles, the reliability of AC motors is highly desirable, so the fault tolerant operation of motor drives becomes very important and attracts extensive attentions. In this paper, a new doubly salient flux memory motor with high fault-tolerant capability is investigated in details. Under the open-circuit fault, a remediation strategy, named field-reconfiguration...
The continuous berth allocation problem (BAPC) in this study is a more practical berth allocation problem (BAP) with the following key features of modern multi-user terminal (MUT): the quayside space is allocated to incoming ships in a continuous manner other than divided into discrete berths; the space and time are allocated to dynamically calling vessels by predicting the arrival time; the position...
In multi-agent-based e-commerce environments, like a social network, it is critical for buying agents to build trust with the selling agents in the virtual e-marketplaces so as to mitigate the possible harm inflicted by any dishonest sellers. However, traditional approaches for establishing trust in the physical world can no longer be used. This paper introduces a graphical representation approach...
In this paper, we present a description model of a trust network graph (TNG)-for multi-agent-based e-commerce systems, which is similar to the relationship network formed among people's transaction activities in the real-world. The method assumes that a multi-agent system in a domain constitutes a community and so the trust network is modelled by the means of a graph in the community. Several notations...
When dealing with high-dimensional datasets with fewer samples, feature selection and ensemble learning are two effective strategies. In this paper, we focus our attention on genetic algorithm based feature selection for ensemble learning. We use an improved GA algorithm (IGA) to reduce the dimensionality of the feature space, and then evaluate using bagging and Ada-Boost constructed by the reduced...
A successful Case-Based Reasoning (CBR) system lightly depends on how to design an accurate and efficient case retrieval mechanism. Brand extension is widely applied as a corporate strategy in the economic life. Some companies succeed in brand extension, some fail. So it is very important to study the case and theory of brand extension. Brand extension has its own background and reasons. Brand extension...
Evaluation method is a key part in the analysis of intelligent building features. In this paper, we propose an index system with 35 indexes to evaluate the architecture. Then we construct a generalized linear regression model on the condition that both dependent variables and regression coefficients can be estimated. Moreover we calculate the maximum likelihood of parameters by using EM algorithm...
With the need of scientific and rational evaluation mechanisms, green zoology building is the development trend of building construction. Based on the basic concept of the green zoology buildings with China's national conditions, this paper discusses the index system of green zoology building and its calculation. The feature of the calculation is that the second level index is a virtual no observational...
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