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This paper proposes a position detection approach to achieve the sensorless control of the planar switched reluctance motor (PSRM) using the current injection method. The mechanical structure and mathematical model of the PSRM are first given. The principle of the sinusoidal current injection method is then clarified to detect the position of the sensorless PSRM. Furthermore, the selection of the...
Recently, those methods of protecting application from crack have a great development. Code obfuscation, dynamic link library, software shelling, those methods all have different levels of innovation and optimization [1]. However, various software crack technology also became increasingly mature. Static code analysis cooperating with dynamic code analysis makes mostly code reinforcement method failed...
In this article, a novel sliding mode control is proposed for synchronization of two fractional order chaotic systems. The proposed method uses the Radial Basis Function Neural Network(RBFNN) and proportional-integral(PI) parallel control to replace the traditional switching law of adaptive sliding mode control(ASMC). The advantages of the control method are as follows: firstly, the continuous nonlinear...
A dual-beam Cassegrain antenna at 360GHz was designed and manufactured for radiation measurement at submillimeter wave band. A diagonal horn was selected as feed. Two feeds were set side by side for object locating. Comparative tests were taken between the Cassegrain antenna and a diagonal horn antenna through a passive detecting system. The parameters of Cassegrain antenna such as gain are estimated.
This article investigates the control problem of rejection and tracking unknown sinusoidal signals for linear timeinvariant systems. The derived controller is in terms of state-derivative feedback since the derivative of the state rather than the state can be directly measured in some cases. Meanwhile, in order to reject and track the unknown sinusoidal signals simultaneously, we identify their models,...
Network security situation awareness is a comprehensive technology which can obtain and process the information of security, and it plays an important role in the field of network security. As the traditional network security situation awareness methods mainly forecast the situation value based on mathematical models, which will result in the ignorance of the dynamic changes of network security situation...
For solving the problems that random objects are feature point and obstacles, this paper presents an efficient approach for Path Planning of Robot based on Simultaneous Localization and Mapping (SLAM) algorithm. Low-cost ultrasonic sensors as the design scheme of distance measuring is adopted. Aiming to obtain the probability of grid map update effectively, an improved Bayesian formula is proposed...
In order to solve the multi-objective optimal grid workflow scheduling problems with various QoS constraints, SPEA2+ is employed to optimize the scheduling performance. The paper proposes a multi-objective optimal grid workflow scheduling algorithm with QoS constraints, namely GWSA. The proposed algorithm, based on the rich-construct AGWL grid workflow model, considers five-dimensional QoS parameters,...
With the aim of getting more accurate and more reliable stock price predicted results, this paper proposes an effective method which is fuzzy rough set and data mining technology. Firstly, stock prices were classified to some groups according to their different time attribute by using fuzzy set and rough set means. Then we calculated truth values of these groups respectively based on the given fuzzy...
This paper proposed a media access control (MAC) protocol for distributed cognitive radio network, which can work effectively in congested network by dynamic spectrum allocation. Cognitive nodes user chose the communication channel by negotiation, considering the channel usage of neighbours. The scheme can reduce the interference between nodes by selecting proper channel, improve the throughput of...
Based on UDP and MFA, we propose a new unsupervised feature extraction algorithm, LMP (Local Marginal Projection), which is built on local quality. It measures the non-local quantities by the nearest sample between two locals. The goal of LMP is to find a projection that can maximize the distance of the sample in the same local and in different locals, in which case, the data can be projected into...
In this paper, the VRPTWRV (VRPTW with Re-used Vehicle) was presented and a mathematical programming model with multiple objects was constructed correspondingly. The heuristic information and Pseudo-random probability selection rule are improved according to the principle of serving customers with earlier service beginning time, shorter service time and earlier ending time firstly based on Ant Colony...
A Ka band Cassegrain monopulse antenna has been designed and measured. The tapered rod antennas are used as the feeds of the Cassegrain antenna because their blockage is small and their bandwidths are very wide. The measurements show that the gain of sum pattern is 28 dBi, the sidelobe levels of the sum pattern are less -15 dB, the null depths of the difference pattern are less then -25 dB and the...
Millimeter wave synthetic aperture radiometer (MMW-SAR) technology can use phase information of electromagnetic wave radiating from target, and will be real-time imaging with less receiver elements. However MMW-SAR is limited to 2D imaging due to passive regime nowadays, lack of range information of target, which is very unfavorable for target detection and identification, thus this paper presents...
This paper proposes a two-phase algorithm of image projection discriminant analysis. The new discriminant method is composed of feature extraction by on maximum margin criterion (MMC) and Fisher discriminant analysis (FDA). The algorithm includes two stages: firstly, the feature extraction based on maximum margin criterion (MMC) is employed to condense the dimension of image matrix; Then Fisher discriminant...
By the idea of manifolds learning, this paper presents a new method of dimensionality reduction of high dimensional data. The trait of the method is to exploit image matrixes to directly construct the local scatter matrix and the nonlocal scatter matrix. Its discriminant criterion function is characterized by maximizing the difference between the nonlocal scatter and the local scatter after the samples...
From the request of the Customs house for detecting things hidden in the clothes, base on the specific characteristics of the different technical scheme on PMMW imaging system, an imaging scheme that uses broad-band multi-beam antenna in one dimension and machine scanning in another dimension has been selected. The experimental system has been designed and some examination has been done. The result...
Radio frequency identification (RFID) is expected to become pervasive and ubiquitous, as it can be embedded into everyday items as smart labels. A typical scenario of exploiting RFID is supply chain. The RFID based supply chain management yields convenience, efficiency and productivity gains. However, RFID systems create new risks to security and privacy. We briefly present the current solutions to...
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