In this paper,the sensorless control of the interior permanent magnet synchronous motors using the sliding mode and the binary observers are ***,the structure of the above observers only uses the voltage *** the param...
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In this paper,the sensorless control of the interior permanent magnet synchronous motors using the sliding mode and the binary observers are ***,the structure of the above observers only uses the voltage *** the parameters of the dynamic equation such as machine inertia or viscosity friction coefficient are not well known and these values can be easily changed during normal operation,there are many restrictions in the actual *** order to estimate the rotor speed and position,the Lypunov function is *** performances of each observer are confirmed by the experiments
In this paper, the sensorless control of the interior permanent magnet synchronous motors using the sliding mode and the binary observers are compared. Also, the structure of the above observers only uses the voltage ...
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In this paper, the sensorless control of the interior permanent magnet synchronous motors using the sliding mode and the binary observers are compared. Also, the structure of the above observers only uses the voltage equation. Since the parameters of the dynamic equation such as machine inertia or viscosity friction coefficient are not well known and these values can be easily changed during normal operation, there are many restrictions in the actual implementation. In order to estimate the rotor speed and position, the Lypunov function is used. The performances of each observer are confirmed by the experiments.
In this paper,the sensorless control of the interior permanent magnet synchronous motors using the sliding mode and the binary observers are ***,the structure of the above observers only uses the voltage *** the param...
详细信息
In this paper,the sensorless control of the interior permanent magnet synchronous motors using the sliding mode and the binary observers are ***,the structure of the above observers only uses the voltage *** the parameters of the dynamic equation such as machine inertia or viscosity friction coefficient are not well known and these values can be easily changed during normal operation,there are many restrictions in the actual *** order to estimate the rotor speed and position,the Lypunov function is *** performances of each observers are confirmed by the experiments
Based on the located information and graph theory, a distributed sensor network model is introduced. The relationship between data transmission and fusion between nodes are described with Delaunay triangulation. And V...
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Based on the located information and graph theory, a distributed sensor network model is introduced. The relationship between data transmission and fusion between nodes are described with Delaunay triangulation. And Voronoi diagrams have been used in the description of coverage region of nodes. With the model, disadvantages of existing located system based on a fixed infrastructure could be overcome.
Under limited channel capacity condition, this study investigates a combined source and channel coding algorithm providing a uniform video transmission rate to achieve better system performance in wireless MIMO system...
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Under limited channel capacity condition, this study investigates a combined source and channel coding algorithm providing a uniform video transmission rate to achieve better system performance in wireless MIMO systems. In the proposed algorithm, we applied MPEG2 video source coding scheme with convolutional channel coding as well as space-time block coding techniques, associated with BPSK/QPSK modulation method, to improve video transmission performance. The proposed algorithm assigned rates to MPEG2 source code and convolutional channel code, combined with space-time block coding schemes based upon the feedback information from performance control unit (PCU) under channel capacity limitation, which ensures the given system can achieve better performance compared to a conventional system.
More and more large amounts of data shared with researchers and workstations worldwide are generated by scientific experiments and engineering applications. High performance grids aim at facilitating the distribution ...
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ISBN:
(纸本)9781424439027
More and more large amounts of data shared with researchers and workstations worldwide are generated by scientific experiments and engineering applications. High performance grids aim at facilitating the distribution of such data to geographically remote places. For high performance data grids where users require remote access to large files, dynamic replication is an efficient method to improve performance. In this paper, Fast Cascading, a new dynamic replication algorithm, is proposed for the multi-tier Data Grid. The simulation results obtained by Simulator OptorSim which has been modified show that this algorithm can reduce the average response time of data access greatly for random access pattern compared with other algorithms,such as Fast Spread, LRU and Economy-Zipf dynamic replication strategy, and the gain increases with the number of jobs submitted.
Survivability and reliability are critical for the operation of shipboard power system both in normal and damage conditions. This paper presents a novel dynamic reconfiguration approach for shipboard power system by u...
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Survivability and reliability are critical for the operation of shipboard power system both in normal and damage conditions. This paper presents a novel dynamic reconfiguration approach for shipboard power system by using multi-agent system. With the similar topology of the shipboard power system, the multi-agent system is generalized to constraint satisfaction problem (CSP). The environment- reactive rules-agents (ERA) approach, which is multi-agent oriented, is used to support the organization formation behavior in dynamic reconfiguration. The effectiveness of the proposed approach is illustrated by test results in a reduced shipboard power system.
A document type definition (DTD) describes the structure of a set of similar XML documents and serves as the schema for XML documents. Consistency of DTDs is an important topic in XML research. A DTD is consistent if ...
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A document type definition (DTD) describes the structure of a set of similar XML documents and serves as the schema for XML documents. Consistency of DTDs is an important topic in XML research. A DTD is consistent if and only if there is some valid XML document conforming to the DTD, while a DTD is inconsistent if there is no XML document conforming to it. Inconsistent DTDs are of no use and should be avoided as well as possible. However, a consistent DTD may have inconsistent sub-structures that no valid XML data could conform to. This kind of DTDs should be avoided as well as inconsistent DTDs. In order to solve this problem, a new notion of 'element consistency in a DTD' is put forward in this paper. Based on 'element consistency in a DTD', notion of 'absolute consistent DTDs', which means consistent DTDs with no inconsistent sub-structures, is discussed. Furthermore, a new DTDs absolute consistency checking algorithm, with which a DTD can be determined absolute consistent or not consistent quickly, is also offered. The worst time complexity of the new DTDs absolute consistency checking algorithm is O(n).
We introduce a method for modeling cancer diagnosis at the molecular level using a Chinese microarray gastric cancer dataset. The method combines an artificial neural network with a decision tree that is intended to p...
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We introduce a method for modeling cancer diagnosis at the molecular level using a Chinese microarray gastric cancer dataset. The method combines an artificial neural network with a decision tree that is intended to precede standard techniques, such as classification, and enhance their performance and ability to detect cancer genes. First, we used the relief algorithm to select the featured genes that could unravel cancer characteristics out of high dimensional data. Then, an artificial neural network was employed to find the biomarker subsets with the best classification performance for distinguishing cancerous tissues and their counterparts. Next a decision tree expression was used to extract rules subsets from these biomarker sets. Rules induced from the best performance decision tree, in which the branches denote the level of gene expression, were interpreted as a diagnostic model by using previous biological knowledge. Finally, we obtained a gastric cancer diagnosis model for Chinese patients. The results show that using the Chinese gastric biomarker genes with the diagnostic model provides more instruction in biological experiments and clinical diagnosis reference than previous methods.
There are some fatigue damage estimation methods of an austenitic stainless steel that uses martensitic transformation. For instance, those are the remanent magnetization method, the excitation method, and so on. Thos...
There are some fatigue damage estimation methods of an austenitic stainless steel that uses martensitic transformation. For instance, those are the remanent magnetization method, the excitation method, and so on. Those two methods are researched also in our laboratory now. In the remanent magnetization method, it is well known that the relationship between fatigue damage and the remanent magnetization is simple, clear, and reproducible. However, this method has the disadvantage to need a special magnetizer. Then, this method cannot be easily used at the job site such as the factory. On the other hand, as the special magnetizer is unnecessary, the excitation method can be easily used at the job site. But, this method has some disadvantages shown as follows. For instance, the output signal of this method is small. And the surface state of the specimen strongly influences the noise component of the output signal. It is well known that the inductance of a pancake type coil put on the metallic specimen changes according to the electromagnetic properties of the metallic specimen. In this paper, the method of evaluation of fatigue damage of an austenitic stainless steel (SUS304) by using a change of an inductance of a pancake type coil is shown. In addition, the fatigue evaluation performance of this method is described.
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