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Anti-aircraft artillery servo system requires high tracking accuracy and strong robustness. In this paper, an algebraic tuning rule is presented for fractional PIλ controllers to control anti-aircraft artillery. A group of suitable parameters can be chosen out by drawing the curve describing relation between gain kp, ki and integral order λ when the crossover frequency and phase margin are given....
To study a comprehensive performance of communication and related equipment manufacturing industry listed company based on factor analysis, we select fourteen major financial indexes representing the companies' performance and then give the objective evaluation through comprehensive scores. Finanlly, we give some useful suggestions to improve the comprehensive performance of companies.
Moving objects continuously generate large amounts of spatio-temporal data. Maintaining and querying the location information of moving objects are a crucial problem. This paper focuses on the query problems of indexing structure for moving objects. The main focus of query processing is retrieval of approximate future movement information about moving objects that may be unavailable. First, a VPMR-tree...
In geographic information system (GIS), fast and efficiently indexing moving objects are a crucial issue in several application domains, such as LBS, intelligence transportation and digital battle. In this paper, a new index structure, PQR-tree, is proposed to fast update and efficiently index the present or near future positions of constrained moving objects based on the characters of moving objects...
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