This Paper discusses how to design fuzzy controllers of chasing spacecraft in relative motion. Fuzzy controllers are designed to apply to fuzzy logic, and simulation results illustrate the feasibility of the controlle...
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ISBN:
(纸本)0780384032
This Paper discusses how to design fuzzy controllers of chasing spacecraft in relative motion. Fuzzy controllers are designed to apply to fuzzy logic, and simulation results illustrate the feasibility of the controllers. Furthermore, fuzzy control method and classical methods are compared with each other and the results show that fuzzy controllers have robustness.
This paper describes a method of test data compression for a given test set using statistical encoding. In order to maximize the effectiveness of statistical encoding, the method first converts some specified input va...
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This paper describes a method of test data compression for a given test set using statistical encoding. In order to maximize the effectiveness of statistical encoding, the method first converts some specified input values in the test set to unspecified ones without losing fault coverage, and then reassigns appropriate logic values to the unspecified inputs. Experimental results for ISCAS-89 benchmark circuits show that the proposed method can on the average reduce the test data volume to less than 25% of that required for the original test set.
In this paper, we define and study a novel text mining problem, which we refer to as Comparative Text Mining (CTM). Given a set of comparable text collections, the task of comparative text mining is to discover any la...
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ISBN:
(纸本)1581138881
In this paper, we define and study a novel text mining problem, which we refer to as Comparative Text Mining (CTM). Given a set of comparable text collections, the task of comparative text mining is to discover any latent common themes across all collections as well as summarize the similarity and differences of these collections along each common theme. This general problem subsumes many interesting applications, including business intelligence and opinion summarization. We propose a generative probabilistic mixture model for comparative text mining. The model simultaneously performs cross-collection clustering and withincollection clustering, and can be applied to an arbitrary set of comparable text collections. The model can be estimated efficiently using the Expectation-Maximization (EM) algorithm. We evaluate the model on two different text data sets (i.e., a news article data set and a laptop review data set), and compare it with a baseline clustering method also based on a mixture model. Experiment results show that the model is quite effective in discovering the latent common themes across collections and performs significantly better than our baseline mixture model.
This paper reports a new dynamic programming environment for FDNet. The FDNet was designed as a flexible system that can accept new functions by reforming the network itself. Another feature that the relation networks...
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ISBN:
(纸本)0780384636
This paper reports a new dynamic programming environment for FDNet. The FDNet was designed as a flexible system that can accept new functions by reforming the network itself. Another feature that the relation networks in FDNet are described by XML can help to expand the network scale easily. Our new dynamic editing system uses the feature, and communicates via TCP/IP network for editing. Some trials reported in this paper shows a capability of an automatic self-editing function in the imitating robot system.
CoGIS is a platform that supports multiple users to edit space data cooperatively in a distributed environment. By using this platform, users can request and retrieve space data remotely, edit and process space data c...
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The packet-level traffic characteristics in the Internet are so complex that it is natural to do traffic engineering (TE) and control at the flow level. The emerging Multi-Protocol Label Switching (MPLS) has introduce...
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The packet-level traffic characteristics in the Internet are so complex that it is natural to do traffic engineering (TE) and control at the flow level. The emerging Multi-Protocol Label Switching (MPLS) has introduced an attractive solution to TE in IP networks. The main objective of this paper is to balance traffic at the flow level among the parallel Label Switched Paths (LSPs) in MPLS networks. We first introduce a multipath load-balancing model at the flow level. In this model, each LSP is modeled as an M/G/1 processor-sharing queue. Based on the analysis of the model, we propose a heuristic but efficient mechanism that is implemented only at the ingress Label Switched Routers (LSRs) and egress LSRs in the network. Extensive simulations using NS2 are performed with MPLS modules. The simulation results show that the load through the network is well balanced so that the network throughput is improved and the delay is decreased significantly.
This paper addresses optimal periodic training signal design for frequency offset estimation in frequency selective multipath Rayleigh fading channels. For a fixed transmitted training signal energy and within a fixed...
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This paper addresses optimal periodic training signal design for frequency offset estimation in frequency selective multipath Rayleigh fading channels. For a fixed transmitted training signal energy and within a fixed length block, the optimal periodic training signal structure (the optimal location of identical training sub-blocks) and the optimal training sub-block signal are presented. The optimality is based on the minimum Cramer-Rao bound (CRB) criterion. Based on the snap-shot CRB, the optimal periodic training structure is derived. The optimal training sub-block signal is obtained by utilizing the average CRB and the received training signal statistics. The optimal training structure with optimal training signals achieves substantial performance improvement over non-optimal training structure with non-optimal training signals.
This paper demonstrates a successful application of wavelength division multiplexing (WDM) to the avionics environment to support analog RF signal transmission. We investigate the simultaneous transmission of four RF ...
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