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VEHICLE SIMULATION MODEL FOR DEVELOPING AN INTELLIGENT SLOPE SHIFT STRATEGY 认领 引用 被引量：2
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作者 JinHui GeAnlin 《Chinese Journal of Mechanical Engineering》 EI CAS 2004年第2期193-196,共4页
With the rapid development of electronics and the growing demand for highervehicle performance, intelligent shift technology is becoming increasingly important, and itpromises to be a developing trend in vehicle autom... With the rapid development of electronics and the growing demand for highervehicle performance, intelligent shift technology is becoming increasingly important, and itpromises to be a developing trend in vehicle automatic transmissions, A new simulation model ispresented, which includes engine, powertrain, tire and vehicle dynamics models. Based on the model,simulation experiments are conducted to investigate the slope shift strategy. The data andconclusions obtained from the simulations are valuable contributions to the development of anintelligent slope shift strategy. 展开更多
关键词 Automatic transmission Intelligent shift Slope shift strategy Simulationmodel
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A Formal Approach to Protocol Interoperability Testing 认领 引用 被引量：2
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作者 郝瑞兵 吴建平 《Journal of Computer Science & Technology》 SCIE EI 1998年第1期79-90,共12页
Protocol Interoperability testing is an important means to ensure the interconnection and interoperation between protocol products. In this paper, we proposed a formal approach to protocol interoperability testing bas... Protocol Interoperability testing is an important means to ensure the interconnection and interoperation between protocol products. In this paper, we proposed a formal approach to protocol interoperability testing based on the operational semantics of Concurrent TTCN. We define Concurrent TTCN's operational semantics by using Labeled transition System, and describe the interoperability test execution and test verdict based on Concurrent TTCN. This approach is very helpful for the formation of formal interoperability testing theory and construction of general interoperability testing system. 展开更多
关键词 Interoperability testing concurrent semantics concurrent TTCN FDT-based application.
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A Formal Approach to Protocol Performance Testing 认领 引用 被引量：1
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作者 徐明伟 吴建平 《Journal of Computer Science & Technology》 SCIE EI 1999年第1期81-87,共7页
This paper proposes a formal approach to protocol performance test- ing based on the extended concurrent TTCN. To meet the needs of protocol perfor- mance testing, concurrent TTCN is extended, and the extended concurr... This paper proposes a formal approach to protocol performance test- ing based on the extended concurrent TTCN. To meet the needs of protocol perfor- mance testing, concurrent TTCN is extended, and the extended concurrent TTCN's operational semantics is defined in terms of input-Output Labeled Thansition Sys- tem. An architecture design of protocol performance test system is described, and an example of test cases and its test result are given. 展开更多
关键词 protocol performance testing extended concurrent TTCN opera tional semantics IOLTS
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Accuracy Analysis of the Adini Element for Biharmonic Equation 认领 引用 被引量：1
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作者 PingLUO QunLIN 《Acta Mathematica Sinica,English Series》 SCIE 2004年第1期135-146,共12页
In this paper, we consider the solution of the biharmonic equation using Adini nonconforming finite element, and report new results of the asymptotic error expansions of the interpolation error functionals and nonconf... In this paper, we consider the solution of the biharmonic equation using Adini nonconforming finite element, and report new results of the asymptotic error expansions of the interpolation error functionals and nonconforming remainder. These expansions are used to develop two extrapolation formulas and a series of sharp error estimates. Finally, the numerical results have verified the extrapolation theory. 展开更多
关键词 Adini nonconforming element Extrapolation Error expansion Biharmonic equation
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Relationship Between Support Vector Set and Kernel Functions in SVM 认领 引用 被引量：22
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作者 张铃 张钹 《Journal of Computer Science & Technology》 SCIE EI 2002年第5期549-555,共7页
Based on a constructive learning approach, covering algorithms, we investigatethe relationship between support vector sets and kernel functions in support vector machines(SVM). An interesting result is obtained. That ... Based on a constructive learning approach, covering algorithms, we investigatethe relationship between support vector sets and kernel functions in support vector machines(SVM). An interesting result is obtained. That is, in the linearly non-separable case, any sampleof a given sample set K can become a support vector under a certain kernel function. The resultshows that when the sample set K is linearly non-separable, although the chosen kernel functionsatisfies Mercer's condition its corresponding support vector set is not necessarily the subsetof K that plays a crucial role in classifying K. For a given sample set, what is the subsetthat plays the crucial role in classification? In order to explore the problem, a new concept,boundary or boundary points, is defined and its properties are discussed. Given a sample setK, we show that the decision functions for classifying the boundary points of K are the sameas that for classifying the K itself. And the boundary points of K only depend on K and thestructure of the space at which K is located and independent of the chosen approach for findingthe boundary. Therefore, the boundary point set may become the subset of K that plays acrucial role in classification. These results are of importance to understand the principle of thesupport vector machine (SVM) and to develop new learning algorithms. 展开更多
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Real-Time Collision-Free Path Planning for Robots in Configuration Space 认领 引用
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作者 李伟 张钹 《Journal of Computer Science & Technology》 SCIE EI 1994年第1期37-52,共16页
Collision-free path planning for an industrtal robot in configuration space requires mapping obstacles from robot's workspace into its configuration space. In this paper ,an approach to real-time collision-free pa... Collision-free path planning for an industrtal robot in configuration space requires mapping obstacles from robot's workspace into its configuration space. In this paper ,an approach to real-time collision-free path planning for robots in configuration space is presented. Obstacle mapping is carried out by fundamental obstacles defined in the workspace and their images in the configuration space. In order to avoid dealing with unimportant parts of the configuration space that do not thect searching a collision-free path between starting and goal configurations, we construct a free subspace by slice configuration obstacles. In this free subspace, the collision-free path is determined by the A algorithm. Finally, graphical simulations show the effectiveness of the proposed approach. 展开更多
关键词 Motion planning collision avoidance robotics graphical simulation
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Rendezvous Facilities in a Distributed Computer System 认领 引用
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作者 廖先湜 金兰 《Journal of Computer Science & Technology》 SCIE EI 1995年第2期188-192,共5页
The distributed computer system described in this paper is a set of computernodes interconnected in an interconnection network via packet-switching interfaces.The nodes communicate with each other by means of message-... The distributed computer system described in this paper is a set of computernodes interconnected in an interconnection network via packet-switching interfaces.The nodes communicate with each other by means of message-passing protocols. Thispaper presents the implementation of rendezvous facilities as highlevel prhoitives provided by a parallel programming language to support interprocess cornmunication andsynchronisation. 展开更多
关键词 Rendevous packet-switching interface message-passing protocols interprocess communication and synchronization high-level primitive parallel programming language interconnection network
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A Boundary Element Method for Simulation of Deformable Objects 认领 引用
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作者 徐美和 唐泽圣 《Journal of Computer Science & Technology》 SCIE EI 1996年第5期497-506,共10页
In this paper, a boundary element method is first applied to real-time animation of deformable objects and to simplify data preparation. Next, the visible external surface of the object in deforming process is represe... In this paper, a boundary element method is first applied to real-time animation of deformable objects and to simplify data preparation. Next, the visible external surface of the object in deforming process is represented by B-spline surface, whose control points are embedded in dynamic equations of BEM. Finally, the above method is applied to anatomical simulation. A pituitary model in human brain, which is reconstructed from a set of anatomical sections, is selected to be the deformable object under action of virtual tool such as scalpel or probe. It produces fair graphic realism and high speed performance. The results show that BEM not only has less computational expense than FEM, but also is convenient to combine with the 3D reconstruction and surface modeling as it enables the reduction of the dimensionality of the problem by one. 展开更多
关键词 Physically based modeling animation simulation boundary element method B-spline surface representation
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Determination of Horizontal Motion through Optical Flow Computations 认领 引用
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作者 俞志和 FrankM.Caimi 《Journal of Computer Science & Technology》 SCIE EI 1997年第2期133-144,共12页
For intelligent / antonomous subsea vehicles, reliable short-range horizontal positioning is difficult to achieve, particularly over flat bottom topography.A potential solution proposed in this paper utilizes a passiv... For intelligent / antonomous subsea vehicles, reliable short-range horizontal positioning is difficult to achieve, particularly over flat bottom topography.A potential solution proposed in this paper utilizes a passive optical sensing method to estimate the vehicle displacement using the bottom surface texture.The suggested optical flow method does not require any feature correspondeuces in images and it is robust in allowing brightness changes between image frames. Fundamentallyt this method is similar to correlation methods attempting to match images and compute the motion disparity. However, in correlation methods, searching a neighbor region blindly for best match is lengthy. Main contributions of this paper come from the analysis showing that optical flow computation based on the general model cannot avoid errors except for null motion although the sign of optical flow keeps correct, and from the development of an iterative shifting method based on the error characteristics to accurately determine motions. Advantages of the proposed method are verified by real image experiments. 展开更多
关键词 Machine vision optical flow motion disparity undersea vehicle
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