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QUALITATIVE SPATIO-TEMPORAL DATABASE

QUALITATIVE SPATIO-TEMPORAL DATABASE

引用

2006 International Conference on Machine Learning and Cybernetics(IEEE第五届机器学习与控制论坛)

作者： SHENG-SHENG WANG DA-YOU LIU JUAN CHEN HAI-YANG JIA Key Laboratory of Symbolic Computing and Knowledge Engineering of Ministry of Education College of Computer Science and Technology Jilin University ChangchunChina

The traditional spatio-temporal database stores the quantitative data such as coordinate. But the qualitative information is more close to human thought and requires less storage space and process time. The previous qualitative spatio-temporal systems were all prototype systems which did not support general spatio-temporal relation model and data input. We design the qualitative spatio-temporal database (QSTDB) based on spatio-temporal reasoning. A general spatio-temporal relation framework is put forward and applied to QSTDB. GML data can be converted to QSTDB as input. Thus QSTDB is compatible to most current spatio-temporal relation models and spatio-temporal *** can be applied to qualitative spatio-temporal query,spatio-temporal ontologies, spatio-temporal data mining and way finding systems etc..

关键词： Qualitative Spatio-temporal Database Spatio-temporal Reasoning General Spatio-temporal Relation Model Composition Table

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A New Position Updating Algorithm for Moving Objects

A New Position Updating Algorithm for Moving Objects

引用

International Multi-Symposiums on Computer and Computational Sciences (IMSCCS)

作者： Xinying Wang Shengsheng Wang Zhengxuan Wang Tianyang Lv Xizhe Zhang College of Computer Science and Technology Key Laboratory of Symbolic Computing and Knowledge Engineering of Ministry of Education Jilin University Changchun China

Continuous queries are important in moving objects databases and spatio-temporal reasoning. The traditional synchronous updating algorithms of moving object pervasively focus on improving queries' execution efficiency, while ignore the fact that the communication cost is also the bottleneck for improving query efficiency. We propose an asynchronous updating algorithm for continuous queries of moving objects. Three types of continuous range queries are discussed in the paper. Theoretical analysis and experiment results show that our algorithm substantially outperforms the traditional synchronous updating algorithms at aspects of monitoring accuracy, communication cost and CPU load balance

关键词： Costs Geographic Information Systems Spatiotemporal phenomena Vehicles Spatial databases Artificial intelligence Memory management Telecommunication computing Hardware educational institutions

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A Hybrid Markov Model Based on EM Algorithm

A Hybrid Markov Model Based on EM Algorithm

引用

International Conference on Control, Automation, Robotics and Vision (ICARCV)

作者： Xue-gang Yu Yan-heng Liu Da Wei Ling-yin Lei Key laboratory of symbolic computation and knowledge Engineering of ministry of education Jilin University Beijing China

Order-k Markov model can be used in many fields such as natural language understanding, coding, mobile path prediction and so on to make prediction and then control. But the model has to face the problem of state space expansion. Taking the mobile path prediction as the research background, the paper firstly proposes a step-k Markov model and validates its feasibility. Secondly, a hybrid Markov predictor model is put forward based on the step-k Markov model. The complexity of the hybrid Markov model is O(N) while the order-k Markov model is O(N 2 ). And the memory demand of the hybrid Markov model is O(N 2 ) while order-k Markov model is O(N 3 ). Finally, it is proved that the hybrid Markov predictor can get close performance with order-k Markov predictor at much lower expense by conditional entropy analysis and user mobility data analysis. Also it can alleviate the zero probability problem in order-k Markov model to some extent. The hybrid Markov predictor is more practical than order-k Markov predictor under WLAN

关键词： Predictive models State-space methods Entropy Mobile computing Wireless LAN Natural languages Accuracy Wireless networks educational institutions Equations

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ASYNCHRONOUS UPDATING ALGORITHM FOR CONTINUOUS MOVING OBJECTS QUERIES

ASYNCHRONOUS UPDATING ALGORITHM FOR CONTINUOUS MOVING OBJECT...

引用

2006 International Conference on Machine Learning and Cybernetics(IEEE第五届机器学习与控制论坛)

作者： XIN-YING WANG SHENG-SHENG WANG ZHENG-XUAN WANG College of computer science and technology Key laboratory of symbolic computing and knowledge engineering of ministry of education Jilin University Changchun 130012China

Continuous queries for moving objects are becoming more and more important due to the increasing number of application domains that deal with moving entities. The asynchronous updating algorithm for continuous queries of moving objects is superior to synchronous updating algorithms in communication cost. By improving Haibo Hu's rectangle safe region strategy we proposed a new continuous queries algorithm. Circle safe region and dynamic interval are adopted in our algorithm. Theory proof and experiment results show that our algorithm substantially outperforms the traditional periodic monitoring and the rectangle safe region algorithms in terms of monitoring accuracy, communication cost and CPU time. Furthermore, the mobile terminals need not have any computation ability in our algorithm.

关键词： Moving objects database continuous spatial query spatio-temporal reasoning

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Improved Algorithm for Continuous Moving Objects Queries

Improved Algorithm for Continuous Moving Objects Queries

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Firth IEEE International Conference on Cognitive Informatics(第五届认知信息国际会议)

作者： Shengsheng Wang Xinying Wang Da-you Liu Qiangyuan Yu College of computer science and technology Key laboratory of symbolic computing and knowledge engineering of ministry of education Jilin University Changchun 130012China

ISBN: (纸本)1424404754

Moving objects databases are becoming more and more popular due to the increasing number of application domains that deal with moving entities. Continuous queries are important in moving objects databases. We summarize three types of continuous queries, but only two of them have been studied before. We proposed new algorithms to process the other two types of queries. Experiment results all show that our algorithms is excellent in monitoring accuracy, communication cost and CPU load balance.

关键词： Moving Database algorithms

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Operational semantics of the seal calculus

Operational semantics of the seal calculus

引用

4th IFIP TCI2 International Conference on Intelligent Information Processing, IIP 2006

作者： Jing, Zhang Li-Cui, Zhang De-Gui, Guo College of Computer Science and Technology Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education of China Jilin University Changchun 130012 China College of Communication Engineering Jilin University Changchun 130012 China

ISBN: (纸本)9780387446394

As a distributed process calculus with localities and mobility of computational entities, Seal calculus is playing an important role in expressing key features such as security and mobility of Internet programming directly. However, little implementation technique proposed for the calculus, partly due to the complication of inobile computation, which fusions three important techniques: concurrency, distribution and mobility at the same time. The abstract machine PSN for a distributed implementation of the Seal calculus is presented. In PSN the logical structure of a seal system and its physical distribution are separated which induces a more simple and clear implementation. Moreover, an operational semantics description of the Seal calculus based on PSN is given.

关键词： Calculations

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SLNN: A Neural Network for Fuzzy Neural Network's Structure Learning

SLNN: A Neural Network for Fuzzy Neural Network's Structure ...

引用

International Conference on Intelligent Systems Design and Applications (ISDA)

作者： Daxin Tian Yanheng Liu Jian Wang College of Computer Science and Technology Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University China

A novel structure learning algorithm for fuzzy neural networks (SLNN) is presented in this paper. The neurons of SLNN are created and adapted as online learning proceeds. The learning rule of SLNN is based on Hebbian learning and a kernel winner-take-all algorithm - KWTA. KWTA not only can let SLNN be able to learn from new data but also can prevent losing the knowledge which has been learned earlier. To obtain a concise fuzzy rule, a pruning algorithm is adopted in SLNN which doesn't disobey the basic design philosophy of fuzzy system. Simulations are performed on the primary benchmark: circle-in-the-square. Comparison with ARTMAP and BP neural network indicates that better performance is achieved

关键词： Neural networks Fuzzy neural networks Fuzzy systems Clustering algorithms Signal processing algorithms Computer networks Neurons Partitioning algorithms Learning Fuzzy control

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Research of Mobile IPv6 Application Based On Diameter Protocol

Research of Mobile IPv6 Application Based On Diameter Protoc...

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International Multi-Symposiums on Computer and Computational Sciences (IMSCCS)

作者： Da Wei Yanheng Liu Xuegang Yu Xiaodong Li College of Computer Science and Technology Key Laboratory of Symbolic Computation and Knowledge Engineering of Ministry of Education Jilin University China

The diameter protocol is recommended by IETF as AAA (authentication, authorization and accounting) protocol criterion for the next generation network. Because the IPv6 protocol will be widely applied in the intending all-IP network, mobile IPv6 application based on diameter protocol will play more important role in authentication, authorization and accounting. In this paper, the implementation of mobile node's authentication and authorization is presented with PANA (protocol for carrying authentication for network access) protocol. It is based on diameter protocol for the application expansion of mobile IPv6, which provides the supports to the basic AAA process of mobile IPv6 nodes and dynamic home agent distribution in the visited network and the secret key distribution. Finally, the correctness of this application expansion is testified with developing the design of protocol based on opendiameter

关键词： Access protocols Authentication Cryptographic protocols Authorization Network servers Application software IP networks Peer to peer computing Transport protocols Computer science

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A NEW POINT-BASED RENDERING METHOD FOR RAY TRACING

A NEW POINT-BASED RENDERING METHOD FOR RAY TRACING

引用

2006 International Conference on Machine Learning and Cybernetics(IEEE第五届机器学习与控制论坛)

作者： GUO-LIANG ZHOU YUN-JIE PANG ZHEN-HUA ZHANG YONG QUAN WEN-HUI LI Computer Graphics Laboratory College of Computer Science and Technology Jilin University Qianwei Key Laboratory for Symbolic Computation and Knowledge Engineering of Ministry of Education

In this paper a new point-based rendering method for ray tracing is presented. An oriented spherical patch that passes a surface point is used to approximate the vicinity of that *** this paper the spherical patch together with the surface point is called "Spherical Patch Point" (SPP). Due to property of curvature, SPP can achieve similar visual quality compared with previous methods with much fewer points. This paper defines new point attributes for the purpose of efficiently locating the intersection between incoming ray and ***, an algorithm of intersecting a ray with point geometry is proposed. The algorithm can achieve a higher rendering speed in comparison with previous methods. The presented technique deals well with shadow, reflection and refraction.

关键词： Point-based rendering Curvature Spherical patch Radius Ray tracing

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computing AND RAY TRACING POINT-BASED GEOMETRY

COMPUTING AND RAY TRACING POINT-BASED GEOMETRY

引用

2006 International Conference on Machine Learning and Cybernetics(IEEE第五届机器学习与控制论坛)

作者： YUN-JIE PANG BIN ZHOU YONG QUAN WEN-HUI LI Computer Graphics Laboratory College of Computer Science and Technology Jilin University Qianwei Key Laboratory for Symbolic Computation and Knowledge Engineering of Ministry of Education

In this paper a new technique for computing and ray tracing point based geometry is presented. It uses a novel point primitive that is called "Spherical Patch Point" (SPP) to approximate the vicinity of a surface point. Due to property of curvature, SPP can achieve similar visual quality compared with previous methods with much fewer primitives for the cost of a few additional bytes per point and thus makes a significant reduction in rendering time. During pre-process,important attributes are added to each SPP for the purpose of ray tracing. During rendering, an intersection algorithm different from previous ones has been demonstrated to get satisfied results. The proposed technique makes it possible to render high quality ray traced images with global illumination using SPPs. It offers a higher ray tracing speed in comparison with previous methods.

关键词： Points Curvature Sphere Radius Ray tracing

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