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1.
基于多Agent与CORBA的远程教育通信平台的研究与构建   总被引:2,自引:0,他引:2  
The distance learning based on distributing teaching involves technology question of coordination mutually between many roles.Agent is an entity which can act on his own and conforms himself with environment.Agent‘‘s ideology is fit for the inherent requirement of the distance learning system.For solving the problem about ditferent structure during Agents‘‘ communications,combining with the requirement of the distance learning system,in this paper,the model of distance education system based on CORBA and Multi-Agent has been put forward,which is distributing style and fit for the environment of Internet/Intranet.  相似文献   

2.
一个不确定性数据库模型及其语义   总被引:6,自引:0,他引:6  
In this paper,based on probabilistic and cognitive uncertainties,we set up an uncertain database model and presented the uncertain relational algebra ,and proved that the uncertain normal forms are closed under operations of the uncertain relational algebra. At last ,we studied the semantics of the uncertain relation.  相似文献   

3.
In mobile database systems,mobility of users has a significant impact on data replication.As a result,the various replica control protocols that exist today in traditional distributed and multidatabase environments are no longer suitable To solve this problem,a new mobile database replication scheme,the Transaction-Level Result-Set Propagation(TLRSP)model,is put forward in this paper,The conflict dectction and resolution strategy based on TLRSP is discussed in detail,and the implementation algorithm is proposed,In order to compare the performance of the TLRSP model with that of other mobile replication schemes,we have developed a detailde simulation model.Experimantal results show that the TLRSP model provides an effcient support for replicated mobile database systems by reducing reprocessing overhead and maintaining database consistency.  相似文献   

4.
多比例尺下的三维GIS细节层次可视化技术   总被引:3,自引:0,他引:3  
In this paper ,by investigating leve!yof detail in 3D GIS,we integrate generalization techniqueswith 3D visualization techniques on the basis of object oriented database. In order to improve the perfor-mance of database access ,we investigate the access structure based on modified reactive tree and analyzethe detailed method of representing level of detail. This approach visualizes 3I) object with object-orient-ed database and integrates generalization with 3I) visualization techniques ,3D G-IS is expected to achievebetter performance of query and photo-realistic visualization at multi-scale。  相似文献   

5.
Machine Learning is one of the key problems of Artificial Intelligence, and the agent learning has become an important branch of machine learning. One of the main characters of intelligent agent is that it can adapt to the unknown environment. The ability to learn is the key property of agent. Because the learning act of agent is dynamic and fuzzy, this paper uses the conception of Dynamic Fuzzy Logic (DFL)tl]. Based on DFL, this paper first presents two single-agent learning algorithms, namely, single-agent leaning algorithm based on DFL with immediate reward and single-agent learning algorithm based on DFL with mediate reward. Then the paper gives a multi-agent learning model based on DFL, namely a multi-agent learning model planned on a whole. Furthermore, this paper validates that the model is useful by an example.  相似文献   

6.
Most existing algorithms for identifying multi-model system are based on minimizing the square of bias between global outputs of the actual system and the identified model, but the resultant model lacks of robustness. In order to solve this problem, this paper considers some other algorithms in which local models are identified independently and presents a multi-model identification algorithm based on weighted cost function, which uses the idea of local weighted regression and local approximation while keeps the model structure of global identification algorithm. The result of application to a 300MW unit boiler superheater illustrates that the multi-model generated by the proposed algorithm has better trade-off between global fitting and local interpretation.  相似文献   

7.
Most existing algorithms for identifying multi-model system are based on minimizing the square of bias between global outputs of the actual system and the identified model,but the resultant model lacks of robustness.In order to solve this problem,this paper considers some other algorithms in which local models are identified independently and presents a multi-model identifica- tion algorithm based on weighted cost function,which uses the idea of local weighted regression and local approximation while keeps the model structure of global identification algorithm.The result of application to a 300MW unit boiler superheater illustrates that the multi-model generated by the proposed algorithm has better trade-off between global fitting and local interpretation.  相似文献   

8.
锅炉-汽轮机组的协调控制器整定   总被引:1,自引:0,他引:1  
房方  谭文  刘吉臻 《自动化学报》2005,31(2):291-296
A simple two-by-two model for a boiler-turbine unit is derived in this paper, which can capture the essential dynamics of the typical process. The coordinated controller is designed based on this model. A PID control structure and a tuning procedure are proposed. The example shows that the method is easy to use and can achieve an acceptable performance.  相似文献   

9.
A simple two-by-two model for a boiler-turbine unit is derived in this paper, which can capture the essential dynamics of the typical process. The coordinated controller is designed based on this model. A PID control structure and a tuning procedure are proposed. The example shows that the method is easy to use and can achieve an acceptable performance.  相似文献   

10.
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